RAM 1500 Truck 2WD V6-3.9L VIN X (1999)
Ignition Coil: Description and Operation
IGNITION COIL
Battery voltage is supplied to the ignition coil positive terminal from the ADS 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.
IGNITION COIL-ENGINES - PCM OUTPUT
System voltage is supplied to the ignition coil positive terminal. The powertrain control module (PCM) operates the ignition coil. Base (initial)
ignition timing is not adjustable. The PCM adjusts ignition timing to meet changing engine operating conditions.
Ignition Coil - Typical
The ignition coil is located near the front of the right cylinder head.
