Impreza WRX F4-2.0L DOHC Turbo (2004)
Throttle Position Sensor: Description and Operation
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The throttle position sensor is mounted in the throttle body and linked to the throttle valve.
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The throttle position sensor sends the ECM voltage signal corresponding to the opening of the throttle valve. When the sensor's output voltage
exceeds a predetermined level, the ECM interprets it as complete closure of the throttle valve. When the output voltage is at another predetermined
level, the ECM recognizes that the throttle valve is at a wide open position. Since the output characteristics of the sensor change over years, the
ECM is provided with a learning function to be able to interpret signals into throttle valve angles always correctly.
