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Home >> GMC >> 1985 >> Forward Control 5.7 M, Standard >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> CCC Component Removal & Installation >> Removal & Installation >> Electronic Control Module (ECM) >> Removal
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Electronic Control Module (ECM): Removal

Turn ignition switch off. Disconnect negative battery cable from battery. Locate ECM and remove access panels, if any. Remove electrical connectors from ECM. Remove ECM from vehicle. Remove PROM and CALPAC (if equipped) from ECM.

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