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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 140 (Engine Controls - System & Component Testing) >> Ignition System >> Electronic Ignition System Diagnosis (4.8L, 5.3L, 6.0L & 8.1L) >> Circuit Description

Circuit Description

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The electronic ignition system uses an individual ignition coil for each cylinder. Powertrain Control Module (PCM) controls ignition operation through 8 individual Ignition Control (IC) circuits. Each bank of 4 ignition coils is connected to PCM, power, or ground by the following circuits:

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