DTC P1678: FPTDR Signal Line Failure
- Reset the PCM (see HOW TO RESET THE PCM ).
- Start the engine, and wait 60 seconds.
Is DTC P1678 indicated?
- YES: Go to step 3.
- NO: Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ABS/TCS control unit and the PCM.
- Turn the ignition switch OFF.
- Disconnect the ABS/TCS control unit 16P connector.
- Start the engine, and wait 10 seconds.
Is DTC P1678 indicated?
- YES: Substitute a known-good ABS/TCS control unit and recheck. If the symptom/indication goes away, replace the original ABS/TCS control unit.
- NO: Substitute a known-good PCM and recheck (see HOW TO SUBSTITUTE THE PCM FOR TESTING PURPOSE ). If the symptom/indication goes away, replace the original PCM.