Dakota 2WD V6-239 3.9L Magnum (1996)
Ignition Coil: Description and Operation
Ignition Coil
DESCRIPTION
Battery voltage is supplied to the ignition coil positive terminal from the Auto Shutdown (ASD) relay. 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.
OPERATION
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.