Engine Ignition

The Electronic Ignition (EI) system is a coil-on-plug ignition system. The coil-on-plug ignition system consists of the:

• 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.

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.
• is essential for calculating spark timing.

The CMP sensor:

• is a Hall-effect sensor.
• provides camshaft rotational location information to the PCM.
• sends the PCM a signal indicating camshaft position used for fuel synchronization.