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Pinpoint Test J : U0100, U0401

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

  1. J1 CHECK THE COMMUNICATION NETWORK

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

    Does the PCM pass the Network Test? 

    Yes  GO to  J2.
    No  DIAGNOSE the PCM does not communicate with the diagnostic scan tool, REFER to Module Communications Network .

  2. J2 CHECK THE ABS CMDTCs

    • Using a diagnostic scan tool, carry out the ABS module self-test.
    • Using a diagnostic scan tool, clear the ABS module DTCs.
    • Ignition OFF.
    • Ignition ON.
    • Wait 10 seconds.
    • Using a diagnostic scan tool, carry out the ABS module self-test.
    • Retrieve and record the ABS module DTCs.

    Does DTC U0100 or U0401 return? 

    Yes  GO to  J3.
    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.

  3. J3 REVIEW THE RECORDED DTCs FROM THE ABS MODULE SELF-TEST

    • Review the recorded DTCs from the ABS module self-test.

    Is DTC B1676 present? 

    Yes  GO to Pinpoint Test A .
    No  GO to  J4.

  4. J4 RETRIEVE THE DTCs FROM THE PCM SELF-TEST

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

    Is DTC P0562 or P0563 present? 

    Yes  DIAGNOSE the PCM DTCs. REFER to Electronic Engine Controls .
    No  GO to  J5.

  5. J5 CHECK FOR DTC U0100, U0100:XX, U0401 OR U0401:XX SET IN OTHER MODULES

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

    Is DTC U0100, U0100:XX, U0401 or U0401:XX set in 1 or more modules in addition to the ABS module? 

    Yes  CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new PCM. REFER to Electronic Engine Controls .
    No  CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module .
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