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Possible Causes

Fig 1: Anti-Lock Brake System-A (ABS-A) Module Connector - C135A
G13402608Courtesy of FORD MOTOR CO.

Harness Side

Fig 2: Anti-Lock Brake System-B (ABS-B) Module Connector - C135B
G13402609Courtesy of FORD MOTOR CO.

Harness Side

Fig 3: Secondary On-Board Diagnostic Control Module (SOBDM) Connector - C1458A
G13402610Courtesy of FORD MOTOR CO.

Harness Side

  1. CM1: CHECK THE HYBRID PCM COMMUNICATION 
    NOTE: They hybrid PCM may also be known as the SOBDM or the ICS module.
    • 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 hybrid PCM pass the Network Test? 
      Yes No
      RETRIEVE and RECORD all hybrid PCM DTCs.
      REFER to the Electronic Engine Controls article diagnose the DTCs. If there are no DTCs present in the hybrid PCM,
      Go to  CM3.      		 Go to  CM2.
  2. CM2: CHECK THE GWM COMMUNICATION 
    • Review the results of the modules communicating on the network from the previous step.
    • Did the GWM pass the Network Test? 
      Yes No
      DIAGNOSE the hybrid PCM does not communicate with the diagnostic scan tool. REFER to the Module Communications Network article. DIAGNOSE the scan tool does not communicate with the GWM. REFER to the Module Communications Network article.
  3. CM3: RECHECK THE ABS MODULE FOR THE LOST COMMUNCATION DTC 
    • Clear the ABS DTCs.
    • Ignition OFF.
    • Ignition ON, engine OFF.

      Carry out the ABS self-test.

    • Do any of the DTCs listed in the DTC Fault Trigger Conditions table return? 
      Yes No
      Go to  CM4. 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. CM4: REVIEW THE ABS MODULE SELF-TEST FOR VOLTAGE-REALTED DTCS 
    • 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  CM5.
  5. CM5: CHECK FOR GWM DTCS 

    Carry out the GWM self-test.

    • Are any DTCs present? 
      Yes No
      DIAGNOSE the GWM DTC. REFER to the Module Communications Network article. Go to  CM6.
  6. CM6: CHECK FOR HYBRID PCM DTCS 

    Carry out the SOBDM self-test.

    • Are any DTCs present? 
      Yes No
      DIAGNOSE the hybrid PCM DTC. REFER to the appropriate Electronic Engine Controls article. Go to  CM7.
  7. CM7: 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 hybrid PCM 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  CM8. The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.
  8. CM8: CHECK FOR COMMUNICATION DTCS IN OTHER MODULES 
    • Ignition ON, engine OFF.
    • Retrieve the continuous memory DTCs.
    • Is DTC U0293:xx or U0594:xx set in 1 or more modules in addition to the ABS module? 
  9. CM9: VERIFY HYBRID PCM OPERATION 
    NOTE: They hybrid PCM may also be known as the SOBDM or the ICS module.
    • Ignition OFF.
    • SOBDM connector disconnected. (C1458A)
    • GWM connector disconnected. (C2431)
    • ABS_A Module connector disconnected. (C135A)
    • ABS_B Module connector disconnected. (C135B)
    • 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
    • ABS_B Module connector connected. (C135B) Make sure the connector seats and latches correctly.
    • ABS_A Module connector connected. (C135A) Make sure the connector seats and latches correctly.
    • GWM connector connected. (C2431) Make sure the connector seats and latches correctly.
    • SOBDM connector connected. (C1458A) 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 PCM.
      They hybrid PCM may also be known as the SOBDM or the ICS 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 service articles address this concern, INSTALL a new hybrid PCM. REFER to the appropriate Electronic Engine Controls 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. CM10: VERIFY ABS OPERATION 
    • Ignition OFF.
    • ABS Module connector disconnected.
    • GWM connector disconnected. (C2431)
    • ICS_A Module 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
    • ICS_A Module 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. 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 service articles address this concern, INSTALL a new ABS module assembly. 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.
  11. CM11: VERIFY ABS OPERATION 
    • Ignition OFF.
    • ABS_A Module connector disconnected. (C135A)
    • ABS_B Module connector disconnected. (C135B)
    • GWM connector disconnected. (C2431)
    • SOBDM connector disconnected. (C1458A)
    • 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
    • SOBDM connector connected. (C1458A) Make sure the connector seats and latches correctly.
    • GWM connector connected. (C2431) Make sure the connector seats and latches correctly.
    • ABS_B Module connector connected. (C135B) Make sure the connector seats and latches correctly.
    • ABS_A Module connector connected. (C135A) 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 EBB assembly.
      The HCU and ABS module are a single assembly known as the EBB unit.
      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 the Anti-Lock Brake System (ABS) and Stability Control article.
      ORDER a replacement EBB unit 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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