Engine Ignition
WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
The electronic ignition system is a coil-on-plug ignition system. The coil-on-plug ignition system consists of the following components:
- crankshaft position (CKP) sensor
- ignition coils
- spark plugs
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 powertrain control module (PCM).
The eight separate ignition coils:
- change low voltage signals from the PCM to high voltage pulses
- produce the high voltage pulses to the spark plugs.
- are connected directly to each spark plug.
The spark plugs:
- change high voltage pulses into a spark which ignites the fuel and air mixture.
- originally equipped on the vehicle have a platinum-enhanced active electrode for long life.