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Home >> Ford >> 2024 >> Escape ST-Line Select >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System (Abs) And Stability Control (Diagnosis & Testing) >> Diagnosis And Testing >> Anti-Lock Brake System (ABS) and Stability Control >> Pinpoint Tests >> Pinpoint Test BP: Abs Module Communication Concern With GWM

Pinpoint Test BP: Abs Module Communication Concern With GWM

  1. Normal Operation and Fault Conditions 

    With the ignition ON, the GWM sends messages to the ABS module over the FD-CAN. If the ABS module does not receive these messages within the allotted time frame or if the messages contain invalid data, the module sets a DTC. This can be due to a GWM failure, a circuit failure on the network or an excessive load on the network. For information on the messages sent to the ABS module by the GWM, REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    ABS U0146:87 Lost Communication With Serial Data Gateway 'A': Missing Message This DTC sets when the ABS module does not receive any messages from the GWM within the allowed time.

    Possible Causes 

    • Network communication concern
    • GWM

  2. BP1 CHECK THE COMMUNICATION NETWORK

    • Ignition ON.

    • Press the Read Vehicle Information button to view the results of the modules communicating on the network.

    • Press Read Vehicle Information button to retrieve DTC's from the vehicle.
      NOTE: DTC's may be displayed from previous diagnostic actions.

    • Read the vehicle information.

    Does the GWM pass the Network Test? 

    Yes  RETRIEVE and RECORD all GWM DTC's. REFER to: Communications Network in the appropriate Module Communications Network article. If there are no DTC's in the GWM. GO to  BP2
    No  DIAGNOSE the scan tool does not communicate with the GWM. REFER to: Communications Network in the appropriate Module Communications Network article.

  3. BP2 RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE FOR THE LOST COMMUNICATION DTC (DIAGNOSTIC TROUBLE CODE)

    • Clear the ABS module DTC's.

    • Put the ABS module in sleep mode by performing the following steps:

      • With ALL doors closed, set the ignition from ON to OFF
      • Disconnect the diagnostic scan tool
      • Open the door, exit the vehicle and close the door
      • Wait a minimum of 90 seconds for the ABS module to enter sleep mode

    • Ignition ON.

    • Carry out the ABS module DTC's.

    • Retrieve and record the ABS module DTC.

    Are any of the DTC's listed in the DTC Fault Trigger Conditions table present and active in the ABS module? 

    Yes  GO to  BP3
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

  4. BP3 REVIEW THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST FOR VOLTAGE-RELATED DTCS

    • Review the results from the ABS module self-test.

    Is DTC U3003:16 or U3003:17 present? 

    Yes  For DTC U3003:16: GO to  BP1For DTC U3003:17: GO to  BP6
    No  GO to  BP4

  5. BP4 CHECK FOR GWM (GATEWAY MODULE A) DTCS

    • Carry out the GWM DTC's.

    Are any DTC's present? 

    Yes  DIAGNOSE the GWM DTC. REFER to: Communications Network in the appropriate Module Communications Network article.
    No  GO to  BP5

  6. BP5 CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN

    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 GWM or the ABS module. If recent service history is found:

      • Verify the correct replacement module was installed. HVBOM may be used to verify correct part fitment.
      • Verify the configuration of replacement module was correct. Re-configure the 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 concern is still present.

    Is the concern still present? 

    Yes  GO to  BP6
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

  7. BP6 CHECK FOR COMMUNICATION DTCS IN OTHER MODULES

    • Ignition ON.

    • Press Read Vehicle Information button to retrieve DTC's from the vehicle.
      NOTE: DTC's may be displayed from previous diagnostic actions.

    • Read vehicle information.

    Is DTC U0146:xx set in 1 or more modules in addition to the ABS module? 

    Yes  GO to  BP7
    No  GO to  BP8
    For all others: Test is complete and no faults were found.

  8. BP7 VERIFY GWM (GATEWAY MODULE A) OPERATION

    • Put the ABS module in sleep mode by performing the following steps:

      • With ALL doors closed, set the ignition from ON to OFF.

      • Disconnect the diagnostic scan tool.

      • Open the door, exit the vehicle and close the door.

      • Wait a minimum of 90 seconds for the ABS module to enter sleep mode.

    • Disconnect GWM connector C2431.

    • Disconnect ABS connector C135.

    • 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

    • Connect GWM connector C2431. Make sure the connector seats and latches correctly.

    • Connect ABS connector C135. Make sure the connector seats and latches correctly.

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

    Is the concern still present? 

    Yes  CHECK OASIS for any service articles: TSB, GSB, SSM or FSA. If no service articles address this concern, INSTALL a new GWM. REFER to: Gateway Module A (GWM) in the appropriate Module Communications Network article.
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

  9. BP8 VERIFY ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

    • Put the ABS module in sleep mode by performing the following steps:

      • With ALL doors closed, set the ignition from ON to OFF
      • Disconnect the diagnostic scan tool
      • Open the door, exit the vehicle and close the door
      • Wait a minimum of 90 seconds for the ABS module to enter sleep mode

    • Disconnect ABS module connector C135.

    • Disconnect GWM connector C2431.

    • Disconnect GWM connector.

    • 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

    • Connect GWM connector C2431. Make sure the connector seats and latches correctly.

    • Connect ABS connector C135. Make sure the connector seats and latches correctly.

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

    Is the concern still present? 

    Yes  CHECK OASIS for any 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, INSTALL a new EBB unit. REFER to: Electric Brake Booster (EBB) .
    ORDER a replacement ABS module and INCLUDE the RVC on the form. If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form. Generate RVC.
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
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