P1678

DTC P1678: FPTDR Signal Line Malfunction

1. Reset the PCM.
2. Start the engine and wait 60 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 - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the ABS/TCS control unit and at the PCM.