The Throttle Position (TP) sensor is a potentiometer which provides a signal to the Engine Control Module (ECM) that is directly proportional to the throttle plate position.
The TP sensor is mounted to the throttle body and engages the throttle plate. As the throttle plate opens and closes, the resistance of the TP sensor changes and varies the output signal voltage accordingly.
- With ignition ON and engine OFF , measure voltage between sensor VREF and SIG RTN connector terminals. If voltage reading is 4.0-6.0V, the power circuits to the sensor are okay.
- With ignition ON and engine OFF , use DVOM to measure voltage between sensor SIG RTN and TP connector terminals. If the voltage increases smoothly to greater than 3.5V as the throttle plate is moved from idle to wide open throttle, the sensor is okay.