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Home >> Chevrolet >> 1997 >> Astro Van Cargo, AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation 4.3L >> Computerized Engine Controls >> Input Devices >> Transmission Fluid Pressure (TFP) Switch

Transmission Fluid Pressure (TFP) Switch

The TFP is actually 5 pressure switches combined into a single unit mounted on transmission valve body. The PCM/VCM supplies battery voltage on 3 separate wires to TFP. By grounding one or more of the switches in various combinations, PCM/VCM detects what gear range the vehicle operator has selected.

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