Throttle Position (TP) Sensor & Idle Switch

TP sensor is attached to throttle body housing and is actuated by movement of accelerator pedal. TP sensor has a potentiometer which varies output voltage in response to changes in throttle position. This information is relayed to PCM in form of an input voltage signal on 3-terminal TP sensor harness. TP sensor also has ability to inform PCM of rate of changes taking place in throttle plate movement. Wide open and closed throttle position switch, built into TP sensor, is not used for engine control.