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Home >> GMC >> 1994 >> Forward Control 7.4 N >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> Engine Controls - Remove/Install/Overhaul >> Powertrain Control Module (Pcm) >> Control Unit >> Removal

Control Unit: Removal

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