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Home >> GMC >> 1994 >> Forward Control 7.4 N >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 7.4L >> Self-Diagnostic System >> Clearing Trouble Codes
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Clearing Trouble Codes

Turn ignition switch to ON position and ground diagnostic test terminal "B" at DLC. See Figure. Turn ignition switch to OFF position and remove ECM fuse from fuse block for 10 seconds. Replace fuse. Remove diagnostic terminal ground lead. Codes may also be cleared using the General Motors Tech 1 scan tester.

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