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Pinpoint Test Bx: Abs (Anti-Lock Brake System) Module Communication Concern With AWD Module

  1. Normal Operation and Fault Conditions 

    With the ignition ON, the AWD module sends messages to the GWM over the HS-CAN1. The GWM relays these message to the ABS module over the HS-CAN2. 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 AWD module 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 AWD module. REFER to: DIAGNOSIS AND TESTING .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    ABS U011D:00 Lost Communication With All Wheel Drive Control Module: No Sub Type Information This DTC sets when the ABS module does not receive any messages from the AWD module within the allowed time.
    ABS U041E:00 Invalid Data Received From All Wheel Drive Control Module: No Sub Type Information This DTC sets when the ABS module receives messages but the messages contain invalid data.

    Possible Causes 

    • Network communication concern
    • AWD module

  2. BX1 CHECK THE COMMUNICATION NETWORK

    • Ignition ON.

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

    Does the AWD module pass the Network Test? 

    Yes  RETRIEVE and RECORD all AWD module DTC's. REFER to: DIAGNOSTIC TROUBLE CODE (DTC) CHART . If there are no DTC's in the AWD module. GO to  BX3
    No  GO to  BX2

  3. BX2 CHECK THE GWM (GATEWAY MODULE A) COMMUNICATION

    • Review the results of the modules communicating on the network from the previous step.

    Did the GWM pass the Network Test? 

    Yes  DIAGNOSE the AWD module does not communicate with the diagnostic scan tool. REFER to: Communications Network in the appropriate Module Communications Network article.
    No  DIAGNOSE the scan tool does not communicate with the GWM. REFER to: Communications Network in the appropriate Module Communications Network article.

  4. BX3 CHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE CMDTCS

    • 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 self-test.

    • Retrieve and record the ABS module DTC's.

    Is any listed in the DTC Fault Trigger Conditions table retrieved again? 

    Yes  GO to  BX4
    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.

  5. BX4 REVIEW THE RECORDED DTCS FROM THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST

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

    Is DTC U3003:16 or U3003:17 recorded? 

    Yes  For DTC U3003:16: GO to Pinpoint Test A  For DTC U3003:17: GO to Pinpoint Test F 
    No  GO to  BX5

  6. BX5 CHECK FOR DTCS IN THE AWD (ALL-WHEEL DRIVE) MODULE

    • Carry out the AWD module self-test.

    Are any DTC's present in the AWD module? 

    Yes  DIAGNOSE the AWD module DTC's. REFER to: DIAGNOSTIC TROUBLE CODE (DTC) CHART .
    No  GO to  BX6

  7. BX6 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 AWD module 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 observable symptom still present? 

    Yes  GO to  BX7
    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.

  8. BX7 CHECK FOR COMMUNICATION DTCS SET IN OTHER MODULES

    • 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 U011D:xx set in 1 or more modules in addition to the ABS module? 

    Yes  GO to  BX8
    No  GO to  BX9
    For all others: Test is complete and no faults were found.

  9. BX8 CHECK FOR CORRECT AWD (ALL-WHEEL DRIVE) 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 AWD module connector C3841.

    • 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 AWD module connector C3841. 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 services articles address this concern, INSTALL a new AWD module. REFER to: ALL-WHEEL DRIVE (AWD) MODULE - 1.5L ECOBOOST (129KW 175PS) (CR) 2.0L ECOBOOST (184KW 250PS) - MI4 . REFER to: ALL-WHEEL DRIVE (AWD) MODULE - 2.5L DURATEC - HYBRID (121KW 164PS) (BG) .
    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.

  10. BX9 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) OPERATION

    • Ignition OFF.

    • Disconnect ABS module connector C135.

    • Disconnect AWD module connector C3841.

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

    • Connect AWD module connector C3841. 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 (HCU and ABS module assembly). REFER to: ELECTRIC BRAKE BOOSTER (EBB) .
    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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