Failure Effects Mode Management (Fail Safe Operation)

OPERATION
During some electronic ignition system concerns, the Failure Mode Effects Management portion of the Powertrain Control Module (PCM) will maintain vehicle operation:

- If the spark output signal is interrupted, the PCM will automatically turn the coil per plug unit ON and OFF using the Crankshaft Position (CKP) signal input. This will result in fixed-spark timing (10 degrees BTDC) and fixed dwell time (no Computer Controlled Dwell [CCD]).

- If the PCM does not receive the Camshaft Position Sensor (CMP) input during engine cranking, random ignition coil synchronization will be attempted from the PCM. Therefore, several start attempts (cycling ignition switch from OFF to START) may be required to start the engine.

- If the PCM loses CMP input while the engine is running, the PCM will retain the proper firing sequence and it will continue to fire the Coil On Plug (COP) units to maintain engine operation.