Position sensor is a potentiometer with one or two characteristic curves. Applications:
– throttle position sensor
– accelerator pedal position sensor
– air flow sensor
– EGR valve position sensor
– fuel level sensor
– transmission range sensor

Typical location of the throttle position sensor.

Connection of the USB Autoscope IV to the sensor signal wire.

Setting the USB Autoscope IV to the throttle position sensor testing mode.

Output voltage waveform of the throttle position sensor in good condition on a Mitsubishi Lancer 1.6 2005, recorded with the ignition on and the engine off while smoothly opening and closing the throttle.

Output voltage waveform of the dual throttle position sensor in good condition on a Toyota Avensis 1.8i 2007, recorded with the ignition on and the engine off while smoothly opening and closing the throttle.

Output voltage waveform of a malfunctioning throttle position sensor with a malfunction, recorded with the ignition on and the engine off while smoothly opening and closing the throttle.

Output voltage waveform from a properly functioning throttle position sensor (Mitsubishi Lancer 1.6 2005).
A B – throttle valve opening;
C D – throttle valve closing.

Output voltage waveforms from a properly functioning throttle position sensor (Toyota Avensis 1.8i 2007).

Output voltage waveforms from a properly functioning throttle position sensor (VW Passat 1.8TSI 2008).

Output voltage waveforms from a properly functioning throttle position sensor (VW Passat 1.8 1991).

Output voltage waveform from a malfunctioning throttle position sensor. The resistor track is worn and the wiper loses electrical contact in certain positions.

Output voltage waveform from a malfunctioning throttle position sensor. The resistor track is worn and the wiper loses electrical contact in certain positions.