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Home >> GMC >> 1987 >> Forward Control 7.4 W, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Engine Controls - System/Component Tests - Gasoline) >> Ignition System >> Timing Control Systems (C-4 & C-5) >> C-4, Ignition Control Circuit
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C-4, Ignition Control Circuit

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Vandura Special, 1994 GMC Vandura, 1994 GMC Rally Camper Special, 1994 GMC Rally, and 1994 GMC Forward Control. However, it is still accessible from the selected car via links, so may be relevant.

An open or short to ground in Ignition Control (IC) or by-pass circuit will cause ECM to turn on Malfunction Indicator Light (MIL) and confirm fault by setting a related trouble code. Refer to appropriate G - GASOLINE TESTS W/ CODES article in the ENGINE PERFORMANCE section below.

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