Ignition System: Description and Operation: Description and Operation

Six separate ignition coils:
^ are mounted directly above each spark plug.
^ are controlled by the Powertrain Control Module (PCM) for correct firing sequence.

The spark plug:
^ changes the high voltage pulse into a spark which ignites the fuel and air mixture.
^ originally equipped on the vehicle has a platinum-enhanced active electrode for long life.

Crankshaft Position (CKP) sensor:

NOTE: Initial engine ignition timing is set at 10 degrees ± 2 degrees Before Top Dead Center (BTDC) and is not adjustable.

^ is a variable reluctance sensor triggered by a 36-minus-1 tooth trigger pulse wheel located on the crankshaft located inside the engine front cover.

The sine wave type signal generated from the CKP sensor provides two types of information:
^ position of the crankshaft in 10 degree increments.
^ the crankshaft speed.

The PCM uses this information to determine ignition coil turn ON and turn OFF times and misfire detection.