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Home >> GMC >> 1995 >> Forward Control 4.3 Z, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - System/Component Tests - 4.3L. >> Ignition System >> Timing Control Systems (C-4 & C-5) >> C-4, Ignition Control Circuit
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C-4, Ignition Control Circuit

An open or short to ground in Ignition Control (IC) or by-pass circuit will cause ECM/PCM/VCM to turn on Malfunction Indicator Light (MIL) and confirm fault by setting a related trouble code. Refer to the TESTS W/CODES - 4.3L article.