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Home >> GMC >> 1986 >> Forward Control 6.2 J, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (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 Yukon, 1994 GMC Suburban, 1994 GMC Pickup, 1994 GMC Cab & Chassis, and 1994 GMC C3500 HD. 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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