Engine Ignition

The electronic ignition (EI) system is a coil-on-plug ignition system. The coil-on-plug ignition system consists of the following components:

• Ignition coil-on-plugs
• Spark plugs
• Crankshaft position (CKP) sensor
• Camshaft position (CMP) sensor

The ignition coil-on-plugs:

• change low voltage signals from the PCM to high-voltage pulses.
• supply the high-voltage pulses to the spark plugs.
• are connected directly to each spark plug.
• have replaceable coil boots (2.5L).

The spark plugs:

• change high-voltage pulses into a spark which ignites the fuel and air mixture.

The CKP sensor:

• is a variable reluctance sensor.
• is triggered by a 36-minus-1 tooth trigger wheel mounted on the crankshaft.
• provides base timing and crankshaft speed (RPM) to the PCM.

The CMP sensor (2.5L):

• is a variable reluctance sensor.
• provides camshaft rotational location information to the PCM.

The CMP sensor (3.0L):

• is a Hall-effect sensor.
• is mounted in the front cover.
• is triggered by the high point mark on the intake camshaft trigger wheel.
• provides camshaft rotational location information to the PCM.