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Home >> Ford >> 2020 >> Edge ST-Line, FWD >> Repair and Diagnosis >> Brakes >> Brakes Control Systems >> Abs Guided Routine >> Pinpoint Tests >> Pinpoint Tests S: ABS Module Communication Concern With TBC >> Possible Causes
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Possible Causes

  1. S1: 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 TBC pass the Network Test? 
      Yes No
      RETRIEVE and RECORD all TBC DTCs. REFER to the Auxiliary Brake article. If there are no DTCs in the TBC,
      Go to  S3.      		 Go to  S2.
  2. S2: CHECK THE GWM COMMUNICATION 
    • 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 GWM pass the network test? 
      Yes No
      DIAGNOSE the TBC does not communicate with the diagnostic scan tool. REFER to the Module Communications Network article. DIAGNOSE the GWM does not communicate with the diagnostic scan tool. REFER to the Module Communications Network article.
  3. S3: RECHECK THE ABS MODULE DTCS 

    Carry out the ABS self-test.

    • Record all ABS module DTCs.
    • Clear the ABS DTCs.
    • Ignition OFF.
    • Ignition ON, engine OFF.

      Carry out the ABS self-test.

    • Are any of the DTCs listed in the Fault Trigger Conditions Table retrieved again? 
      Yes No
      Go to  S4. 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. S4: CHECK FOR VOLTAGE DTCS IN THE ABS MODULE 
    • Review the results from the ABS module self-test.
    • Is DTC U3003:16 or U3003:17 present? 
      Yes No
      For DTC U3003:16, GO to PINPOINT TEST A .
      For DTC U3003:17, GO to PINPOINT TEST F .      		 Go to  S5.
  5. S5: RETRIEVE ALL DTCS FROM 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 DTC. REFER to the Module Communications Network article. Go to  S6.
  6. S6: RETRIEVE ALL DTCS FROM THE TBC 
    • Using a diagnostics scan tool, carry out the TBC self-test.
    • Record all DTCs from the TBC self-test.
    • Are any DTCs present? 
      Yes No
      DIAGNOSE the TBC DTC. REFER to the Auxiliary Brake article. Go to  S7.
  7. S7: 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 TBC 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 observable symptom is still present.
    • Is the observable symptom still present? 
      Yes No
      Go to  S8. The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.
  8. S8: CHECK FOR COMMUNICATION DTCS IN OTHER MODULES 
    • Ignition ON, engine OFF.
    • Clear the ABS DTCs.
    • Retrieve the continuous memory DTCs.
    • Is DTC U0137:xx set in 1 or more modules in addition to the ABS module? 
      Yes No
      Go to  S9. Go to  S10.
  9. S9: VERIFY TBC OPERATION 
    • Ignition OFF.
    • GWM connector disconnected. (C2431)
    • ABS Module connector disconnected. (C135)
    • TBC connector disconnected.
    • 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
    • TBC connector connected. Make sure the connector seats and latches correctly.
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • GWM connector connected. (C2431) Make sure the connector seats and latches correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
      Yes No
      INSTALL a new TBC.
      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 TBC. REFER to the Auxiliary Brake article.      		 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.
  10. S10: VERIFY ABS MODULE OPERATION 
    • Ignition OFF.
    • ABS Module connector disconnected. (C135)
    • GWM connector disconnected. (C2431)
    • TBC connector disconnected.
    • 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
    • TBC connector connected. Make sure the connector seats and latches correctly.
    • GWM connector connected. (C2431) Make sure the connector seats and latches correctly.
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
      Yes No
      INSTALL a new ABS module.
      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 ABS module. REFER to the Anti-Lock Brake System (ABS) and Stability Control article.
      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.      		 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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