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Home >> Ford >> 2022 >> E-Transit Van Cargo Extended >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Auxiliary Brake System >> Diagnosis And Testing >> Auxiliary Brake System - Vehicles With: Trailer Brake Control >> Pinpoint Tests >> Pinpoint Test I: U0140

Pinpoint Test I: U0140

  1. Refer to TRAILER/CAMPER ADAPTER for schematic and connector information.

    Normal Operation and Fault Conditions 

    With the ignition ON, the BCM sends messages to the TBM over the HS-CAN. If the TBM does not receive these messages within the specified time frame, the TBM sets a DTC. This can be due to a BCM failure, a circuit failure on the HS-CAN or an excessive load on the network. For information on the messages sent to the TBM by the BCM, REFER to: Auxiliary Brake System - Vehicles With: Trailer Brake Control - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    • DTC Fault Trigger Conditions 
    • TBM U0140 -- Lost Communication With Body Control Module (GEM)

      • This DTC sets in continuous memory and on-demand if the TBM does not receive any network messages from the BCM.

    Possible Sources 

    • Wiring, terminals or connectors
    • BCM
    • TBM

  2. I1 CHECK THE COMMUNICATION NETWORK

    • Ignition ON.

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

    Does the BCM pass the Network Test? 

    Yes  DIAGNOSE the BCM does not communicate with the diagnostic scan tool. REFER to: COMMUNICATIONS NETWORK .
    No  GO to  I2

  3. I2 CHECK THE TBM (TRAILER BRAKE CONTROL MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)

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

    • Clear the TBM Diagnostic Trouble Codes (DTCs).

    • Ignition OFF.

    • Ignition ON.

    • Wait at least 10 seconds for all modules to wake up and prove out.

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

    • Record the TBM Diagnostic Trouble Codes (DTCs).

    Is DTC U0140 retrieved again? 

    Yes  GO to  I3
    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.

  4. I3 REVIEW THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE TBM (TRAILER BRAKE CONTROL MODULE) SELF-TEST

    • Review the recorded Diagnostic Trouble Codes (DTCs) from the TBM self-test.

    Is DTC B1317 or B1318 present in the TBM? 

    Yes  For DTC B1317, GO to Pinpoint Test D  For DTC B1318, GO to Pinpoint Test E 
    No  GO to  I4

  5. I4 RETRIEVE THE DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE BCM (BODY CONTROL MODULE) SELF-TEST

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

    Is DTC U3003:16 or U3003:17 present in the BCM? 

    Yes  DIAGNOSE the BCM Diagnostic Trouble Codes (DTCs). REFER to: BODY CONTROL MODULE (BCM) .
    No  GO to  I5

  6. I5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0140: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 (CMDTCs) from all modules.

    Is DTC U0140:XX set in 1 or more modules in addition to the TBM? 

    Yes  CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new BCM. REFER to: BODY CONTROL MODULE (BCM) .
    No  CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new TBM. REFER to: Trailer Brake Control Module (TBM) .
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