Pinpoint Test E : Lost Communication With Abs (Anti-Lock Brake System) Module U0121:87
WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.
- E1 CHECK THE COMMUNICATION NETWORK
- Perform a network test.
Does the ABS module pass the network test?
Yes GO to E2 No DIAGNOSE no communication with the ABS module. REFER to: Communications Network . - E2 RETRIEVE THE DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE BCM (BODY CONTROL MODULE) SELF-TEST
- Perform the BCM self-test.
Is DTC U3006:16 or U3006:17 recorded?
Yes For DTC U3006:16, GO to Pinpoint Test O For DTC U3006:17, GO to Pinpoint Test P No GO to E3 - E3 RETRIEVE THE DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST
- Perform the ABS module self-test.
Are any voltage system related Diagnostic Trouble Codes (DTCs) recorded?
Yes REFER to: Anti-Lock Brake System (ABS) . No GO to E4 - E4 RECHECK THE BCM (BODY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during the PMI or the PMI may not have been carried out.
- Clear the Diagnostic Trouble Codes (DTCs).
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Perform the BCM self-test.
Is DTC U0121:87 present?
Yes GO to E5 No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. - E5 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) U0121:87 SET IN OTHER MODULES
- Clear all Diagnostic Trouble Codes (DTCs).
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Retrieve all Continuous Memory Diagnostic Trouble Codes (CMDTCs).
Is DTC U0121:87 set in other modules?
Yes GO to E6 No GO to E7 - E6 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION
- Ignition OFF.
- Disconnect and inspect the ABS module connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the ABS module connectors. Make sure it seats and latches correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable 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, Refer to ABS GUIDED ROUTINE TESTING No 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. - E7 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION
- Ignition OFF.
- Disconnect and inspect all BCM connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the BCM connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable 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, Refer to BCM GUIDED ROUTINE TESTING No 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.