| 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. For additional information, refer to the Powertrain Control/Emissions Diagnosis Manual. - 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. For additional information, refer to Section 303-14. | 
