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Home >> Volkswagen >> 1993 >> Passat GL, 2.0 C, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation - VR6 >> Computerized Engine Controls >> Input Devices >> Throttle Valve Potentiometer
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Throttle Valve Potentiometer

Throttle valve potentiometer (throttle position sensor) is connected to throttle valve shaft. It informs the ECM about the power requested by the driver (throttle opening). Idle and full throttle switches are NOT used in potentiometer. Idle speed and full throttle applications are recognized by the ECM from the voltage output of the potentiometer.

Throttle valve potentiometer signals are used for idle speed stabilization, idle air volume control, fuel after-run shut-off, and full throttle enrichment. The ECM uses mass airflow sensor signal and engine RPM signals as substitute values if the potentiometer fails.

NOTE: On automatic transmission equipped vehicles, the throttle valve potentiometer is combined in the housing with the potentiometer for transmission control.
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