Spark Control System

GENERAL DESCRIPTION
The ignition circuit consists of the battery, distributor, ignition switch, spark plugs, igniter, and primary and secondary wiring. All models are equipped with an electronic spark advance Ignition Control (IC) system which is monitored and controlled by the Powertrain Control Module (PCM).

IGNITION CONTROL SYSTEM
The distributor used within the ignition system consists of a signal generator (signal rotor and Camshaft Position [CMP] sensor) and rotor. Vehicles are equipped with an externally mounted igniter, which determines the best time to fire the ignition coil and the spark plugs.

All spark timing changes in the distributor are performed electronically by the PCM. The PCM monitors information from various engine sensors, computes desired spark timing, and signals the distributor to change the timing accordingly. No vacuum or mechanical advance mechanisms are used. The ignition system includes a noise suppressor filter to eliminate ignition sound. The noise suppressor filter also provides the tachometer (if equipped) with an ignition signal.