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Home >> Ford >> 2022 >> Mustang Mach 1 Premium, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 34 (Automatic Transmission External Controls - 7-Speed Automatic Transmission - Tr9070) >> Diagnosis And Testing >> External Controls >> Pinpoint Tests >> Pinpoint Test E: U0140

Pinpoint Test E: U0140

WARNING: This page is about a different variant/trim than selected.
  1. Refer to MODULE COMMUNICATIONS NETWORK for schematic and connector information.

    Normal Operation and Fault Conditions 

    The GSM and BCM communicate through messages sent over HS-CAN. The GSM will set a DTC when it has not received messages from the BCM for more than 5 seconds.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    GSM U0140:00 Lost Communication With Body Control Module: No Sub Type Information Sets in continuous memory in the GSM if data messages received from the BCM are missing for 5 seconds or longer.
    GSM U0422:00 Invalid Data Received From Body Control Module: No Sub Type Information Sets in continuous memory in the GSM if the BCM is reporting faults in key signals.

    Possible Sources 

    • Communication concern
    • Incorrect PMI
    • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
    • BCM

  2. E1 VERIFY THE SCAN TOOL COMMUNICATES WITH THE BCM (BODY CONTROL MODULE)

    • Connect the diagnostic scan tool.

    • Check that a vehicle session can be established using the scan tool.

    Can a vehicle session be established? 

    Yes  GO to  E2
    No  RESOLVE the BCM does not respond to the diagnostic scan tool concern. REFER to: Communications Network .

  3. E2 CHECK THE BCM (BODY CONTROL MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, CARRY OUT the BCM self-test.

    Are any diagnostic trouble codes (DTCs) present in the BCM? 

    Yes  RESOLVE those diagnostic trouble codes (DTCs) first. REFER to: Body Control Module (BCM) .
    No  GO to  E3

  4. E3 CHECK THE GSM (GEAR SHIFT MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, CARRY OUT GSM self-test.

    Are any non-network diagnostic trouble codes (DTCs) present in the GSM? 

    Yes  RESOLVE all non-network diagnostic trouble codes (DTCs) first. REFER to Diagnostic Trouble Code (DTC) Chart 
    No  GO to  E4

  5. E4 CHECK THE GWM (GATEWAY MODULE A) FOR DIAGNOSTIC TROUBLE CODES (DTCS)

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

    Are any diagnostic trouble codes present in the GWM? 

    Yes  REFER to: Communications Network .
    No  GO to  E5

  6. E5 RECHECK THE GSM (GEAR SHIFT MODULE) FOR DTC (DIAGNOSTIC TROUBLE CODE) U0140, U0422

    • Using a diagnostic scan tool, clear all diagnostic trouble codes from the GSM.

    • Road test the vehicle.

    • Using a diagnostic scan tool, CARRY OUT the GSM self-test.

    Is DTC U0140 and/or U0422 present? 

    Yes  GO to  E6
    No  The system is operating correctly at this time. The DTC may have set due to high network traffic or an intermittent fault condition.

  7. E6 CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERNS

    NOTE: If new modules were installed prior to the DTC being set, the module configuration can 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 BCM or GSM. If recent service history is found:

      • verify correct replacement module was installed

        • HVBOM may be used to verify correct part application

      • 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

    Were any causes of a communication concern found in the vehicle service history? 

    Yes  PROGRAM or INSTALL a new module as necessary.
    No  GO to  E7

  8. E7 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect the BCM and all related in-line electrical connectors.

    • Using a good light source, inspect all  disconnected electrical connectors for the following:

      • corrosion - install new connector or terminal and clean the module pins
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary
      • spread terminals - install new terminals as necessary

    • Reconnect the BCM and all related in-line electrical connectors. Make sure they seat and latch correctly.

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

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable TSB. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSB addresses this concern, INSTALL a new BCM. Refer to BODY CONTROL MODULE (BCM)
    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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