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Possible Causes

Fig 1: Antilock Braking System (ABS) Module Connector - C135
GFDWR60833Courtesy of FORD MOTOR COMPANY

Harness Side

Fig 2: Gateway Module A (GWM) Connector - C2431
G13342007Courtesy of FORD MOTOR CO.

Harness Side

Fig 3: Powertrain Control Module-B (PCM-B) Connector - C1381B
GFDWR61163Courtesy of FORD MOTOR COMPANY

Harness Side

  1. AI1: CHECK THE PCM 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 PCM pass the Network Test? 
    Yes No
    RETRIEVE and RECORD all PCM DTCs. REFER to Engine Controls - Introduction (Except Diesel & Hybrid) . If there are no DTCs in the PCM, Go to  AI3. Go to  AI2.
  2. AI2: 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 PCM does not communicate with the diagnostic scan tool. REFER to the appropriate Electrical Distribution article. DIAGNOSE the scan tool does not communicate with the GWM. REFER to the appropriate Electrical Distribution article.
  3. AI3: RECHECK THE ABS MODULE FOR THE LOST COMMUNICATION 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  AI4. 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. AI4: 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  AI5.
  5. AI5: CHECK FOR GWM DTCS 

    Carry out the GWM self-test.

    • Are any DTCs present? 
    Yes No
    DIAGNOSE the GWM DTC. REFER to the appropriate Electrical Distribution article. Go to  AI6.
  6. AI6: CHECK FOR PCM DTCS 

    Carry out the PCM KOEO self-test.

    • Are any DTCs present? 
    Yes No
    DIAGNOSE the PCM DTC. REFER to the appropriate Electronic Engine Controls article. Go to  AI7.
  7. AI7: 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 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  AI8. The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.
  8. AI8: CHECK FOR COMMUNICATION DTCS IN OTHER MODULES 
    • Ignition ON, engine OFF.
    • Retrieve the continuous memory DTCs.
    • Is any DTC from the Fault Trigger Conditions Table also set in 1 or more modules in addition to the ABS module? 
    Yes No
    Go to  AI9. Go to  AI10.
  9. AI9: VERIFY PCM OPERATION 
    • Ignition OFF.
      NOTE: The battery must be removed to access the ABS module electrical connector.
    • Remove the battery. Refer to the appropriate procedure in the appropriate Battery, Mounting and Cables article.
    • PCM_B connector disconnected. (C1381B)
    • PCM_E connector disconnected.
    • GWM connector disconnected. (C2431)
    • ABS Module connector disconnected. (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
    • 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.
    • PCM_E connector connected. Make sure the connector seats and latches correctly.
    • PCM_B connector connected. (C1381B) Make sure the connector seats and latches correctly.
    • Install the battery. Refer to the appropriate procedure in the appropriate Battery, Mounting and Cables article.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    Yes No
    INSTALL a new PCM.
    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 PCM. REFER to the appropriate Electronic Engine Controls article.
    ORDER a replacement PCM 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.
  10. AI10: VERIFY ABS MODULE OPERATION 
    • Ignition OFF.
      NOTE: The battery must be removed to access the ABS module electrical connector.
    • Remove the battery. Refer to the appropriate procedure in the appropriate Battery, Mounting and Cables article.
    • ABS Module connector disconnected. (C135)
    • GWM connector disconnected. (C2431)
    • PCM_B connector disconnected. (C1381B)
    • PCM_E 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
    • PCM_E connector connected. Make sure the connector seats and latches correctly.
    • PCM_B connector connected. (C1381B) 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.
    • Install the battery. Refer to the appropriate procedure in the appropriate Battery, Mounting and Cables article.
    • 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. REFER to the appropriate 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. AI11: VERIFY ABS OPERATION 
    • Ignition OFF.
      NOTE: The battery must be removed to access the ABS module electrical connector.
    • Remove the battery. Refer to the appropriate procedure in the appropriate Battery, Mounting and Cables article.
    • ABS Module connector disconnected. (C135)
    • GWM connector disconnected. (C2431)
    • PCM_B connector disconnected. (C1381B)
    • PCM_E 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
    • PCM_B connector connected. (C1381B) Make sure the connector seats and latches correctly.
    • PCM_E 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.
    • Install the battery. Refer to the appropriate procedure in the appropriate Battery, Mounting and Cables article.
    • 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 and HCU assembly. REFER to the appropriate Anti-Lock Brake System (ABS) and Stability Control article.
    ORDER a replacement ABS module and HCU assembly. 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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