Durango 4WD V8-5.9L VIN Z (1998)
Ignition Coil: Description and Operation
SYSTEM OPERATION
Battery voltage is supplied to the ignition coil positive terminal from the Automatic Shutdown (ASD) relay.
The Powertrain Control Module (PCM) opens and closes the ignition coil ground circuit for ignition coil operation.
Base ignition timing is not adjustable on any engine. 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.
