Throttle Position Sensor: Description and Operation

COMPONENT
Throttle Position Sensor (TPS)

FUNCTION
Detects throttle plate opening angle and outputs analog voltage signal to PCM. PCM determines four operating conditions:
1. Closed throttle (idle/deceleration)
2. Part throttle (cruise/acceleration)
3. Wide open throttle (maximum/acceleration)
4. Throttle angle rate

REMARKS
- Uses a rotary potentiometer that is rotated by throttle shaft. As throttle plate is opened or closed, output signal changes linearly.
- If the throttle position sensor or circuit has an open or short, Diagnostic Trouble Code No. P0121, P0122, P0123, P1120, P1121, P1124, or P1125 is output.
- If the throttle position sensor circuit fails, rough idle, poor acceleration or shift shock (AT) may occur.