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Home >> Volkswagen >> 1994 >> Passat 4D Sedan, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> 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 ECM of power requested by driver (throttle opening). Idle and full throttle switches are not used in potentiometer. Idle speed and full throttle applications are recognized by ECM from voltage output of potentiometer.

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

NOTE: On A/T vehicles, throttle valve potentiometer is combined in housing with potentiometer for transmission control.
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