Throttle Position Sensor (TPS)

THROTTLE POSITION SENSOR

Description
The throttle position sensor is a rotating type variable resistor that rotates with the throttle body throttle shaft to sense the throttle valve angle. As the throttle shaft rotates, the output voltage of the throttle position sensor changes and the engine control module detects the throttle valve opening based on the change of the voltage.





Circuit Diagram

Troubleshooting Hints
The throttle position sensor signal is important in the control of automatic transaxle. Shift shock and other troubles will occur if the sensor is faulty.





Using Scan Tool











Harness Inspection Procedures





Sensor Inspection

1. Disconnect the throttle position sensor connector.
2. Measure resistance between terminal 1 (sensor ground) and terminal 4 (sensor power).

Standard value: 3.5 - 6.5 k ohms

3. Connect a pointer type ohmmeter between terminal 1 (sensor ground) and terminal 3 (sensor output).
4. Operate the throttle valve slowly from the idle position to the full open position and check that the resistance changes smoothly in proportion with the throttle valve opening angle.
5. If the resistance is out of specification, or fails to change smoothly, replace the throttle position sensor.