Engine Ignition
WARNING: This page is about a different car, the 2011 Mercury Milan and 2011 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:
- 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.