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Pinpoint Test At: Abs (Anti-Lock Brake System) Module Communication Concern With TCCM (Transfer Case Control Module)

  1. Refer to Module Communications Network for schematic and connector information.

    Normal Operation and Fault Conditions 

    With the ignition ON, the TCCM sends messages to the ABS module over the CAN. If the ABS module does not receive these messages within the specified time frame, the ABS module sets Diagnostic Trouble Codes (DTCs). This can be due to a TCCM failure, a circuit failure on the CAN or an excessive load on the network. For information on the messages sent to the ABS module by the TCCM, 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 U0102:00 Lost Communication with Transfer Case Control Module: No Sub Type Information Sets when any of the TCCM messages are missing. This can be due to a TCCM failure, a circuit failure on the CAN or an excessive load on the network.

    Possible Causes 

    • Network communication concern
    • TCCM
    • GWM

  2. AT1 CHECK THE TCCM (TRANSFER CASE CONTROL MODULE) COMMUNICATION

    NOTE: The TCCM may also be known as the AWD module or the 4WD module.

    • Ignition ON.

    • NOTE: DTCs may be displayed from previous diagnostic actions.

    Does the TCCM pass the network test? 

    Yes  RETRIEVE and RECORD all TCCM DTCs. If there are no DTCs in the TCCM, GO to  AT3.
    No  GO to  AT2.

  3. AT2 CHECK THE COMMUNICATION TO THE GWM (GATEWAY MODULE A)

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

    Did the GWM pass the network test? 

    Yes  DIAGNOSE the TCCM does not communicate with the diagnostic scan tool. REFER to: COMMUNICATIONS NETWORK .
    No  DIAGNOSE the GWM does not communicate with the diagnostic scan tool. REFER to: COMMUNICATIONS NETWORK .

  4. AT3 RECHECK FOR THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DTCS

    • 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.

    • Ignition ON.

    • Record all ABS module DTCs.

    Are any of the DTCs listed in the Fault Trigger Conditions table retrieved again? 

    Yes  GO to  AT4.
    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. AT4 CHECK FOR VOLTAGE DTCS IN THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE

    • Review the recorded DTCs from the ABS module self-test.

    Is DTC U3003:16 or U3003:17 present? 

    Yes  DIAGNOSE the DTC. REFER to the DIAGNOSTIC TROUBLE CODE (DTC) CHART .
    No  GO to  AT5.

  6. AT5 CHECK FOR DTCS IN THE GWM (GATEWAY MODULE A)

    • Record all DTCs from the GWM self-test.

    Are any DTCs present? 

    Yes  DIAGNOSE the GWM DTCs.
    No  GO to  AT6.

  7. AT6 CHECK FOR DTCS IN THE AWD (ALL-WHEEL DRIVE)

    NOTE: The TCCM may also be known as the AWD module or the 4WD module.

    • Drive the vehicle for a minimum of 1 mile.

    Are any DTCs present? 

    Yes  DIAGNOSE the AWDDTCs.
    No  GO to  AT7.

  8. AT7 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 TCCM or 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 observable symptom is still present.

    Is the observable symptom still present? 

    Yes  GO to  AT8.
    No  The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

  9. AT8 CHECK FOR COMMUNICATION DTCS IN OTHER MODULES

    • Ignition ON.

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

    Is DTC U0102:xx or U0403:xx set in 1 or more modules in addition to the ABS module? 

    Yes  GO to  AT9.
    No  GO to  AT10.

  10. AT9 VERIFY TCCM (TRANSFER CASE CONTROL MODULE) OPERATION

    NOTE: The TCCM may also be known as the AWD module or the 4WD module.

    • Ignition OFF.

    • Disconnect ABS Module connectors.

    • Disconnect TCCM connectors.

    • 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. Make sure the connector seats and latches correctly.

    • Connect TCCM connectors. Make sure the connectors seat and latch correctly.

    • Connect ABS Module connectors. Make sure the connectors seat and latch correctly.

    • Operate the system and verify 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 TCCM.
    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.

  11. AT10 VERIFY ABS (ANTI-LOCK BRAKE SYSTEM) OPERATION

    NOTE: The TCCM may also be known as the AWD module or the 4WD module.

    • Ignition OFF.

    • Disconnect ABS Module connectors.

    • Disconnect TCCM connectors.

    • 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. Make sure the connector seats and latches correctly.

    • Connect TCCM connectors. Make sure the connectors seat and latch correctly.

    • Connect ABS Module connectors. Make sure the connectors seat and latch correctly.

    • Operate the system and verify 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) .
    INSTALL a new Electric Brake Boost (EBB) assembly.
    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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