Throttle Position (TP) Sensor

TP sensor is mounted on throttle body and monitors opening angle of throttle valve. It is a variable resistor operated by the opening and closing of throttle plate. PCM uses TP sensor input signal to determine throttle position under all operating conditions and adjusts fuel injector pulse width and ignition timing accordingly.

PCM supplies a 5-volt reference signal to TP sensor. TP sensor output voltage (input signal to PCM) represents throttle blade position. TP sensor output voltage varies from one volt at minimum throttle opening (idle) to 4 volts at wide open throttle.