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Home >> GMC >> 1985 >> Forward Control 7.4 W, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Diesel CEC Tests W/Codes >> Clearing Trouble Codes
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Clearing Trouble Codes

Trouble codes should be cleared when indicated in Diagnostic Circuit Check chart, and after the repair of a circuit. To clear trouble codes, the fused 12-volt source to ECM must be disconnected for 10 seconds by disconnecting the positive battery terminal or removing the "ECM B" fuse at the fuse panel.