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Pinpoint Test Ah: Abs Module DTC C0051 Steering Angle Concerns With The PSCM - Electrical

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

    Refer to Power Steering Controls for schematic and connector information.

    Normal Operation and Fault Conditions 

    REFER to: Power Steering - System Operation and Component Description 

    Description 

    • Description 
    • ABS module DTC s 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 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 Diagnostic Trouble Codes (DTCs) 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 PSCM and the associated electrical wiring which can affect the steering wheel angle comparison between the ABS module and the PSCM.

    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 Causes 

    • PSCM Internal Failure DTC s
    • PSCM Network Lost Communication DTC s
    • PSCM Network Invalid Data DTC s
    • Starter, alternator, charging system voltage levels low
    • Steering wiring harness, grounds or connectors
    • Non-steering wiring harness, grounds or connectors

  2. AH1 GUIDED DIAGNOSTIC QUESTION

    • Perform pinpoint test T.

    Has pinpoint test T been carried out? 

    Yes  GO to  AH2
    No  GO to Pinpoint Test AG 

  3. AH2 VERIFY BATTERY VOLTAGE LEVELS

    • Inspect the battery connections and battery wiring. Refer to BATTERY, MOUNTING AND CABLES .

      • Verify the connections are clean and tight.
      • Verify the connections and cables are free from corrosion, cuts, and other damage.

    • Inspect the generator connections and generator wiring. Refer to GENERATOR AND REGULATOR .

      • Verify the connections are clean and tight.
      • Verify the connections and cables are free from corrosion, cuts, and other damage.
      • Verify the battery and charging system are providing the correct voltage to the vehicle.

    Are the battery, generator and wiring in good condition, and is the system providing the correct voltage? 

    Yes  GO to  AH3
    No  DIAGNOSE and REPAIR the battery or charging system. REFER to Diagnosis And Testing . GO to  AH3

  4. AH3 RETRIEVE THE PSCM (POWER STEERING CONTROL MODULE) DTCS

    • Ignition ON.

    • Using a scan tool, clear the PSCMDTC s.

    • Wait at least 90 seconds for all modules to shut down.

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

    • Using a scan tool, carry out the PSCM self test.

    Does the PSCM respond to the diagnostic scan tool? 

    Yes  GO to  AH4
    No  GO to Pinpoint Test BL 

  5. AH4 CHECK THE PSCM (POWER STEERING CONTROL MODULE) FOR INTERNAL FAULTS OR PROGRAMMING FAULTS

    • Using a scan tool, carry out the PSCM self test.

    (This question does not apply to Diagnostic Trouble Codes (DTC's) in history.) 

    Are any of the following DTC s currently present and active in the PSCM ; C102D, C1B00, C200B, C200C, C200D, P07AE, U2100, U2011, or U3000? 

    Yes  DIAGNOSIS the PSCMDTC. GO to the PSCM Diagnostic Trouble Code (DTC) Chart .
    No  GO to  AH5

  6. AH5 CHECK THE PSCM (POWER STEERING CONTROL MODULE) FOR COMMUNICATION FAULTS OR INVALID DATA FAULTS

    • Using the results from the previous step, determine if any lost communication, invalid data, or voltage DTC s are present in the PSCM.

      • Lost communication DTC s indicate the PSCM is missing messages from another module within a certain expected time frame.
      • Invalid data DTC s indicate the PSCM received messages from another module but the data in the message is outside the expected content.
      • Voltage DTC s indicate the PSCM received voltages outside the expected range.

    Are any of the DTC s from the above table either currently or previously present in the PSCM ' 

    Yes  If communication or invalid data DTC s are present in the PSCM without any voltage DTC s : GO to  AH10. If ANY voltage DTC s are present in the PSCM : GO to  AH6
    No  GO to  AH6

  7. AH6 CHECK THE PSCM (POWER STEERING CONTROL MODULE) FOR VOLTAGE FAULTS

    • Using the results from the previous step, determine if any voltage DTC s are present in the PSCM.

    Is DTC U3001 or U3003 either currently or previously present in the PSCM ' 

    Yes  GO to  AH7
    No  The PSCM circuit is working correctly at this time and is not a root cause of the ABS module DTC or steering sensor concern. GO to  AH10

  8. AH7 PSCM (POWER STEERING CONTROL MODULE) CIRCUIT VERIFICATION - FUSES

    Are the fuses fully seated, undamaged and not open? 
    Yes  GO to  AH8
    No  REINSTALL or INSTALL new fuses as necessary. GO to  AH8

  9. AH8 PSCM (POWER STEERING CONTROL MODULE) CIRCUIT VERIFICATION - POWER WIRING AND CONNECTIONS

    • NOTE: Refer to Power Steering Controls for schematic and connector information.

      Visually check both power wiring and ground wiring for chaffing or pinching on other components.

    • Verify the power and ground connections are clean, fully seated or tightened, and free of corrosion.

    Are the power and ground wiring and connections free from damage and correctly seated and tightened? 

    Yes  GO to  AH9
    No  REPAIR or INSTALL new connectors or wiring as necessary. GO to  AH9

  10. AH9 PSCM (POWER STEERING CONTROL MODULE) CIRCUIT VERIFICATION - POWER AND GROUND INTERNAL CIRCUIT CHECK

    • NOTE: This test verifies whether there is unseen, internal damage to the wiring harness.

      Make sure the front wheels are on the ground and the vehicle is not being supported by other means.

      • Make sure the front tires are clean and dry.
      • Make sure the ground under the front tires is clean and dry.

    • Take the following measurement while turning the steering wheel back and forth, lock to lock, continuously at 1 revolution per second.

      • Measure the voltage between:

      Positive Lead Measurement / Action Negative Lead
      CBATTERY POSITIVE
      GFD832156Courtesy of FORD MOTOR COMPANY
      		 CBATTERY NEGATIVE

    • Using a scan tool, view the PSCM battery voltage or main voltage PID.

    • Compare the measured battery voltage with the PID display.

    Do the measured battery voltage and the PID display voltage differ by more than 1. 5 volts? 

    Yes  INSTALL a new PSCM wiring harness. REPEAT this pinpoint test step to verify the new harness is also free from internal damage.
    Yes  If the communication concerns are still present: 
    GO to  AH10
    Yes  If the voltage concerns are resolved: 
    GO to  AH12
    No  The PSCM power and ground circuits are working correctly at this time and are not root cause of the ABS module DTC.
    No  If communication or invalid data DTCs are NOT present in the PSCM : 
    GO to  AH12
    No  If communication or invalid data DTCs are present in the PSCM : 
    GO to  AH10

  11. AH10 PSCM (POWER STEERING CONTROL MODULE) CIRCUIT VERIFICATION - COMMUNICATION CONNECTIONS

    • Disconnect PSCM connector.

    • Disconnect all applicable in-line electrical connectors as indicated above.

    • Inspect all disconnected electrical connectors for the following:Inspect all disconnected electrical connectors for the following:

      • Pushed-out pins, loose pins, spread terminals, water ingress or corrosion.
      • Missing or loose latches, broken or cracked connector housings.

    • Inspect the HS-CAN wiring for:

      • Pinched or cut wiring under brackets, air cleaner boxes, battery trays, engine pulleys, etc.
      • Loose wiring harness anchoring locations in the engine compartment.

    • Repair connectors or wiring as required.

    • Connect PSCM connector. Make sure the connector seats and latches correctly.

    • Connect all disconnected, in-line electrical connectors. Make sure the connectors seat and latch correctly.

    • Ignition ON.

    • Using a scan tool, clear the PSCMDTC.

    • Wait at least 90 seconds for all modules to shut down.

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

    • Using a scan tool, carry out the PSCM self test.

    (This question does not apply to Diagnostic Trouble Codes (DTC's) in history.) Are there any lost communication or invalid data DTCs currently present and active in the PSCM ' 

    Yes  GO to  AH11
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues. GO to  AH12

  12. AH11 PSCM (POWER STEERING CONTROL MODULE) CIRCUIT VERIFICATION - COMMUNICATION WIRING

    • Ignition OFF.

    • Visually Inspect the HS-CAN wiring is not pinched, chaffed, chewed by animals, damaged near or under the battery tray or other nearby components.

    • Disconnect GWM connector.

    Is the resistance less than 3 ohms? 

    Yes  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues. GO to  AH12
    No  REPAIR the circuit. GO to  AH12

  13. AH12 CHECK FOR ABS (ANTI-LOCK BRAKE SYSTEM) MODULE AND PSCM (POWER STEERING CONTROL MODULE) DTCS

    • Connect GWM connector. Make sure the connector seats and latches correctly.

    • Ignition ON.

    • Using a scan tool, clear the PSCMDTC s.

    • Ignition OFF.

    • Wait at least 90 seconds for all modules to shut down.

    • Using a scan tool, carry out the ABS module self test.

    • Using a scan tool, carry out the PSCM self test.

    Are any lost communication or invalid data DTC s currently present and active in the PSCM or are any C006B:xx or C0051:xx DTC s currently present and active in the ABS module? NOTE: This question does not apply to DTC s in history. 

    Yes  The PSCM wiring harness circuit evaluation is complete and not contributing to the ABS module DTC. GO to the service information corresponding to the module name in the remaining lost communication or invalid data codes to continue the diagnostics.
    No  The PSCM wiring harness circuit adjustments or repairs have resolved the lost communication, invalid data or ABS module steering angle sensor concerns with the PSCM.
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