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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 218 (Engine Controls - Basic Diagnostic Procedures - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline Engines) >> Ignition Systems >> Electronic Ignition System Diagnosis >> Circuit Description

Circuit Description

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The electronic ignition system uses an individual ignition coil for each cylinder. The 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 low reference, chassis ground, ignition 1 voltage circuits and appropriate IC circuit. PCM triggers an ignition coil by grounding appropriate IC circuit using information from Crankshaft Position (CKP) and Camshaft Position (CMP) sensors. The CMP sensor is located on top center rear of engine and CKP sensor is located on engine block, near starter. See Figure or Figure .

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