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Pinpoint Test I: DTC (Diagnostic Trouble Code) U0131:00

WARNING: This page is about a different car, the 2023 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to MODULE COMMUNICATION NETWORK for schematic and connector information.

    Normal Operation and Fault Conditions 

    REFER to: Lane Keeping System - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    IPMA U0131:00 Lost Communication With Power Steering Control Module 'A': No Sub Type Information A continuous memory DTC that sets in the IPMA if messages received from the PSCM are missing through GWM.

    Possible Sources 

    • Communication network concern
    • PSCM (integral to the steering gear)
    • IPMA concern
    • GWM concern

  2. I1 VERIFY THE CUSTOMER CONCERN

    • Ignition ON.

    • Verify there is an observable symptom present.

    Is there an observable symptom present? 

    Yes  GO to I2 
    No  CLEAR the DTC. The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

  3. I2 CHECK THE COMMUNICATION NETWORK

    • Using a diagnostic scan tool, perform a network test.

    Does the PSCM pass the network test? 

    Yes  GO to I3 
    No  REFER to: Controller Area Network (CAN) Module Communications Network . REFER to: Ethernet Module Communications Network .

  4. I3 PERFORM THE IPMA (IMAGE PROCESSING MODULE A) SELF-TEST

    • Using a diagnostic scan tool, perform the IPMA self-test.

    Are any non-network Diagnostic Trouble Codes (DTCs) present? 

    Yes  DIAGNOSE all non-network Diagnostic Trouble Codes (DTCs). REFER to Diagnostic Trouble Code (DTC) Chart 
    No  GO to I4 

  5. I4 PERFORM THE PSCM (POWER STEERING CONTROL MODULE) SELF-TEST

    • Using a diagnostic scan tool, perform the PSCM self-test.

    Are any Diagnostic Trouble Codes (DTCs) present? 

    Yes  DIAGNOSE all non-network Diagnostic Trouble Codes (DTCs). REFER to: Power Steering .
    No  GO to I5 

  6. I5 PERFORM THE GWM (GATEWAY MODULE A) SELF-TEST

    • Using a diagnostic scan tool, perform the GWM self-test.

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to: Controller Area Network (CAN) Module Communications Network . REFER to: Ethernet Module Communications Network .
    No  GO to I6 

  7. I6 RECHECK THE IPMA (IMAGE PROCESSING MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, clear the IPMA Diagnostic Trouble Codes (DTCs).

    • Ignition OFF.

    • Ignition ON.

    • Wait 10 seconds.

    • Retrieve the Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules.

    • Check the IPMA Diagnostic Trouble Codes (DTCs).

    Is DTC U0131:00 still present? 

    Yes  GO to I7 
    No  The system is operating correctly at this time. The DTC may have set due to high network traffic or an intermittent fault condition.

  8. I7 CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN

    NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during the PMI, or the PMI may not have been carried out.

    • CHECK the vehicle service history for recent service actions related to the PSCM or IPMA. If recent service history is found:

      • verify correct replacement module was installed

        • HVBOM may be used to verify correct part fitment

      • verify the configuration of replacement module was correct

        • re-configure module using as-built data if prior configuration is suspect

      • verify the module was not obtained from a like vehicle and installed into customer vehicle

        • return the swapped module to source vehicle and obtain new replacement module

    • Operate the system and determine if the observable symptom is still present.

    Is the observable symptom still present? 

    Yes  GO to I8 
    No  The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

  9. I8 CHECK FOR CORRECT PSCM (POWER STEERING CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all PSCM connectors.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the PSCM connectors. Make sure they seat and latch correctly.

    • Operate the system to determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, REFER to: Power Steering
    (211-02 Power Steering, Diagnosis and Testing)..
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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