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Home >> GMC >> 2003 >> Jimmy 4D Utility, 4WD, Part Time >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation - 4.3L >> Computerized Engine Controls >> Input Devices >> Transmission Fluid Pressure Switch
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Transmission Fluid Pressure Switch

The Transmission Fluid Pressure (TFP) switch is actually 5 pressure switches combined into a single unit mounted on transmission valve body. The PCM supplies battery voltage on 3 separate wires to TFP switch. As switches are actuated in various combinations during transmission operation, PCM can detect what gear transmission is in.

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