Lincoln Navigator: Power Steering / Power Steering. Diagnosis and Testing

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• There are 2 power sources for the PSCM , the high current power steering fuse, and the low current power steering fuse. Refer to the wiring diagrams to review the PSCM circuit for both the high current and low current fuse locations as well as the associated power and ground wiring. Open power steering fuse can occur when the power or ground wiring is shorted against another component or water intrusion in the respective connectors or connections.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to the following diagnostic concerns:
• DTC U0131 set in a module other than the PSCM
• The symptom "PSCM Does Not Communicate With The Diagnostic Scan Tool"
• The symptom "Open PSCM Fuse(s)"

This test DOES NOT apply to any other DTC or symptom.

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).
• This DTC sets in other modules when those modules do not receive messages from the PSCM within a certain time limit. This can occur if the vehicle wiring harness wires or connections, connectors or pins between the PSCM and other modules are loose or damaged. This DTC also sets if the PSCM is not communicating on the vehicle CAN due to an internal fault condition or a low battery state of charge. Consult the Possible Causes list for additional information.

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM , wiring harness, and connections are working correctly. This test also verifies the existence of a low battery state of charge.

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• HS-CAN concern
• PSCM

Visual Inspection and Pre-checks

• Make sure the vehicle battery terminals and cables are free of any corrosion and other contaminants.
• Make sure the vehicle battery terminals are tightened to their correct torque specifications.
• Make sure all BJB and high-current BJB fuses related to the PSCM are OK.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Workshop Manual diagnostics for another module not communicating with the PSCM must be carried out prior to entering this test. REFER to Section 100-00 for an index of all DTC charts and follow the diagnostics for the DTCs present.

Normal Operation and Fault Conditions

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to vehicles equipped with an EPAS system (gear or column mounted) ONLY.
• This test applies to all PSCM U3000:xx Diagnostic Trouble Codes (DTCs) EXCEPT U3000:4B.
• This test does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Diagnostic Aids

Diagnostic Aids

• For DTC U3000:42, steering assist is not affected and there is no warning in the message center. The PSCM may transmit an invalid steering angle message over the HS-CAN .
• For DTC U3000:49, during the ignition cycle the DTC initially sets, the PSCM enters limp home mode and steering assist is gradually reduced until the PSCM enters manual mode. The PSCM sends a message to the IPC to display the STEERING ASSIST FAULT SERVICE REQUIRED in the message center.
• During the next ignition cycle after DTC U3000:49 sets, If the PSCM is not already in manual mode the PSCM removes steering assist and enters manual mode. The module also transmits an invalid steering angle message over the HS-CAN and sends a message to the IPC to display the STEERING ASSIST FAULT SERVICE REQUIRED in the message center.
• For DTC U3000:96, DO NOT INSTALL A NEW PSCM AS PART OF THE REPAIR FOR PSCM DTC U3000:96.
• 2 key cycles may be required to clear the DTC after completing the Reset the Power Steering Control Module (PSCM) service function.

If a damaged bellows boot(s) was discovered during inspection and this pinpoint test DOES NOT lead to the installation of a new EPAS gear or bellows boot(s), then ADDRESS the cause of the damaged boot(s) before returning the vehicle to the customer.

DTC Fault Trigger Conditions

Possible Sources

• PSCM reset required
• Heat shield missing
• Damaged or torn bellows boot(s)
• Damaged or cracked EPAS gear housing
• Steering gear internal failure
• Incorrect EPAS gear installed
• Heavy loads on the EPAS gear
• Excessive ambient temperatures

NOTE: Customers may report an intermittent power steering concern that may not replicate during a test drive session. TSB , SSM or Diagnostic Trouble Codes (DTCs) may exist indicating the likely root cause. Retrieve all Diagnostic Trouble Codes (DTCs) for the vehicle, as well as TSB , SSM .

Normal Operation and Fault Conditions

there are 2 power sources for the PSCM , the high current power steering fuse, and the low current power steering fuse. Refer to the wiring diagrams to review the PSCM circuit for both the high current and low current fuse locations as well as the associated power and ground wiring. Open power steering fuse can occur when the power or ground wiring is shorted against another component or water intrusion in the respective connectors or connections.

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If lost communication or voltage Diagnostic Trouble Codes (DTCs) exist in the PSCM or other vehicle modules, possible source can be fuse(s) or wiring, terminals, or connectors
• If Diagnostic Trouble Codes (DTCs) other than lost communication or voltage exist in the PSCM or other vehicle modules, the possible source can be an internal fault in the PSCM or other vehicle modules.
• If no Diagnostic Trouble Codes (DTCs) are present in the PSCM or other vehicle modules, the concern could be addressed by a service article such as a TSB , GSB , SSM , or FSA .

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• PSCM internal fault
• Internal fault in other module(s) on the CAN

• Ignition ON.

• Using a diagnostic scan tool, retrieve the Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules.

Normal Operation and Fault Conditions

Description

Description

• Due to various steering gear hardware versions, a new PSCM must be calibrated or flashed with the correct level of operating software and matching calibration files.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC C1110 only.

This test does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM DTC C1110 is present and provide diagnostics if DTC C1110 is currently present and active in the PSCM .

DTC Fault Trigger Conditions

Possible Sources

• PSCM not configured
• PSCM configuration not complete

Normal Operation and Fault Conditions

Description

Description

• Rotating the steering wheel excessively when the ignition is OFF can cause the PSCM to lose the steering angle center position. This symptom corrects itself after the vehicle is driven straight for at least 152 meters (500 ft), with little to no steering wheel torque input. Once the PSCM re-learns the center position, the EPAS system returns to normal operation.

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to the following diagnostic concerns:
• Steering wheel moves slightly when the engine is started and vehicle begins to move

This test DOES NOT apply to any other DTC or symptom.

Diagnostic Strategy

Diagnostic Strategy

• Verify the vehicle has been driven for at least 152 meters (500 ft), with little to no steering wheel torque input.

Possible Sources

• PSCM has lost the steering angle center position

Normal Operation and Fault Conditions

Description

Description

• EPAS steering gears are not filled with power steering fluid.
• Only HPAS gears are filled with power steering fluid.
• Only HPAS gears can leak power steering fluid.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to the following diagnostic concerns:
• Steering gear appears to be leaking fluid

This test DOES NOT apply to any other DTC or symptom.

Pinpoint Test Purpose

Pinpoint Test Purpose

• To provide diagnostic direction regarding external fluids leaking onto the EPAS steering gear and components.

Possible Sources

• Engine coolant
• Engine oil
• Transmission fluid
• Brake fluid
• Fluid from nearby reservoir bottles

• Consult the VIN and associated steering components to verify if the steering system is electric or hydraulic assist.
  • If there are hydraulic hoses connected to the steering gear, the steering system is hydraulic assist.
  • If there are no hydraulic hoses connected to the steering gear, the steering system is electric assist.

Normal Operation and Fault Conditions

Description

Description

• Excessive steering wheel free play is a condition in which there is too much steering wheel movement before the front wheels move. The EPAS system is designed to compensate for some steering wheel free play, however a small amount of steering wheel free play is considered normal.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to the following diagnostic concerns:
• Excessive steering wheel play

This test DOES NOT apply to noise, binding, sticking, returnability, drift, pull, or wander.

Symptom Definition

Symptom Definition

• Excessive steering wheel play is a condition in which there is too much steering wheel rotation before the front wheels turn, such that a driver can feel they do not clearly understand where the front wheel position is.

Pinpoint Test Purpose

Pinpoint Test Purpose

• This pinpoint evaluates the steering wheel, steering column, tie rod, and steering gear mounting joint conditions.

If a damaged bellows boot(s) was discovered during inspection and this pinpoint test DOES NOT lead to the installation of a new EPAS gear or bellows boot(s), then ADDRESS the cause of the damaged boot(s) before returning the vehicle to the customer.

Possible Sources

• Steering column shaft U-joints
• Loose, damaged or worn inner or outer tie rods
• Steering gear internal failure

Normal Operation and Fault Conditions

Description

Description

• The steering wheel can vibrate or shake as well as resist turning into the next lane when the turn signals are not used to change lanes. This may be a normal operation of the Lane Keeping Assist feature.
• .

REFER to: Lane Keeping System - System Operation and Component Description (419-07 Lane Keeping System, Description and Operation).

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to the following diagnostic concerns:
• Steering wheel vibrates or resists turning

This test DOES NOT apply to any other DTC or symptom.

Diagnostic Strategy

Diagnostic Strategy

• Determine if the vehicle is equipped with the Lane Keeping Assist feature and educate the customer how the feature is activated, de-activated and properly used. Verify the vibration and turning resistance is no longer present when the Lane Keeping Assist feature is de-activated.

• Refer to the following sources of information on the PTS website:
• Owner's Literature - REFER to DRIVING AIDS
• Owner's Literature, Quick Reference Guide - REFER to FUNCTION
• Lane Keeping Reference Guide (all vehicles)

Possible Sources

• Normal operation of the Lake Keeping System

Normal Operation and Fault Conditions

Description

Description

• Before continuing with the diagnostic procedures, compare the vehicle steering feel/returnability with a like vehicle and confirm there is a concern present. If the feel or returnability matches the comparison vehicle there is no fault. If the feel or returnability does not match the comparison vehicle continue with the diagnosis.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies concerns with binding steering, sticky steering or returnability only.

This test DOES NOT apply to noise, wander, drift, pull, off-center, or steering wheel play concerns.

Symptom Definition

Symptom Definition

• Poor returnability and sticky steering is used to describe the poor return of the steering wheel to center after a turn or steering correction is completed.

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify whether the binding condition is due to low voltage, steering knuckles, steering column dash seals or boots, nearby shrouds or the steering gear.

If a damaged bellows boot(s) was discovered during inspection and this pinpoint test DOES NOT lead to the installation of a new EPAS gear or bellows boot(s), then ADDRESS the cause of the damaged boot(s) before returning the vehicle to the customer.

Possible Sources

• Under inflated or mismatched tires
• Alignment
• Binding suspension components
• Binding steering gear
• Binding steering gear bearings
• Binding steering column shaft dash panel seal
• Binding lower steering column shaft coupling or U-joint
• Outer tie-rod ends
• Inner tie rods
• Loose, worn or damaged steering linkage
• Steering gear internal failure

Normal Operation and Fault Conditions

Steering Fault Service Now

Steering Fault Service Now

• This message appears when a condition has been detected requiring the PSCM to disable the system (remove assist) to help prevent the system from sustaining any possible damage. This message (and related symptom) may be cleared when the ignition is cycled and may not be present at the time of diagnosis or may not clear until the condition is repaired.
• This message appears if a condition exists (high friction for example) putting extra load on the EPAS gear. Steering assist remains for the current ignition cycle. If the ignition is turned OFF and then back ON, STEERING FAULT SERVICE NOW appears in the message center and steering assist is removed until the condition is repaired.

Steering Assist Fault Service Required

Steering Assist Fault Service Required

• This message appears when a condition has been detected in the EPAS system requiring the PSCM to disable the system (remove assist) to help prevent the system from sustaining any possible damage. This message ( and related symptom) may be cleared when the ignition key is cycled and may not be present at the time of diagnosis.
• This message appears if a condition exists has been detected in the EPAS system requiring the PSCM to immediately reduce steering assist, gradually reduce assist or disable assist completely to help prevent the system from sustaining any possible damage. This message ( and related symptom) may be cleared when the ignition key is cycled and may not be present at the time of diagnosis.

Steering Loss Stop Safely

Steering Loss Stop Safely

• This message appears when a condition has been detected in the EPAS system requiring the PSCM to disable the system (remove assist) to help prevent the system from sustaining any possible damage. This message ( and related symptom) cannot be cleared until the condition is repaired.

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Possible Sources

• Diagnostic Trouble Codes (DTCs) present in the PSCM

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the ground circuits of the EPAS system and sets the appropriate DTC when a circuit error is detected.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U3009:1B Control Module Ground "B": Circuit Resistance Above Threshold only. It not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• This test verifies the PSCM wiring harness ground connections are OK.

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors

Normal Operation and Fault Conditions

Description

Description

• Front end noises while driving straight involve parts which rotate continuously while the road wheels are rotating. This is typically not caused by a steering gear.
• Wheel hub bearings can produce noise after achieving 56 km/h (35 mph) while driving straight if they are worn.
• Noises can also be caused by loose or un-retained parts affected by wind.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to the following diagnostic concerns:
• Noises occurring from the from of the vehicle while driving straight on smooth roads

This test DOES NOT apply to any other DTC or symptom.

Diagnostic Strategy

Diagnostic Strategy

• To visually check for obvious parts that may be damaged within parts that are in motion during this drive event, followed up by Chassis Ears usage to further define where the noise source may be while steering (turning the steering wheel) during this drive event.

Pinpoint Test Purpose

Pinpoint Test Purpose

• To search for the components contributing to steering noises during this drive event and determine if the resulting components are defective or the noise is a normally occurring noise for this vehicle type.

• If a damaged bellows boot(s) was discovered during inspection and this pinpoint test DOES NOT lead to the installation of a new EPAS gear or bellows boot(s), ADDRESS the damaged boot(s) before returning the vehicle to the customer.

Possible Sources

• Possible rotating sources:
• Axle shafts or halfshafts
• Carrier bearing (noise is typically felt through the console)
• Drive shafts
• Transfer case assembly (if equipped)
• Wheel hub and wheel bearings (typically higher speeds)
• Possible Wind Sources:
• Air dams
• Heat shields
• Radiator ducts or shields
• Wheel well splash shields

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the ground circuits of the EPAS system and sets the appropriate DTC when a circuit error is detected.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U3008:1B Control Module Ground "A": Circuit Resistance Above Threshold only. It not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• This test verifies the PSCM wiring harness ground connections are OK.

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors

Normal Operation and Fault Conditions

Description

Description

• When the battery voltage to the PSCM is greater than 10 volts with the ignition ON and there are no Diagnostic Trouble Codes (DTCs) present, the PSCM runs a self-test of the system software. If an error is detected, a DTC is set and the EPAS enters into a limited operation mode.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U202B In-Use Application Signing Key only. It not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify PSCM DTC U3001 is present and investigate if the PSCM wiring is the reason for the momentary loss of power. This test verifies the PSCM fuses, PSCM wiring harness power and ground connections are working correctly, as well as the battery and charging system.

DTC Trigger

DTC Trigger

• This DTC sets when the PSCM internal self tests detect a software internal error. Consult the DTC Index for additional information if needed.

DTC Fault Trigger Conditions

Possible Sources

• Incorrect files flashed onto PSCM
• PSCM internal failure
• PSCM

Normal Operation and Fault Conditions

Description

Description

• The EPAS system is designed to compensate for some steering issues (drift, pull, wander, etc.). However, if the steering issue is severe enough, the condition or symptom may become noticeable to the driver.
• The system starts compensating when vehicle speed exceeds 40 km/h (25 mph) and the vehicle is traveling straight. The system compensates on any road crown condition; however, some amount of pull is present during, and shortly after, quick lane transitions. After driving straight on a constant road crown with both hands on the steering wheel for at least 45 seconds, the pull condition can be assessed. The system does not compensate when turning at low speeds. For the system to compensate, the driver's hands must remain on the steering wheel.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to steering drift or pull only.

This test DOES NOT apply to noise, binding, sticking, returnability, off-center, or steering wheel play concerns.

Symptom Definition

Symptom Definition

• Pull occurs when the vehicle feels like it is consistently pulling to the right, or consistently pulling to the left. Vehicle tends to want to pull or drift to one side but not both sides of the vehicle.
• Steering drift is the tendency of the vehicle to drift from the intended path with hands off the steering wheel.

Pinpoint Test Purpose

Pinpoint Test Purpose

• The purpose of this pinpoint test is to evaluate if steering drift or pull is occurring. If it is, then you will be directed to section 204-00 to perform the drift pull pinpoint test.
• This does not address Steering Wheel Off Center concerns, for which the steering wheel is at an angle when driving straight on a level road. See Steering Wheel Off Center Pinpoint test for Steering Wheel Off Center concerns.

If a damaged bellows boot(s) was discovered during inspection and this pinpoint test DOES NOT lead to the installation of a new EPAS gear or bellows boot(s), then ADDRESS the cause of the damaged boot(s) before returning the vehicle to the customer.

Possible Sources

• Alignment
• Tire(s)
• Steering gear mounts
• Steering column shaft U-joints
• Steering column
• Suspension components
• Steering gear

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM is self monitoring and performs self tests at specific intervals (initial power up, power down, during normal operation, ect.) Each self test requires the voltage supply to the PSCM to be at or above a specific level (above 6 volts, above 9 volts, between 10 and 17 volts, ect.) for the test to take place. If one or more of the self tests should fail, the module sets one or more Diagnostic Trouble Codes (DTCs).

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U2014 only. This test does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

DTC Trigger

DTC Trigger

• These Diagnostic Trouble Codes (DTCs) set when the PSCM has detected a failure in the motor position sensor, the motor current sensor or the CAN . These Diagnostic Trouble Codes (DTCs) do not set a warning indicator or a message, they are for informational purposes only and indicate a possible fault in the hardware. If the fault sets again, the PSCM sets the appropriate DTC and warning indicator.

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify if any other PSCM Diagnostic Trouble Codes (DTCs) are present along with DTC U2014:XX.

Diagnostic Aids

Diagnostic Aids

• These Diagnostic Trouble Codes (DTCs) are for informational purposes only. DO NOT install a new EPAS unit or PSCM as a repair for these Diagnostic Trouble Codes (DTCs. Steering functionality is not affected and the driver should not observe any change in steering behavior.

DTC Fault Trigger Conditions

Possible Sources

• EPAS gear internal failure

Visual Inspection and Pre-checks

• This DTC sets when the PSCM internal self tests detect a software or hardware internal error. This can be to internal faults in the PSCM or from water getting inside the PSCM from damaged or cracked housings, or torn bellows boots.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM monitors the HS-CAN when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0557 Invalid Data Received from the FCIM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To direct the diagnosis to the module and associated circuit sending the faulty or unknown information in the messages.

Diagnostic Aids

Diagnostic Aids

• For additional information on the messages sent to the PSCM from the FCIM module, refer to the Network Message List in Section 211-02 of the workshop manual.
• DTC U0557:00 indicates a concern with the lane information sent from the FCIM . The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCM DTC U0557:00.

DTC Fault Trigger Conditions

Possible Sources

• HS-CAN concern
• FCIM
• This DTC sets when the PSCM does not receive the FCIM messages within a certain time frame. This can occur if the FCIM wiring harness or electrical connectors are loose or damaged, or if the vehicle battery state of charge levels are low. Consult the DTC Index for additional information if needed.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the HS-CAN messages when the ignition has been on for more than 5 seconds, the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the FCIM , REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0256 Lost Communication with the FCIM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the FCIM and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U0256:00.
• DTC U0256:00 indicates a possible failure of the HS-CAN which can be due to a circuit fault in the HS-CAN , the PSCM wiring harness or a FCIM concern.

DTC Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• FCIM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the HS-CAN messages when the ignition has been on for more than 5 seconds, the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the TBM , REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0137 Lost Communication with the TBM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the TBM and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U0137:00.
• DTC U0122:00 indicates a possible failure of the HS-CAN which can be due to a circuit fault in the HS-CAN , the PSCM wiring harness or a TBM concern.

DTC Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• TBM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM monitors the HS-CAN messages when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0403 Invalid Data Received from the TCCM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To direct the diagnosis to the module and associated circuit sending the faulty or unknown information in the messages.

Diagnostic Aids

Diagnostic Aids

• For additional information on the messages sent to the PSCM from the TCCM module, refer to the Network Message List in Section 211-02 of the workshop manual.
• DTC U0403:00 indicates a concern with the TCCM . The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCM DTC U0403:00.

DTC Fault Trigger Conditions

Possible Sources

• HS-CAN concern
• One or more steering components installed incorrectly
• TCCM concern

Visual Inspection and Pre-checks

• This DTC sets when the PSCM does not receive the TCCM messages within a certain time frame. This can occur if the TCCM wiring harness or electrical connectors are loose or damaged, or if the vehicle battery state of charge levels are low. Consult the DTC Index for additional information if needed.
• Refer to Steering GSB for additional connector and wiring inspection tips.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the FD-CAN messages when the ignition has been on for more than 5 seconds, the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the VDM , REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0122 Lost Communication with the VDM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the VDM and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U0122:00.
• DTC U0122:00 indicates a possible failure of the FD-CAN which can be due to a circuit fault in the FD-CAN , the PSCM wiring harness or a VDM concern.

DTC Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• VDM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM monitors the HS-CAN messages when the ignition has been on for more than 5 seconds, the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the TCCM

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0102 Lost Communication with the TCCM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the TCCM and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U0102:00.
• DTC U0102:00 indicates a possible failure of the HS-CAN which can be due to a circuit fault in the HS-CAN , the PSCM wiring harness or a TCCM concern.
• When the selectable drive mode is changed, the PSCM modifies the steering characteristics of the EPAS system. The presence of this DTC prevents the selectable drive mode system (if equipped) from activating. If set while the vehicle is in a drive mode other than NORMAL, the PSCM defaults to NORMAL and the system is disabled.

DTC Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• TCCM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM monitors the HS-CAN when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0554 Invalid Data Received from the APIM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To direct the diagnosis to the module and associated circuit sending the faulty or unknown information in the messages.

Diagnostic Aids

Diagnostic Aids

• For additional information on the messages sent to the PSCM from the APIM module, refer to the Network Message List in Section 211-02 of the workshop manual.
• DTC U0554:00 indicates a concern with the lane information sent from the APIM . The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCM DTC U0554:00.
• The presence of DTC U0554:00 may prevent the trailer backup optional feature from activating. If the DTC sets during an backup event, the event may be terminated and the feature may be deactivated.

DTC Fault Trigger Conditions

Possible Sources

• HS-CAN concern
• APIM
• This DTC sets when the PSCM does not receive the APIM messages within a certain time frame. This can occur if the APIM wiring harness or electrical connectors are loose or damaged, or if the vehicle battery state of charge levels are low. Consult the DTC Index for additional information if needed.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM monitors the FD-CAN when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0416 Invalid Data Received from the VDM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To direct the diagnosis to the module and associated circuit sending the faulty or unknown information in the messages.

Diagnostic Aids

Diagnostic Aids

• For additional information on the messages sent to the PSCM from the VDM module, refer to the Network Message List in Section 211-02 of the workshop manual.
• DTC U0416:00 indicates a concern with the information sent from the VDM . The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCM DTC U0416:00.

DTC Fault Trigger Conditions

Possible Sources

• FD-CAN concern
• VDM
• This DTC sets when the PSCM does not receive the VDM messages within a certain time frame. This can occur if the VDM wiring harness or electrical connectors are loose or damaged, or if the vehicle battery state of charge levels are low. Consult the DTC Index for additional information if needed.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM monitors the HS-CAN2 when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U053C Invalid Data Received from the IPMB only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To direct the diagnosis to the module and associated circuit sending the faulty or unknown information in the messages.

Diagnostic Aids

Diagnostic Aids

• For additional information on the messages sent to the PSCM from the IPMB module, refer to the Network Message List in Section 211-02 of the workshop manual.
• DTC U053C:00 indicates a concern with the information sent from the IPMB . The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCM DTC U053C:00.

DTC Fault Trigger Conditions

Possible Sources

• HS-CAN2 concern
• IPMB
• This DTC sets when the PSCM does not receive the IPMB messages within a certain time frame. This can occur if the IPMB wiring harness or electrical connectors are loose or damaged, or if the vehicle battery state of charge levels are low. Consult the DTC Index for additional information if needed.

NOTE: DTC U0452:00 indicates a power mode message concern.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM monitors the HS-CAN when the ignition is ON for more than 5 seconds, the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.

Diagnostic Aids

Diagnostic Aids

• For additional information on the messages sent to the PSCM from the RCM module, refer to the Network Message List in Section 211-02 of the workshop manual.
• DTC U0452:00 indicates a yaw rate signal message concern. The module reporting this DTC is not the problem module. Do not install a new EPAS assembly if this DTC is set.
• The presence of DTC U0452:00 prevents the Lane Centering Assist (LCA) feature from activating ( if equipped). If set during a lane centering assist event, the event is terminated and the lane centering assist system is deactivated.

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• HS-CAN concern
• RCM

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM monitors the HS-CAN messages when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0423 Invalid Data Received from the IPC only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To direct the diagnosis to the module and associated circuit sending the faulty or unknown information in the messages.

Diagnostic Aids

Diagnostic Aids

• For additional information on the messages sent to the PSCM from the IPC module, refer to the Network Message List in Section 211-02 of the workshop manual.
• DTC U0423:00 indicates a concern with the IPC . The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCM DTC U0423:00.

DTC Fault Trigger Conditions

Possible Sources

• HS-CAN concern
• One or more steering components installed incorrectly
• IPC concern

Visual Inspection and Pre-checks

• This DTC sets when the PSCM does not receive the IPC messages within a certain time frame. This can occur if the IPC wiring harness or electrical connectors are loose or damaged, or if the vehicle battery state of charge levels are low. Consult the DTC Index for additional information if needed.
• Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• When a new EPAS gear is installed, the PSCM is blank and must be configured with the vehicle information. Configuration is checked during initial PSCM power up (ignition ON) with the voltage supply to the PSCM greater than 6 volts.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U2300 Central Configuration not complete only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verifyPSCM DTC U2300 is present and provide diagnostics if DTC U2300 is currently active in the PSCM .

Diagnostic Aids

Diagnostic Aids

• REFER to: Module Configuration - System Operation and Component Description (418-01A Module Configuration, Description and Operation).
  

DTC Fault Trigger Conditions

Possible Sources

• PSCM not configured
• PSCM configuration not complete

Normal Operation and Fault Conditions

Description

Description

• Noises over bumps and rough roads involve parts which move and contact during an up and down motion.
• Exterior front end noises when turning at slow speeds involve parts which move, rotate or make contact during a partial or full turn. Please note whether the vehicle has column mounted EPAS , steering gear mounted EPAS , or adaptive steering.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to the following diagnostic concerns:
• Noises occurring over bumps, rough roads, dips, depressions or when entering a driveway, slow speeds or during parking lot maneuvers.

This test DOES NOT apply to any other DTC or symptom.

Diagnostic Strategy

Diagnostic Strategy

• To visually check for obvious parts that may be damaged within parts that are in motion during this drive event, followed up by Chassis Ears usage to further define where the noise source may be while steering (turning the steering wheel) during this drive event.

Pinpoint Test Purpose

Pinpoint Test Purpose

• To search for the components contributing to steering noises during this drive event and determine if the resulting components are defective or the noise is a normally occurring noise for this vehicle type.

Possible Sources

• Engine or transmission mounts
• Front halfshaft and bearings (ting or ping metallic noise at slow speeds) (if equipped)
• Front shock brackets or strut mounts
• Heat shields
• Integrated front wheel ends (4x4 only)
• Internal or external steering gear stops
• Loose ball joint
• Loose exhaust heat shield, isolators or brackets
• Loose front brake calipers or pins
• Loose steering gear tie rods
• Loose steering gear mounts or bolts
• Springs, shocks, struts and bearings or bushings (most common)
• Stabilizer bar insulators or links
• Subframe or crossmember condition, mounts or fasteners
• Tires
• Upper or lower steering shaft

Normal Operation and Fault Conditions

Description

Description

• Interior cabin noises involve parts moving or contacting during a steering wheel turn or interior parts moving or contacting during steering column tilt or telescopic operations.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to the following diagnostic concerns:
• Noises occurring inside the cabin when turning the steering wheel

This test DOES NOT apply to any other DTC or symptom.

Diagnostic Strategy

Diagnostic Strategy

• To visually check for obvious parts that may be damaged within parts that are in motion during this drive event, followed up by Chassis Ears usage to further define where the noise source may be while steering (turning the steering wheel) during this drive event.

Pinpoint Test Purpose

Pinpoint Test Purpose

• To search for the components contributing to steering noises during this drive event and determine if the resulting components are defective or the noise is a normally occurring noise for this vehicle type.

Possible Sources

• Steering column shrouds
• Steering shafts and steering shaft joints
• Steering shaft boots or seals
• Clockspring (when lubricant on the clockspring is dry or drying)
• Steering column tilt or telescoping motor (if equipped)
• Shifter cables (if equipped)
• Column EPAS motor (if equipped)
• Adaptive front steering motor (if equipped)

Normal Operation and Fault Conditions

Description

Description

• Noises when accelerating or decelerating involve parts which move during an acceleration tip-in (pressing foot on gas pedal) or parts which move during deceleration tip-out (when taking foot off gas pedal). These noises are not typically associated with the steering gear.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to the following diagnostic concerns:
• Noises occurring during acceleration or deceleration which may occur with braking

This test DOES NOT apply to any other DTC or symptom.

Diagnostic Strategy

Diagnostic Strategy

• To visually check for obvious parts that may be damaged within parts that are in motion during this drive event, followed up by Chassis Ears usage to further define where the noise source may be while steering (turning the steering wheel) during this drive event.

Pinpoint Test Purpose

Pinpoint Test Purpose

• To search for the components contributing to steering noises during this drive event and determine if the resulting components are defective or the noise is a normally occurring noise for this vehicle type.

Possible Sources

• Steering shaft slip joints or lower input shaft (requires lubrication)
• Roll restrictor
• Powertrain mounts
• Engine to chassis wiring, tubes, brackets (loose or out of position)
• Exhaust heat shield (tinny rattle)
• Exhaust isolators and brackets
• Subframe mounts
• Halfshafts (if equipped)
• Mid-shaft bearing (right hand halfshaft)
• Caliper anchors, calipers or brake pads
• Top strut mount or bearings (if equipped)
• Lower control arm attachment to sub frame bushings and bolts
• Subframe mounts

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM monitors the HS-CAN messages when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0428 Invalid Data Received from the SASM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To direct the diagnosis to the module and associated circuit sending the faulty or unknown information in the messages.

Diagnostic Aids

Diagnostic Aids

• For additional information on the messages sent to the PSCM from the SASM module, refer to the Network Message List in Section 211-02 of the workshop manual.
• DTC U0428:00 indicates a concern with the SASM . The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCM DTC U0428:00.

DTC Fault Trigger Conditions

Possible Sources

• HS-CAN concern
• One or more steering components installed incorrectly
• SASM concern

Visual Inspection and Pre-checks

• This DTC sets when the PSCM does not receive the SASM messages within a certain time frame. This can occur if the SASM wiring harness or electrical connectors are loose or damaged, or if the vehicle battery state of charge levels are low. Consult the DTC Index for additional information if needed.
• Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

The PSCM calculates steering wheel rotation speed, angle and direction of rotation and sends the information to the ABS module over the FD-CAN . If the information is incorrect, invalid or corrupted, the ABS module sets one or more Diagnostic Trouble Codes (DTCs).

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to mechanical concerns with the PSCM resulting in ABS module DTC C006B:xx, ABS module DTC C0051:xx or false activation only.

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• This pinpoint test checks both the driving events and mechanical component conditions which can affect the steering wheel angle comparison between the ABS module and the PSCM .

Diagnostic Aids

Diagnostic Aids

• ABS module Diagnostic Trouble Codes (DTCs) C006B:xx and C0051:xx set when the comparison between the ABS module steering angle information and the PSCM steering angle information is outside of the expected range. Both mechanical and electrical components may cause this concern.

DTC Fault Trigger Conditions

Possible Sources

• Tire pressure
• Wheel speed sensor
• Incorrectly mounted RCM
• Network communication concern
• Incomplete or incorrect stability control sensor calibration
• Wheels and tires
• Front suspension components
• Steering system components
• RCM
• PSCM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• ABS module Diagnostic Trouble Codes (DTCs) C006B:xx and C0051:xx set when the comparison between the ABS module steering angle information and the PSCM steering angle information is outside of the expected range. Both mechanical and electrical components may cause this concern.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to electrical concerns with the PSCM resulting in ABS module DTC C006B:xx, ABS module DTC C0051:xx or ABS false activation only.

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• This pinpoint test checks both the PSCM and the associated electrical wiring which can affect the steering wheel angle comparison between the ABS module and the PSCM .

Possible Sources

• PSCM Internal Failure Diagnostic Trouble Codes (DTCs)
• PSCM Network Lost Communication Diagnostic Trouble Codes (DTCs)
• PSCM Network Invalid Data Diagnostic Trouble Codes (DTCs)
• Starter, alternator, charging system voltage levels low
• Steering wiring harness, grounds or connectors
• Non-steering wiring harness, grounds or connectors

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM monitors various inputs and outputs of the EPAS system in order to keep the system operating at peak capacity. Information provided by sensors (steering torque, vehicle speed, vehicle travel distance, ect.) are all compared to programmed and learned information. Likewise, outputs like the motor and steering rack (travel) are tested against programmed and learned information.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to the following diagnostic concerns:
• This test applies to PSCM DTC C102D High Friction Inside Power Steering only.

This test DOES NOT apply to any other DTC or symptom.

Pinpoint Test Purpose

Pinpoint Test Purpose

• This test verifies the presence of PSCM DTC C102D and determines if the cause is mechanical or electrical in nature.

Diagnostic Aids

Diagnostic Aids

• If DTC C102D sets, steering assist is unaffected during the current drive cycle but steering assist is removed starting at the next ignition cycle. The message center displays STEERING LOSS STOP SAFELY.

• If a damaged bellows boot(s) was discovered during inspection and this pinpoint test DOES NOT lead to the installation of a new EPAS gear or bellows boot(s), ADDRESS the damaged boot(s) before returning the vehicle to the customer.

DTC Fault Trigger Conditions

Possible Sources

• Steering gear internal failure

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the HS-CAN messages when the ignition has been on for more than 5 seconds, the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the PCM , REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0100 Lost Communication with the PCM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the PCM and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U0100:00.
• DTC U0100:00 indicates a possible failure of the HS-CAN which can be due to a circuit fault in the HS-CAN , the PSCM wiring harness or a PCM concern.

DTC Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• PCM

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the HS-CAN messages when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the ABS module, REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0121 Lost Communication with the ABS only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the ABS and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U0121:00.
• DTC U0121:00 indicates a possible failure of the HS-CAN which can be due to a circuit fault in the HS-CAN , the PSCM wiring harness or a ABS concern.
• The presence of DTC U0121:00 may prevent the optional steering features; active park assist, Lane Keeping Assist (LKA) and Lane Centering Assist (LCA) from activating. If the DTC sets during an assist event, the event is terminated and the assist feature is deactivated.

DTC Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• Network communication concern
• ABS module

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the HS-CAN messages when the voltage to the PSCM is greater than 9 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the BCM module, REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0140 Lost Communication with the BCM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the BCM and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U140:00.
• DTC U0140:00 indicates a possible failure of the HS-CAN , the PSCM wiring harness or a BCM concern.

DTC Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• Network communication concern
• BCM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: The serial data gateway module is also known as the GWM

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM monitors the HS-CAN messages when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the GWM module, REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0146 Lost Communication with serial data GWM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) ) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the GWM and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U146:00.
• DTC U0146:00 indicates a possible failure of the HS-CAN , the PSCM wiring harness or a GWM concern.
• The presence of DTC U0146:00 prevents the Evasive Steering Assist (ESA) feature from activating. If the DTC sets during an assist event, the event is terminated and the assist system is deactivated.

DTC Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• Network communication concern
• GWM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the HS-CAN when the ignition is ON for more than 5 seconds, the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the RCM module, REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0151 Lost Communication with RCM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the RCM and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U151:00.
• DTC U0151:00 indicates a possible failure of the HS-CAN which can be due to a circuit fault in the HS-CAN , the PSCM wiring harness or a RCM concern.
• The presence of DTC U0151:00 prevents the optional Lane Centering Assist (LCA) feature from activating. If the DTC sets during an assist event, the event is terminated and the assist system is deactivated.

DTC Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• Network communication concern
• RCM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the HS-CAN messages when the ignition has been on for more than 5 seconds, the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the IPC , REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0155 Lost Communication with the IPC only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the IPC and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U0155:00.
• DTC U0155:00 indicates a possible failure of the HS-CAN which can be due to a circuit fault in the HS-CAN , the PSCM wiring harness or a IPC concern.

DTC Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• IPC

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the HS-CAN messages when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the PAM module, REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0159 Lost Communication with the PAM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the PAM and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U159:00.
• DTC U0159:00 indicates a possible failure of the HS-CAN which can be due to a circuit fault in the HS-CAN , the PSCM wiring harness or a PAM concern.
• The presence of DTC U0159:00 prevents the active park assist system (if equipped) from activating. If set during an active park assist event, the event is terminated and the active park assist system is deactivated.

DTC Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• Network communication concern
• PAM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the HS-CAN messages when the ignition has been on for more than 5 seconds, the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the SCCM , REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0212 Lost Communication with the SCCM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the SCCM and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U0212:00.
• DTC U0212:00 indicates a possible failure of the HS-CAN which can be due to a circuit fault in the HS-CAN , the PSCM wiring harness or a SCCM concern.
• The presence of DTC U0212:00 prevents the lane keep assist function (if equipped) from activating. If set during an lane keeping event, the event is terminated and the lane keep assist system is deactivated.

DTC Fault Trigger Conditions

Possible Sources

• Fuse
• Wiring, terminals or connectors
• SCCM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the HS-CAN messages when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the IPMA module, REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U023A Lost Communication with the Image Processing Module A only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the IPMA and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U023A:00.
• DTC U023A:00 indicates a possible failure of the HS-CAN which can be due to a circuit fault in the HS-CAN , the PSCM wiring harness or a IPMA concern.
• The presence of DTC U023A:00 may prevent the optional steering features; Evasive Steering Assist (ESA), Lane Keeping Assist (LKA) and Lane Centering Assist (LCA) from activating. If the DTC sets during an assist event, the event is terminated and the assist feature is deactivated.

DTC Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• Network communication concern
• IPMA

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the HS-CAN messages when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the PCM module, REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0401 Invalid Data Received from the PCM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To direct the diagnosis to the module and associated circuit sending the faulty or unknown information in the messages.

Diagnostic Aids

Diagnostic Aids

• DTC U0401:00 indicates a concern with the PCM . The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCM DTC U0401:00.
• When this DTC is set, steering assist is reduced resulting in higher steering efforts during low speed maneuvers.

DTC Fault Trigger Conditions

Possible Sources

• PCM sensors or components
• PCM

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the HS-CAN messages when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the ABS module, REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0415 Invalid Data Received from ABS Control Module "A" only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To direct the diagnosis to the module and associated circuit sending the faulty or unknown information in the messages.

Diagnostic Aids

Diagnostic Aids

• Steering assist may be reduced if the vehicle speed signal is missing. The module may transmit an invalid steering angle message over HS-CAN if the angle offset from ABS module is missing.
• DTC U0415:00 or U0415:22 indicates a concern with the ABS . The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCM DTC U0415:00 or U0415:22.
• The presence of DTC U0415:00 or U0415:22 may prevent the optional steering features; active park assist, Lane Keeping Assist (LKA) and Lane Centering Assist (LCA) from activating. If the DTC sets during an assist event, the event is terminated and the assist feature is deactivated.

DTC Fault Trigger Conditions

Possible Sources

• HS-CAN concern
• One or more steering components installed incorrectly
• ABS module

NOTE: DTC U0422:00 indicates a power mode message concern.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM monitors the HS-CAN messages when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.

Diagnostic Aids

Diagnostic Aids

• For additional information on the messages sent to the PSCM from the BCM module, refer to the Network Message List in Section 211-02 of the workshop manual.
• DTC U0422:00 indicates a power mode message concern. The module reporting this DTC is not the problem module. Do not install a new EPAS assembly if this DTC is set.

DTC Fault Trigger Conditions

Possible Sources

• HS-CAN concern
• BCM

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the HS-CAN messages when the ignition has been on for more than 5 seconds, the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the APIM , REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0253 Lost Communication with the APIM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the APIM and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U0253:00.
• DTC U0253:00 indicates a possible failure of the HS-CAN which can be due to a circuit fault in the HS-CAN , the PSCM wiring harness or an APIM concern.

DTC Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• APIM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

Normal Operation and Fault Conditions

Description

Description

• The PAM uses input from several sensors and components to gather vehicle data, then sends this data to the PSCM . If the data is corrupted or invalid, the PAM sends out "invalid", "fault" or "unknown" instead of the actual sensor data.
• For additional information on the messages sent to the PSCM from the PAM module, REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U045A Invalid Data Received from the PAM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the presence of DTC U045A and identify the correct Workshop Manual section for diagnosing the DTC or concern

Diagnostic Aids

Diagnostic Aids

• DTC U045A:00 indicates a concern with the PAM . The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCM DTC U045A:00.
• The presence of DTC U045A:00 prevents the active park assist system (if equipped) from activating. If set during an active park assist event, the event is terminated and the active park assist system is deactivated.

DTC Fault Trigger Conditions

Possible Sources

• PAM sensors and components
• PAM

Normal Operation and Fault Conditions

Description

Description

• The IPMA uses input from several sensors and components to gather vehicle data, then sends this data to the PSCM . If the data is corrupted or invalid, the IPMA sends out "invalid", "fault" or "unknown" instead of the actual sensor data. For a list of the messages sent to the PSCM from the IPMA , REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U053B Invalid Data Received from the IPMA only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the presence of DTC U053B and identify the correct Workshop Manual section for diagnosing the DTC or concern

Diagnostic Aids

Diagnostic Aids

• DTC U053B:00 indicates a concern with the lane information sent from the IPMA . The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCM DTC U053B:00.
• The presence of DTC U053B:00 may prevent the optional features; Evasive Steering Assist (ESA) and Lane Centering Assist (LCA) from activating. If the DTC sets during an assist event, the event may be terminated and the assist feature may be deactivated.

DTC Fault Trigger Conditions

Possible Sources

• IPMA sensors and components
• IPMA

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the HS-CAN messages when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the SASM module, REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0126 Lost Communication with the SASM only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the SASM and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U0126:00.
• DTC U0126:00 indicates a possible failure of the HS-CAN which can be due to a circuit fault in the HS-CAN , the PSCM wiring harness or a SASM concern.

DTC Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• SASM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the MS-CAN messages when the ignition has been on for more than 5 seconds, the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the LCM - Rear "B", REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0252 Lost Communication with the LCM - Rear "B" only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the LCM - Rear "B" and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U0252:00.
• DTC U0252:00 indicates a possible failure of the MS-CAN which can be due to a circuit fault in the MS-CAN , the PSCM wiring harness or a LCM - Rear "B" concern.

DTC Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• LCM - Rear "B"

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• The PSCM monitors the HS-CAN2 messages when the ignition has been on for more than 5 seconds, the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
• For additional information on the messages sent to the PSCM from the IPMB , REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).
  

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U023B Lost Communication with the IPMB only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the IPMB and wiring harness.

Diagnostic Aids

Diagnostic Aids

• Do not install a new PSCM as part of the repair for a PSCM DTC U023B:00.
• DTC U023B:00 indicates a possible failure of the HS-CAN2 which can be due to a circuit fault in the HS-CAN2 , the PSCM wiring harness or a IPMB concern.

DTC Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Wiring, terminals or connectors
• IPMB

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM uses a thermistor to monitor the internal temperature of the EPAS gear. This DTC appearing by itself does not indicate a fault condition in the steering system. Diagnose all other EPAS Diagnostic Trouble Codes (DTCs) before diagnosing B1D23:4B.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC B1D23 Overheat Sensor only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• This test inspects the steering gear and the surrounding engine compartment for hot components, missing heat shields or a damaged steering gear housing creating an opening into the steering gear.
• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults.

Diagnostic Aids

Diagnostic Aids

• The PSCM reporting only DTC B1D23:4B does not indicate a fault in the PSCM . It indicates an over-temperature condition due to ambient conditions or a heavy load on the EPAS system. An example of a heavy load would be multiple parking lot maneuvers over a short duration of time with low tire pressure or towing for long distances followed by multiple parking maneuvers
• The thermistor used by the PSCM is calibrated for 80ºC (176ºF) and as ambient temperature decreases, so does the accuracy of the sensor. At room temperature and lower, the sensor is +/- 20ºC (68ºF).
• The presence of DTC B1D23:4B prevents the active park assist system (if equipped) from activating. If set during an active park assist event, the event is terminated and the active park assist system is deactivated.

DTC Fault Trigger Conditions

Possible Sources

• Heat shield missing
• Heavy loads on the EPAS gear
• Excessive ambient temperatures
• PSCM

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM monitors the voltage supplied by the 12 volt battery and charging system and sets the appropriate DTC when necessary.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U3003 Battery Voltage only. It does not apply to any other module except PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults.

Pinpoint Test Purpose

Pinpoint Test Purpose

• This test verifies the PSCM fuses in the BJB and the high current BJB are OK, the PSCM wiring harness power and ground connections are OK. The test also verifies the charging system and battery state of charge.

Diagnostic Aids

Diagnostic Aids

• For some instances the message center may display: STEERING ASSIST FAULT SERVICE REQUIRED. This does not indicate a concern with the PSCM if only DTC U3003:XX is present. The 12 volt battery health should be evaluated.
• The PSCM reporting only DTC U3003:16, U3003:17, U3003:18, U3003:19, U3003:68 or U3003:A2 does not indicate a concern with the PSCM . DO NOT install a new EPAS assembly or PSCM if one or more of these Diagnostic Trouble Codes (DTCs) is set.
• The presence of DTC U3003:16, U3003:17, U3003:18 or U3003:68 prevents the optional steering features; Active Park Assist, Lane Keeping Assist (LKA) and Lane Centering Assist (LCA) feature from activating. If the DTC sets during an assist event, the event is terminated and the assist feature is deactivated. The presence of one of these Diagnostic Trouble Code's may also result in heavier than usual steering efforts.
• When DTC U3003:16, U3003:18, U3003:19 or U3003:A2 is set, the PSCM reduces power steering assist to a predetermined current draw. If EPAS operation exceeds this current limit, the PSCM continues to reduce steering assist until the current draw is below the limit or until assist is removed completely.

DTC Fault Trigger Conditions

Possible Sources

• Fuses
• Wiring, terminals or connectors
• Charging system concern
• 12 volt Battery
• PSCM

Visual Inspection and Pre-checks

• Make sure the vehicle battery terminals and cables are free of any corrosion and other contaminants.
• Make sure the vehicle battery terminals are tightened to their correct torque specifications.
• Make sure all PSCM fuses in the BJB and high current BJB are OK.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

Description

Description

• When the ignition is set to OFF, the PSCM remains powered up for a short period of time to store data in memory. When the ignition is set to ON, the PSCM retrieves this information and if the information is missing or corrupted a DTC is set.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U3001:xx Control Module Improper Shutdown Performance only. It not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify PSCM DTC U3001:xx is present and investigate if the PSCM wiring is the reason for the momentary loss of power. This test verifies the PSCM fuses, PSCM wiring harness power and ground connections are working correctly, as well as the battery and charging system.

DTC Trigger

DTC Trigger

• This DTC sets after the PSCM experiences a momentary loss of vehicle voltage. Prior to shutting down, the PSCM stores data in memory, when the ignition is set to ON, the PSCM reads this data and if it is missing or corrupted, this DTC sets. Therefore, the presence of DTC U3001 means the loss of vehicle voltage occurred prior to the DTC being set. Consult the DTC Index for additional information if needed.

DTC Fault Trigger Conditions

Possible Sources

• Fuses
• Wiring, terminals or connectors
• 12 volt battery
• Charging system
• PSCM

Visual Inspection and Pre-checks

• Make sure the vehicle battery terminals and cables are free of any corrosion and other contaminants.
• Make sure the vehicle battery terminals are tightened to their correct torque specifications.
• Make sure all PSCM fuses in the BJB and High-Current BJB are OK.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

Normal Operation and Fault Conditions

Description

Description

• When a new EPAS gear is installed, the PSCM is blank and must be configured with the vehicle information. Configuration is checked during initial PSCM power up (ignition ON) with the voltage supply to the PSCM greater than 6 volts.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U2100 Initial Configuration not complete only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verifyPSCM DTC U2100:xx is present and provide diagnostics if DTC U2100:xx is currently active in the PSCM .

Diagnostic Aids

Diagnostic Aids

• REFER to: Module Configuration - System Operation and Component Description (418-01A Module Configuration, Description and Operation).
  

DTC Fault Trigger Conditions

Possible Sources

• PSCM not configured
• PSCM configuration not complete

Visual Inspection and Pre-checks

• This DTC is set if the complete PSCM configuration was not carried out or if the configuration fails.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• While the ignition is ON and the voltage supply to the PSCM is above 6 volts, the module monitors the motor inside the EPAS gear to calculate the relative and actual steering wheel angle. This value is transmitted to other modules over the HS-CAN .

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM Diagnostic Trouble Codes (DTCs) C1B00 only. IT DOES NOT apply to any other modules or Diagnostic Trouble Codes (DTCs).

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• Verify PSCM DTC C1B00:xx is present. Verify PSCM wiring harness and electrical connectors are in good condition.

Diagnostic Aids

Diagnostic Aids

• When DTC C1B00:62 is set, the PSCM removes steering assist, enters into manual mode and transmits an invalid steering angle message over the HS-CAN . The module also sends a message to the IPC to display POWER STEERING ASSIST FAULT in the message center.

• If a damaged bellows boot(s) was discovered during inspection and this pinpoint test DOES NOT lead to the installation of a new EPAS gear or bellows boot(s), ADDRESS the damaged boot(s) before returning the vehicle to the customer.

DTC Fault Trigger Conditions

Possible Sources

• Steering gear internal failure
• PSCM internal failure

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM continually monitors the steering shaft torque sensor when the ignition is ON and the voltage supply to the sensor is between 5.26 and 4.71 volts.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC C200B Steering Shaft Torque Sensor 1 only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify PSCM C200B:xx is present and provide diagnostics if DTC C200B:xx is currently present and active in the PSCM .

Diagnostic Aids

Diagnostic Aids

• During the ignition cycle that the DTC initially sets, the PSCM either enters reduced assist mode or steering assist is gradually reduced until the PSCM enters manual mode.
• During the next ignition cycle after the DTC sets, if the PSCM is not already in manual mode the PSCM removes steering assist and enters manual mode. The module also transmits an invalid steering angle message over the HS-CAN and sends a message to the IPC to display the STEERING ASSIST FAULT SERVICE REQUIRED in the message center.
• If a damaged bellows boot(s) was discovered during inspection and this pinpoint test DOES NOT lead to the installation of a new EPAS gear or bellows boot(s), then ADDRESS the damaged boot(s) before returning the vehicle to the customer.

DTC Fault Trigger Conditions

Possible Sources

• Torque sensor electrical connector loose or damaged
• Torque sensor wiring damaged
• Steering gear internal failure

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM continually monitors the steering shaft torque sensor when the ignition is ON and the voltage supply to the sensor is between 5.26 and 4.71 volts.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC C200C:xx Steering Shaft Torque Sensor 2 only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify PSCM C200C:xx is present and provide diagnostics if DTC C200C:xx is currently present and active in the PSCM .

Diagnostic Aids

Diagnostic Aids

• During the ignition cycle the DTC initially sets, the PSCM either enters reduced assist mode or steering assist is gradually reduced until the PSCM enters manual mode.
• During the next ignition cycle after the DTC sets, if the PSCM is not already in manual mode the PSCM removes steering assist and enters manual mode. The module also transmits an invalid steering angle message over the HS-CAN and sends a message to the IPC to display the STEERING ASSIST FAULT SERVICE REQUIRED in the message center.
• If a damaged bellows boot(s) was discovered during inspection and this pinpoint test DOES NOT lead to the installation of a new EPAS gear or bellows boot(s), then ADDRESS the damaged boot(s) before returning the vehicle to the customer.

DTC Fault Trigger Conditions

Possible Sources

• Torque sensor electrical connector loose or damaged
• Torque sensor wiring damaged
• Steering gear internal failure

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM continually monitors the motor position angle sensor when the ignition is ON and the voltage supply to the PSCM is above 5.46 volts.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC C200D Motor Rotation Angle Sensor only. It does not apply to any other module except PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verify PSCM C200D:xx is present and provide diagnostics if DTC C200D:xx is currently present and active in the PSCM .

Diagnostic Aids

Diagnostic Aids

• During the ignition cycle the DTC initially sets, the PSCM enters limp home mode. The PSCM sends a message to the IPC to display the STEERING ASSIST FAULT SERVICE REQUIRED in the message center.
• During the next ignition cycle after the DTC sets, if the concern is still present, the PSCM removes steering assist and enters manual mode. The module also transmits an invalid steering angle message over the HS-CAN and sends a message to the IPC to display the STEERING ASSIST FAULT SERVICE REQUIRED in the message center.
• If a damaged bellows boot(s) was discovered during inspection and this pinpoint test DOES NOT lead to the installation of a new EPAS gear or bellows boot(s), then ADDRESS the damaged boot(s) before returning the vehicle to the customer.

DTC Fault Trigger Conditions

Possible Sources

• Steering gear internal failure

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

Normal Operation and Fault Conditions

REFER to: Power Steering - System Operation and Component Description (211-02 Power Steering, Description and Operation).

Description

Description

• The PSCM monitors the MS-CAN when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U0553 Invalid Data Received from the LCM - Rear "B" only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To direct the diagnosis to the module and associated circuit sending the faulty or unknown information in the messages.

Diagnostic Aids

Diagnostic Aids

• For additional information on the messages sent to the PSCM from the LCM - Rear "B" module, refer to the Network Message List in Section 211-02 of the workshop manual.
• DTC U0553:00 indicates a concern with the information sent from the LCM - Rear "B". The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCM DTC U0553:00.

DTC Fault Trigger Conditions

Possible Sources

• MS-CAN concern
• LCM - Rear "B"
• This DTC sets when the PSCM does not receive the LCM - Rear "B" messages within a certain time frame. This can occur if the LCM - Rear "B" wiring harness or electrical connectors are loose or damaged, or if the vehicle battery state of charge levels are low. Consult the DTC Index for additional information if needed.

NOTE: When DTC U2016 is set, the PSCM remains in normal operation mode, but features such as Active Nibble Control, Pull-Drift Compensation, Lane Departure Warning, Lane Keep Assist, ect. are disabled.

Normal Operation and Fault Conditions

Description

Description

• When the battery voltage to the PSCM is greater than 10 volts with the ignition ON and there are no Diagnostic Trouble Codes (DTCs) present, the PSCM runs a self test of the system software. If an error is detected, a DTC is set and the EPAS enters into a limited operation mode.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to PSCM DTC U2016 Control Module Main Software only. It does not apply to any other module except the PSCM .

DTC Diagnostic Strategy

DTC Diagnostic Strategy

• If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose

• To verifyPSCM DTC U2016:xx is present and provide diagnostics if DTC U2016:xx is currently active in the PSCM .

Diagnostic Aids

Diagnostic Aids

• During the ignition cycle the DTC U2016 initially sets, the PSCM either enters limp home mode and steering assist is gradually reduced until the PSCM enters manual mode. The PSCM sends a message to the IPC to display STEERING ASSIST FAULT SERVICE REQUIRED in the message center.

• During the next ignition cycle after DTC U2016:47 sets, if the concern is still present, the PSCM removes steering assist and enters manual mode. The module also transmits an invalid steering angle message over the HS-CAN and sends a message to the IPC to display the STEERING ASSIST FAULT SERVICE REQUIRED in the message center.
• When DTC U2016:47 is set, the PSCM remains in normal operation mode, but all steering features; Active Nibble Control, Pull-Drift Compensation, Evasive Steering Assist (ESA), Lane Departure Warning (LDW), Lane Keep Assist (LKA) and Lane Centering Assist (LCA) may be disabled.
• When DTC U2016:48 is set, the PSCM remains in normal operation mode, but all steering features: Active Nibble Control, Pull-Drift Compensation, Evasive Steering Assist (ESA), Lane Departure Warning (LDW), Lane Keep Assist (LKA) and Lane Centering Assist (LCA) may be disabled.

DTC Fault Trigger Conditions

Possible Sources

• PSCM internal failure

Visual Inspection and Pre-checks

• This DTC sets when the PSCM internal self tests detect a software internal error. Consult the DTC Index for additional information if needed.

Normal Operation and Fault Conditions

Description

Description

• The EPAS system is designed to compensate for some steering issues (drift, pull, wander, etc.). However, if the steering issue is severe enough, the condition or symptom may become noticeable to the driver.
• The system starts compensating when vehicle speed exceeds 40 km/h (25 mph) and the vehicle is traveling straight. The system compensates on any road crown condition; however, some amount of pull is present during, and shortly after, quick lane transitions. After driving straight on a constant road crown with both hands on the steering wheel for at least 45 seconds, the pull condition can be assessed. The system does not compensate when turning at low speeds. For the system to compensate, the driver's hands must remain on the steering wheel.

Pinpoint Test Applicability

Pinpoint Test Applicability

• This test applies to steering wander only.

This test DOES NOT apply to noise, binding, sticking, returnability, off-center, steering wheel play, drift or pull concerns.

Symptom Definition

Symptom Definition

• Wander is the tendency of the vehicle to require frequent, random left and right steering wheel corrections to maintain a straight path down flat smooth roads.

Pinpoint Test Purpose

Pinpoint Test Purpose

• The purpose of this pinpoint test is to evaluate if steering wander is occurring. If it is, then you will be directed to section 204-00 to perform the wander pinpoint test.
• This does not address Steering Wheel Off Center concerns, for which the steering wheel is at an angle when driving straight on a level road. See Steering Wheel Off Center Pinpoint test for Steering Wheel Off Center concerns.

If a damaged bellows boot(s) was discovered during inspection and this pinpoint test DOES NOT lead to the installation of a new EPAS gear or bellows boot(s), then ADDRESS the cause of the damaged boot(s) before returning the vehicle to the customer.

Possible Sources

• Alignment
• Tire(s)
• Steering gear mounts
• Steering column shaft U-joints
• Steering column
• Suspension components
• Steering gear