Engine Ignition
WARNING: This page is about a different car, the 2012 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
The Electronic Ignition (EI) system is a coil-on-plug ignition system. The coil-on-plug ignition system consists of the:
- Camshaft Position (CMP) sensor.
- Crankshaft Position (CKP) sensor.
- ignition coil-on-plugs.
- spark plugs.
The CMP sensor:
- is a Hall-effect sensor.
- is mounted in the front cover.
- is triggered by the high point mark on the LH exhaust camshaft.
- sends the PCM a signal indicating camshaft position used for fuel synchronization.
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 ignition coil-on-plugs:
- 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 fine wire design platinum-enhanced active electrode for long life.