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Home >> GMC >> 1993 >> Jimmy Typhoon >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> Engine Controls - Remove/Install/Overhaul >> Electronic Control Module (ECM) >> Control Unit >> Removal
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Control Unit: Removal

Disconnect negative battery cable. Unplug connectors from ECM. See Figure. Remove ECM from vehicle. Remove PROM and CALPAC (if equipped) or MEM-CAL from ECM. See CALPAC, MEM-CAL, or PROGRAMMABLE READ-ONLY MEMORY (PROM).