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The throttle position sensor measures the angle of the throttle valve in gasoline engines. The signal of the throttle position sensor is used to more precisely calculate the fuel injection quantity.
Bosch's throttle position sensor is a potentiometer with a linear characteristic curve. The rotor arm, which is connected to the throttle valve shaft, moves its wipers along the resistance tracks. This translates the angle of the throttle valve into a proportional voltage ratio.
Throttle position sensors are built directly onto the throttle housing, along with an extended throttle valve shaft. To function in such extreme situations, the sensors are resistant to substances such as fuel, oil, salt spray, and industrial conditions.