Possible Causes
- Wiring, terminals or connectors
- Network communication concern
- IPMB
- ABS module
Harness Side
Harness Side
- CK1: 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 IPMB pass the network test?
Yes No RETRIEVE and RECORD all IPMB DTCs. REFER to the appropriate Parking Aid article. If there are no DTCs in the IPMB, Go to CK2. DIAGNOSE the IPMB does not communicate with the diagnostic scan tool. REFER to the Module Communications Network article.
- CK2: RECHECK THE ABS MODULE FOR THE LOST COMMUNICATION DTC
- Clear the ABS DTCs.
- Ignition ON, engine OFF.
Carry out the ABS self-test.
- Are any of the DTCs listed in the Fault Trigger Conditions table still present?
Yes No Go to CK3. The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
- CK3: 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 U3003:17, GO to PINPOINT TEST A .
For DTC U3003:16, GO to PINPOINT TEST F .Go to CK4.
- CK4: CHECK FOR IPMB DTCS
Carry out the IPMB self-test.
- Are any DTCs present?
Yes No DIAGNOSE the IPMB DTC. REFER to the appropriate Parking Aid article. Go to CK5.
- Are any DTCs present?
- CK5: 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 IPMB 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 CK6. The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.
- Check the vehicle service history for recent service actions related to the IPMB or the ABS module. If recent service history is found:
- CK6: CHECK FOR COMMUNICATION DTCS IN OTHER MODULES
- CK7: VERIFY IPMB OPERATION
- Ignition OFF.
- IPMB connector disconnected.
- 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.
- IPMB 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 IPMB.
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 IPMB. REFER to the appropriate Parking Aid 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.
- CK8: VERIFY ABS OPERATION
- Ignition OFF.
- ABS_A Module connector disconnected. (C135A)
- ABS_B Module connector disconnected. (C135B)
- IPMB 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
- IPMB connector connected. 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 (general service bulletin), SSM (special service message) or FSA (Field Service Action).
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.