P1678
DTC P1678: FPTDR Signal Line Failure - A/T Model1. Reset the PCM.
2. 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 wires at the ABS/TCS control unit and at the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the ABS/TCS control unit 16P connector.
5. 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. If the symptom/indication goes away, replace the original PCM.