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Home >> GMC >> 1993 >> Forward Control 7.4 N >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - V6 >> Self-Diagnostic Tests >> Code 26, Quad-Driver Circuit 3.8L >> QDM Symptoms:

QDM Symptoms:

Puller fan on all the time or will not come on at all.
TCC does not engage.
Poor driveability due to 100 percent canister purge.

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