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Home >> Geo >> 1997 >> Prizm Base, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation 1.6 & 1.8L >> Computerized Engine Controls >> Powertrain Control Module (Pcm)
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Powertrain Control Module (Pcm)

Power for PCM is supplied from 15-amp EFI fuse through EFI relay, located in relay/fuse box. PCM memory power is supplied from 15-amp EFI F-HTR fuse. PCM distributes power and controls ground of various sensors, switches and solenoids for engine control. See Figure or Figure .

NOTE: Components are grouped into 2 categories. First category is INPUT DEVICES, which are components that control or produce voltage signals monitored by PCM. Second category is OUTPUT SIGNALS  , which are components controlled by PCM.
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