Possible Causes

• Wiring, terminals or connectors
• Network communication concern
• IPMA
• ABS module

Fig 1: Antilock Braking System (ABS) Module Connector - C135

Courtesy of FORD MOTOR COMPANY

Harness Side

Fig 2: Image Processing Module A (IPMA) Connector - C9224

Courtesy of FORD MOTOR CO.

Harness Side

1. BQ1: CHECK THE COMMUNICATION NETWORK 
   • Ignition ON, engine OFF.
   • Using a diagnostic scan tool, carry out the Network Test.
   • Does the IPMA pass the Network Test? 

     Yes	No
     RETRIEVE and RECORD all IPMA DTCs. REFER to the Lane Keeping System article. If there are no DTCs in the IPMA, Go to  BQ2.	DIAGNOSE the no communication with the IPMA. REFER to the Module Communications Network article.

2. BQ2: RECHECK THE ABS DTCS 
   • Clear the ABS DTCs.
   • Ignition OFF.
   • Ignition ON, engine OFF.

     Carry out the ABS self-test.

   • Retrieve and record the ABS module DTCs.
   • Do any of the DTCs listed in the DTC Fault Trigger Conditions table return? 

     Yes	No
     Go to  BQ3.	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. BQ3: REVIEW THE RECORDED DTCS FROM THE ABS MODULE SELF-TEST 
   • Review the recorded DTCs from the ABS module self-test.
   • Is DTC U3003:16 or U3003:17 recorded? 

     Yes	No
     For DTC U3003:17, GO to PINPOINT TEST F . For DTC U3003:16, GO to PINPOINT TEST A .	Go to  BQ4.

4. BQ4: CHECK FOR DTCS IN THE IPMA 

   Carry out the IPMA self-test.

   • Are any DTCs present in the IPMA? 

     Yes	No
     DIAGNOSE the IPMA DTCs. REFER to the Lane Keeping System article.	Go to  BQ5.

5. BQ5: 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 IPMA 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  BQ6.	The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

6. BQ6: CHECK FOR COMMUNICATION DTCS SET IN OTHER MODULES 
   • Retrieve the continuous memory DTCs.
   • Is DTC U023A:xx, U0265:xx or U053B:xx set in 1 or more modules in addition to the ABS module? 
7. BQ7: CHECK FOR CORRECT IPMA OPERATION 
   NOTE: The battery must be removed to access the ABS module electrical connector.
   • Ignition OFF.
   • Remove the battery. Refer to the appropriate procedure in the Battery, Mounting and Cables article.
   • IPMA connector disconnected. (C9224)
   • 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.
   • IPMA connector disconnected. (C9224) Make sure the connector seats and latches correctly.
   • Install the battery. Refer to the appropriate procedure in the Battery, Mounting and Cables article.
   • Operate the system and determine if the concern is still present.
   • Is the concern still present? 

     Yes	No
     INSTALL a new IPMA. 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 IPMA. REFER to Interior Rear View Mirror Removal and Installation in the Rear View Mirrors article.	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

8. BQ8: CHECK FOR CORRECT ABS MODULE OPERATION 
   NOTE: The battery must be removed to access the ABS module electrical connector.
   • Ignition OFF.
   • Remove the battery. Refer to the appropriate procedure in the Battery, Mounting and Cables article.
   • ABS Module connector disconnected. (C135)
   • IPMA connector disconnected. (C9224)
   • 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
   • IPMA connector disconnected. (C9224) Make sure the connector seats and latches correctly.
   • ABS Module connector disconnected. (C135) Make sure the connector seats and latches correctly.
   • Install the battery. Refer to the appropriate procedure in the Battery, Mounting and Cables article.
   • Operate the system and determine if 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 ABS module Removal and Installation procedure in the Anti-Lock Brake System (ABS) and Stability Control article. ORDER a replacement ABS module and INCLUDE the RVC form. If this is a Ford repair, INCLUDE the RVC on the warranty claim form.

     The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

9. BQ9: CHECK FOR CORRECT ABS OPERATION 
   • Ignition OFF.
   • ABS_A Module connector disconnected.
   • ABS_B Module connector disconnected.
   • IPMA connector disconnected. (C9224)
   • 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
   • IPMA connector disconnected. (C9224) Make sure the connector seats and latches correctly.
   • ABS_B Module connector disconnected. Make sure the connector seats and latches correctly.
   • ABS_A Module connector disconnected. Make sure the connector seats and latches correctly.
   • Operate the system and determine if 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 repair, INCLUDE the RVC on the warranty claim form.

     The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.