Electronic Ignition System Diagnosis (4.3L, 5.0L & 5.7L): Description

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.