Electronic Ignition System

The electronic ignition (EI) system consists of the following components.
^ ignition coil
^ spark plug
^ spark plugs wires
^ Crankshaft Position (CKP) sensor
^ Camshaft Position (CMP) sensor

The Crankshaft Position (CKP) sensor:
^ is a variable reluctance sensor.
^ is mounted in the front cover.
^ is triggered by a 36-minus-1 tooth trigger wheel located behind the front cover.
^ provides base timing and crankshaft speed (rpm) to the Powertrain Control Module (PCM).

The Camshaft Position (CMP) sensor:
^ is a variable reluctance sensor.
^ is mounted in the front cover.
^ is triggered by the high point mark on the LH exhaust camshaft.
^ provides camshaft rotational location information to the Powertrain Control Module (PCM).

The ignition coil:
^ is controlled by the PCM.
^ fires two spark plugs simultaneously.

The spark plug:
^ ignites the fuel and air mixture.

The spark plug wire:
^ carries high voltage pulses from the ignition coil to the spark plugs.

Refer to Computers and Control Systems for additional information on ignition coil matched pairs.