Electronic Ignition System Diagnosis (4.3L, 5.0L & 5.7L): Description
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.
This system includes distributor, Camshaft Position (CMP) sensor, ignition coil with Ignition Control Module (ICM), secondary wires, spark plugs, Knock Sensors (KS) and Crankshaft Position (CKP) sensor. The ignition system is controlled by Powertrain Control Module (PCM). PCM monitors information from various engine sensors, computes desired spark timing, and controls dwell and firing of ignition coil via an IC line to IC module.