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Pinpoint Tests AU: ABS Module Communication Concern With The 4WD/AWD Module

  1. AU1: CHECK THE COMMUNICATION NETWORK 
    • Ignition ON, engine OFF.
    • Press the Read Vehicle Information button to view the results of the modules communicating on the network.
    • Retrieve the continuous memory DTCs.
    • Does the AWD module and the GWM pass the network test? 
      Yes No
      Go to  AU2. REFER to Module Communications Network to diagnose the module not responding to the scan tool.
  2. AU2: RECHECK FOR THE ABS MODULE DTCS 
    • Carry out the ABS self-test.
    • Ignition OFF.
    • Ignition ON, engine OFF.
    • Carry out the ABS self-test.
    • Record all ABS module DTCs.
    • Is DTC U0102:xx retrieved again? 
      Yes No
      Go to  AU3. The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
  3. AU3: CHECK FOR VOLTAGE DTCS IN THE ABS MODULE 
    • Review the recorded DTCs from the ABS module self-test.
    • Is DTC U3003:16 or U3003:17 present? 
      Yes No
      For DTC U3003:17, Go to PINPOINT TEST F .
      For DTC U3003:16, Go to PINPOINT TEST A .      		 Go to  AU4.
  4. AU4: CHECK FOR DTCS IN THE GWM 
    • Carry out the GWM self-test.
    • Record all DTCs from the GWM self-test.
    • Are any DTCs present? 
      Yes No
      DIAGNOSE the GWM DTCs. REFER to Module Communications Network . Go to  AU5.
  5. AU5: CHECK FOR DTCS IN THE AWD MODULE 
    • Carry out the AWD self-test.
    • Record all DTCs from the AWD module self-test.
    • Are any DTCs present? 
      Yes No
      DIAGNOSE the AWD module DTCs. REFER to the appropriate Diagnosis and Testing in the appropriate Power Transfer Unit article. Go to  AU6.
  6. AU6: 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 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 No
      Go to  AU7. The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.
  7. AU7: VERIFY ALL WIRING CONNECTIONS 
    • Ignition OFF.
    • Disconnect the ABS module connector.
    • Disconnect the AWD module connectors.
    • Disconnect all in-line electrical connectors between the ABS module and the AWD module.
    • 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
    • Are the connectors free of corrosion, damaged pins, bent pins, pushed-out pins and spread terminals? 
      Yes No
      Go to  AU8. REPAIR the connector or terminals. Refer to OEM Connector Repair Procedures , for schematic and connector information.
  8. AU8: CHECK FOR DTC U0102:XX SET IN OTHER MODULES 
    • Connect all in-line electrical connectors between the ABS module and the AWD module. Make sure they seat and latch correctly.
    • Connect all AWD module electrical connectors. Make sure they seat and latch correctly.
    • Connect the ABS module connector. Make sure it seats and latches correctly.
    • Ignition ON, engine OFF.
    • Press the Read Vehicle Information button to view the results of the continuous DTCs set in other modules.
    • Retrieve the continuous memory DTCs.
    • Review the CMDTCs from all modules.
    • Is DTC U0102:xx set in 1 or more modules in addition to the ABS module? 
      Yes No
      CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new AWD module. REFER to the appropriate Removal and Installation procedure in the appropriate Power Transfer Unit article. INSTALL a new ABS module.
      CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new ABS module.
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