Grand Cherokee 2WD V8-4.7L VIN N (2000)
Ignition Coil: Description and Operation
Ignition Coil
Ignition Coil Location
IGNITION COIL
This V-8 engine uses 8 dedicated and individually fired ignition coils; one coil for each spark plug. Each coil is mounted directly to the top of each
spark plug.
Battery voltage is supplied to the 8 ignition coils from the ASD relay. The Powertrain Control Module (PCM) opens and closes each ignition coil
ground circuit at a determined time for ignition coil operation.
Base ignition timing is not adjustable. By controlling the coil ground circuit, the PCM is able to set the base timing and adjust the ignition timing
advance. This is done to meet changing engine operating conditions.
The ignition coil is not oil filled. The windings are embedded in an epoxy compound. This provides heat and vibration resistance that allows the
ignition coil to be mounted on the engine.
