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Home >> GMC >> 1998 >> Forward Control 7.4 B >> Repair and Diagnosis (Single Page) >> Engine Performance >> Remove, Overhaul & Install >> Engine Controls - Remove/Install/Overhaul - 7.4L >> Computerized Engine Controls >> Powertrain Control Module (Pcm) >> Removal
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Powertrain Control Module (Pcm): Removal

Ensure ignition switch is in OFF position. Disconnect negative battery cable. Unplug harness connectors from PCM. Remove PCM from vehicle. Remove access cover and remove knock sensor module from PCM.

NOTE: After installation of a NEW PCM, Malfunction Indicator Light (MIL) will remain on until PCM is programmed.
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