Ignition Control Module: Description and Operation

NOTE: All engines use a fixed ignition timing system. Basic ignition timing is not adjustable. All spark advance is determined by the Powertrain Control Module (PCM).

The distributorless ignition system used on these engines is referred to as the Direct Ignition System (DIS). The system's four main components are the ignition coils, crankshaft position sensor, camshaft position sensor and ASD relay. The coil on plug ignition system utilizes an ignition coil for every cylinder, it is mounted directly over the each spark plug.

The crankshaft position sensor and camshaft position sensor are hall effect devices. The camshaft position sensor and crankshaft position sensor generate pulses that are inputs to the PCM. The PCM determines crankshaft position from these sensors. The PCM calculates injector sequence and ignition timing from crankshaft position.