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Home >> GMC >> 1999 >> Yukon Base, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Component Tests >> Ignition System >> Timing Control Systems >> Ignition Control Circuit (Gasoline Engines)
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Ignition Control Circuit (Gasoline Engines)

An open or short to ground in Ignition Control (IC) or by-pass circuit will cause PCM/VCM to turn on Malfunction Indicator Light (MIL) and confirm fault by setting a related DTC. See appropriate SELF-DIAGNOSTICS article.