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Pinpoint Test CI: 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 the Network Message Chart in article 206-09, Description and Operation in the service information.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    ABS U0146:00 Lost Communication With Serial Data Gateway 'A': No Sub Type Information 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. CI1 CHECK THE COMMUNICATION NETWORK

    • Ignition ON.

    • Using a diagnostic scan tool, carry out the network test.

    • Using a diagnostic scan tool, retrieve the DTC s from the vehicle.
      NOTE: DTC s may be displayed from previous diagnostic actions.

    Does the GWM pass the network test? 

    Yes  DIAGNOSE the GWMDTC s. REFER to: Controller Area Network (CAN) Module Communications Network . If there are no GWMDTC s, GO to  CI2
    No  DIAGNOSE the GWM does not communicate with the diagnostic scan tool. REFER to: Controller Area Network (CAN) Module Communications Network .

  3. CI2 RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DTC (DIAGNOSTIC TROUBLE CODE) S

    • CLEAR the ABSDTCs.

    • 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 self-test.

    Are any of the DTC s listed in the Fault Trigger Conditions Table retrieved again? 

    Yes  GO to  CI3
    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. CI3 CHECK FOR VOLTAGE DTC (DIAGNOSTIC TROUBLE CODE) S IN THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE

    • Review the recorded DTC s from the ABS module self-test.

    Is DTC U3003:16 or U3003:17 present? 

    Yes  For DTC U3003:16, GO to Pinpoint Test A  For DTC U3003:17, GO to Pinpoint Test F 
    No  GO to  CI4

  5. CI4 RETRIEVE ALL DTC (DIAGNOSTIC TROUBLE CODE) S FROM THE GWM (GATEWAY MODULE A)

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

    • RECORD all DTC s from the GWM self-test.

    Are any DTC s present in the GWM ' 

    Yes  DIAGNOSE the GWMDTC. REFER to: Controller Area Network (CAN) Module Communications Network .
    No  GO to  CI5

  6. CI5 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 a new replacement module.

    • Operate the system and determine if the observable symptom is still present.

    Is the observable symptom still present? 

    Yes  GO to  CI6
    No  The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

  7. CI6 CHECK FOR COMMUNICATION DTC (DIAGNOSTIC TROUBLE CODE) S IN OTHER MODULES

    • Ignition ON.

    • Using a diagnostic scan tool, retrieve the DTC s from the vehicle.
      NOTE: DTC s may be displayed from previous diagnostic actions.

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

    Yes  GO to  CI7
    No  GO to  CI8

  8. CI7 CHECK FOR CORRECT GWM (GATEWAY MODULE A) OPERATION

    • Ignition OFF.

    • 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.

    • 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 C2431A. Make sure the connector seats and latches correctly.

    • Connect ABS module connector C135. Make sure the connectors 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 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 GWM. REFER to: Gateway Module A (GWM) .
    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. CI8 CHECK FOR CORRECT 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.

    • Ignition OFF.

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

    • Connect GWM C2431A. Make sure the connectors seat and latch correctly.

    • Connect.

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

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable 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. REFER to: Electric Brake Booster (EBB) .
    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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