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Pinpoint Test Y: Abs (Anti-Lock Brake System) Module DTC (Diagnostic Trouble Code) C0051 Steering Angle Concerns With The PSCM (Power Steering Control Module) - Mechanical

  1. 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 DTC.

    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 DTC, 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 DTC are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active DTC before diagnosing any historic DTC.

    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 DTC 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 

    DTC Description Fault Trigger Condition
    ABS C0051:23 Steering Wheel Position Sensor: Signal Stuck Low This DTC sets if the steering wheel position signal from the PSCM is unchanged for a predetermined amount of time.
    ABS C0051:27 Steering Wheel Position Sensor: Signal Rate Of Change Above Threshold This DTC sets if steering angle signal message sent from the PSCM indicates a higher rate of change than other ABS module inputs.
    ABS C0051:28 Steering Wheel Position Sensor: Signal Bias Level Out Of Range/Zero Adjustment Failure This DTC sets when the ABS module detects the absolute value of the measured steering wheel position is greater than 720 degrees or if the calculated steering angle offset is greater than 15 degrees.
    ABS C0051:41 Steering Wheel Position Sensor: General Checksum Failure This DTC sets if the PSCM steering angle message contains invalid information, the message checksum contains an error or the message counter contains an error.
    ABS C0051:54 Steering Wheel Position Sensor: Missing Calibration This DTC sets if the steering angle center position is not found and the speed or time limit is exceeded. This DTC automatically clears as soon as the center position is found.
    ABS C0051:62 Steering Wheel Position Sensor: Signal Compare Failure This DTC sets when the ABS module detects a time-out failure, a quality factor failure, a plausibility failure of the yaw or active yaw signals or a plausibility failure of the wheel speed data. When this occurs, the steering angle center cannot be determined to be valid and the system triggers the steering angle center learning process.
    ABS C0051:64 Steering Wheel Position Sensor: Signal Plausibility Failure This DTC sets when the ABS module detects the difference between the steering wheel angle signal and the calculated reference signal is too high or if the steering wheel angle sensor does not match other stability control sensor inputs (yaw rate, lateral acceleration, longitudinal acceleration, roll rate).
    ABS C0051:67 Steering Wheel Position Sensor: Signal Incorrect After Event This DTC sets when the ABS module detects the center position of the steering wheel cannot be determined after 30 seconds of driving at a speed between 14.4 km/h (9 mph) and 48 km/h (30 mph).
    ABS C0051:85 Steering Wheel Position Sensor: Signal Above Allowable Range This DTC sets when the ABS module detects the absolute value of the calculated steering wheel angle is greater than a predetermined threshold.
    ABS C0051:86 Steering Wheel Position Sensor: Signal Invalid This DTC sets when the PSCM sends the defective status message due to an internal failure.
    ABS C006B:00 Stability System Active Too Long: No Sub Type Information This DTC sets when the ABS module detects the ABS, ESC or RSC function has been active for longer than the various sensors indicate is necessary.

    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

  2. Y1 CHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DTC (DIAGNOSTIC TROUBLE CODE) S

    • Ignition ON, engine OFF.

    • Carry out the ABS self-test.

    Are DTCs C0051:xx or C006B:xx present and active in the ABS module? 

    Yes  GO to  Y2
    No  If other DTCs are present in the ABS module, DIAGNOSE the ABS module DTCs. REFER to: Anti-Lock Brake System (ABS) and Stability Control . If there is an " ABS false activation" symptom present, GO to  Y3 For all other ABS symptoms, DIAGNOSE the ABS module DTCs. REFER to: Anti-Lock Brake System (ABS) and Stability Control
    If there are no DTCs present in the ABS module or any ABS symptoms present, No fault found. DISCONTINUE this test.

  3. Y2 GUIDED DIAGNOSTIC QUESTION

    • Carry out all diagnostics for any ABS module DTCs or ABS symptoms before continuing with this pinpoint test.

    Have diagnostics been carried out for all ABS module DTCs or ABS symptoms? 

    Yes  GO to  Y3
    No  DIAGNOSE all ABS module DTCs and ABS symptoms. REFER to: Anti-Lock Brake System (ABS) and Stability Control .

  4. Y3 VERIFY DRIVING CONDITIONS WHEN TRACTION CONTROL WARNING INDICATOR ILLUMINATED

    • Ask the customer if the vehicle was towing something such as a camper, a trailer, or another vehicle when the traction control warning indicator illuminated.

    Was the vehicle towing something such as a camper, a trailer, or another vehicle when the traction control warning indicator illuminated? 

    Yes  GO to  Y4
    No  GO to  Y5

  5. Y4 VERIFY TOWING EQUIPMENT INSTALLED CORRECTLY

    • Review towing equipment (load leveling bars, hitch, etc.) with customer, verify equipment is installed correctly, lubricated as required, etc.

    • Verify towing electrical connections are seated and latched correctly.

    • Once equipment is adjusted and verified to be in good working order:

    • Ignition OFF.

    • Ignition ON, engine OFF.

    • Clear the ABSDTCs.

    • Drive the vehicle, attempt to replicate the customer's driving conditions.

    • Carry out the ABS self-test.

    Is DTC C006B:xx or C0051:xx present and active in the ABS module? 

    Yes  GO to  Y5
    No  The towing equipment adjustments have resolved the ABS C0051:xx DTC and the repair is complete.

  6. Y5 VERIFY OTHER DRIVING CONDITIONS

    • Ask the customer if the vehicle was driving in heavy cross-winds, on gravel roads, or other non-standard road conditions.

    • Ignition OFF.

    • Ignition ON.

    • Clear the ABSDTCs.

    • Drive the vehicle, attempt to replicate the customer's driving conditions.

    • Carry out the ABS self-test.

    Is DTC C006B:xx or C0051:xx present and active in the ABS module? 

    Yes  GO to  Y6
    No  The system is operating correctly at this time and the repair is complete.

  7. Y6 VERIFY STEERING WHEEL IS CENTERED AND ALIGNMENT IS CORRECT

    • Verify the steering wheel is centered and the alignment is correctly set.

    Is the steering wheel centered and the alignment correctly set? 

    Yes  GO to  Y7
    No  ADJUST the front toe, REFER to: Front Toe Adjustment . GO to  Y7

  8. Y7 CHECK THE STEERING GEAR ATTACHMENT POINTS

    • Verify the steering gear is properly attached to the frame or sub-frame. REFER to: Steering Gear .

    • Verify the steering gear-to-steering shaft joint is correctly installed. REFER to: Steering Gear .

    Are the steering gear attachments properly installed? 

    Yes  GO to  Y8
    No  REINSTALL or RECONNECT the steering gear attachment points. REFER to: Steering Gear . GO to  Y8

  9. Y8 RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DTC (DIAGNOSTIC TROUBLE CODE) S

    • Ignition ON, engine OFF.

    • Clear the ABSDTCs.

    • Drive the vehicle, attempt to replicate the customer's driving conditions.

    • Carry out the ABS self-test.

    Is DTC C006B:xx or C0051:xx present and active in the ABS module? 

    Yes  GO to Pinpoint Test Z 
    No  The vehicle is operating correctly at this time. The repairs and adjustments made in this pinpoint test resolved the issue.
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