Pinpoint Test L : C1278, U0131, U0428
WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
- L1 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Using a diagnostic scan tool, carry out a Network Test.
Does the PSCM pass the Network Test?
Yes GO to L2. No DIAGNOSE the no communication with the PSCM concern. REFER to Diagnosis and Testing in Module Communications Network . - L2 RECHECK THE ABS MODULE DTCs
- Using a diagnostic scan tool, carry out the ABS module self-test.
- Using a diagnostic scan tool, clear the ABS module DTCs.
- Ignition OFF.
- Ignition ON.
- Using a diagnostic scan tool, carry out the ABS module self-test.
- Record the ABS module DTCs.
Is DTC C1278, U0131 or U0428 present?
Yes GO to L3. 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. - L3 REVIEW THE RECORDED ABS MODULE DTCs
- Review the previously recorded ABS module DTCs.
Was DTC B1676 recorded?
Yes GO to Pinpoint Test A . No GO to L4. - L4 CHECK THE PSCM FOR DTCs
- Using a diagnostic scan tool, carry out the PSCM self-test.
Are any battery voltage DTCs present in the PSCM ?
Yes DIAGNOSE the PSCM DTCs. REFER to Power Steering . No GO to L5. - L5 CHECK FOR DTC U0131, U0131:XX, U0428 or U0428:XX SET IN OTHER MODULES
- Using a diagnostic scan tool, carry out the self-test for all modules.
- Retrieve and record all CMDTCs.
Is DTC U0131, U0131:XX, U0428 or U0428:XX set in 1 or more modules in addition to the ABS module?
Yes CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, . No CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new ABS module. Anti-Lock Brake System (ABS) Module .