Engine Ignition

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 INTRODUCTION - CNG, FLEX-FUEL & GASOLINE article.

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 ELECTRONIC ENGINE CONTROLS article.