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Electronic Ignition System Diagnosis: Description

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Electronic ignition system uses an individual ignition coil for each cylinder. PCM controls ignition operation through 6 Ignition Control (IC) circuits. Each ignition coil is connected to PCM, power, or ground by the following circuits:

PCM triggers an ignition coil by grounding appropriate IC Control circuit using information from Crankshaft Position (CKP) and Camshaft Position (CMP) sensors.

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