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Pinpoint Test J: U0401:00, U0401:82

WARNING: This page is about a different car, the 2022 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. Normal Operation and Fault Conditions 

    With the ignition ON, the PCM sends vehicle speed data messages to the GWM along the HS-CAN1. The GWM relays the messages to the RTM using the MS-CAN 1. If the vehicle speed data messages are invalid or faulted, the RTM sets a DTC and the TPMS warning indicator is illuminated.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    RTM U0401:00 Invalid Data Received from ECM/PCM A: No Sub Type Information This DTC sets in continuous memory if the vehicle speed message from the PCM is "invalid" or "faulted" instead of the actual vehicle speed data.
    RTM U0401:82 Invalid Data Received from ECM/PCM A: Alive/Sequence Counter Incorrect/Not Updated This DTC sets in continuous memory if the vehicle speed message from the PCM does not refresh.

    Possible Sources 

    • Network communication concern
    • GWM
    • PCM
    • RTM

  2. J1 CHECK THE RTM (RADIO TRANSCEIVER MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, carry out the RTM self-test.

    Is DTC U0146:00 also present? 

    Yes  DIAGNOSE DTC U0146:00 before diagnosing DTC U0401:00 or U0401:82, GO to Pinpoint Test H 
    No  GO to  J2

  3. J2 CHECK THE COMMUNICATION NETWORK

    • Ignition ON.

    • Using a diagnostic scan tool, carry out the Network Test.

    Does the GWM and the PCM pass the Network Test? 

    Yes  GO to  J3
    No  DIAGNOSE the GWM or the PCM does not respond to the diagnostic scan tool. REFER to: Communications Network

  4. J3 RECHECK THE RTM (RADIO TRANSCEIVER MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

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

    • Ignition OFF.

    • Ignition ON.

    • Test drive the vehicle for a minimum of 2 minutes at a speed greater than 33 km/h (20 mph).

    • Using a diagnostic scan tool, carry out the RTM self-test.

    Is DTC U0401:00 or U0401:82 present? 

    Yes  GO to  J4
    No  The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

  5. J4 RETRIEVE ANY DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE GWM (GATEWAY MODULE A)

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

    Are there any Diagnostic Trouble Codes (DTCs) present in the GWM? 

    Yes  DIAGNOSE the GWM Diagnostic Trouble Codes (DTCs). REFER to: Communications Network
    No  GO to  J5

  6. J5 RETRIEVE ANY DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE PCM (POWERTRAIN CONTROL MODULE)

    • Using a diagnostic scan tool, carry out the PCM KOEO self-test.

    Are there any Diagnostic Trouble Codes (DTCs) present in the PCM? 

    Yes  DIAGNOSE the PCM DTC. REFER to: Electronic Engine Controls - 1.5L REFER to: Electronic Engine Controls - 2.0L REFER to: Electronic Engine Controls - 2.5L .
    No  GO to  J6

  7. J6 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0146:XX OR U0447:XX SET IN OTHER MODULES

    • Using a diagnostic scan tool, carry out the self-test for all modules.

    • Retrieve and record the Continuous Memory Diagnostic Trouble Codes (CM DTCs) from all modules.

    Is DTC U0146:xx or U0447:xx set in 2 or more modules? 

    Yes  CHECK OASIS for any applicable Technical Service Bulletins (TSBs), GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no TSB exists for the concern, INSTALL a new GWM REFER to: Communications Network
    No  GO to  J7

  8. J7 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0401 OR U0401:XX SET IN OTHER MODULES

    • Using a diagnostic scan tool, carry out the self-test for all modules.

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

    Is DTC U0401 or U0401:xx set in 1 or more modules in addition to the RTM? 

    Yes  CHECK OASIS for any applicable Technical Service Bulletins (TSBs), GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no TSB exists for the concern, INSTALL a new PCM. Refer to the appropriate Removal and Installation procedure in the appropriate Electronic Engine Controls service information.
    No  The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
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