The Electronic Ignition (EI) system is used for both the 3.0L OHV gasoline and Flexible Fuel (FF) engines. The system consists of the following components:
The Crankshaft Position (CKP) sensor is a variable reluctance sensor triggered by a 36 minus 1 tooth trigger wheel located on the crankshaft pulley and damper. The signal generated from the CKP sensor is know as the CKP sensor signal. This signal provides base timing and crankshaft speed (rpm) information to the Powertrain Control Module (PCM). The PCM will use this information along with the spark advance information to determine when to turn the ignition coil on or off.
The ignition coil, which is mounted to the rear of the left-hand cylinder head, contains three separate coils. Each coil is controlled by the PCM through three coil leads. Each coil activates two spark plugs simultaneously.
One spark plug is activated on the compression stroke. This spark plug uses the majority of the ignition coils stored energy. The other plug is activated on the exhaust stroke. This plug will use very little of the coils stored energy. These two spark plugs are connected in series so that the firing voltage of one spark plug will be negative with respect to ground and the other spark plug will be positive with respect to ground.