Throttle Position Sensor: Service and Repair

INSPECTION
Closed Throttle Position Switch
- Turn the ignition switch to OFF and the throttle valve to the closed throttle position.
- Disconnect the throttle position sensor connector.







- Check continuity between throttle position sensor terminals A and B.




- If not as specified, adjust the throttle position sensor.
- Insert a 0.4 mm {0.016 in} feeler gauge between the stopper and the throttle lever.




- Verify that there is no continuity between the throttle position sensor terminals A and B.
- If there is continuity, adjust the throttle position sensor.

THROTTLE POSITION SENSOR




- Connect the SSTs (Engine Signal Monitor) to the ECM.
- Verify that the throttle valve is at the closed throttle position.
- Turn the ignition switch to ON.
- Measure the voltage at ECM terminal 3E

Specification
Closed throttle position: 0.1 - 1.1 V
Wide open throttle: 3.1 - 4.5 V
(Verify that the voltage increase is directly proportioned to the throttle valve opening angle.)

- If not as specified, adjust the throttle position sensor.

USING THE NGS
- Connect the SSTs (NGS) to the data link connector-2.
- Verify that the throttle valve is at the closed throttle position.




- Select the PID/DATA MONITOR AND RECORD function.
- Select "TP V" on the NGS display. The NGS measures and shows the voltage.

Specification
Closed throttle position: 0.1 - 1.1 V
Wide open throttle: 3.1-4.5 V
(Verify that the voltage increase is directly proportioned to the throttle valve opening angle.)

- If not as specified, adjust the throttle position sensor.

ADJUSTMENT




CAUTION
- The throttle position sensor is adjusted at the factory before shipment. Unnecessary adjustment will negatively effect the engine performance.
- Adjusting the throttle position sensor by using the throttle adjusting screw (TAS) will negatively effect the engine performance.


CLOSED THROTTLE POSITION SWITCH
- Turn the ignition switch to OFF and the throttle valve to the closed throttle position.
- Disconnect the throttle position sensor connector.
- Loosen the throttle position sensor screws.




- Rotate the throttle position sensor and adjust continuity between the sensor terminals A and B as shown.
- Tighten the throttle position sensor screws.

Tightening torque: 1.6 - 2.3 Nm (14 - 20 in lbs.)

THROTTLE POSITION SENSOR




- Connect the SSTs (Engine Signal Monitor) to the ECM.
- Verify that the throttle valve is at the closed throttle position.




- Loosen the attaching screws.
- Turn the ignition switch to ON.
- Adjust the throttle position sensor so that the ECM terminal 3F voltage is as specified.

Specification
Closed throttle position: 0.1 - 1.1 V
Wide open throttle: 3.1 - 4.5 V
(Verify that the voltage increase is directly proportioned to the throttle valve opening angle.)

- Tighten the attaching screws.

Tightening torque: 1.6 - 2.3 Nm (14 - 20 in lbs.)

- If not adjusted, inspect the throttle position sensor harness.
- If the harness is OK, replace the throttle position sensor.




USING THE NGS




- Connect the SSTs (NGS) to the data link connector-2.




- Select the PID/DATA MONITOR AND RECORD function of the NGS.
- Verify that the throttle valve is at the closed throttle position.




- Loosen the attaching screws.
- Select the 'TP V" on the NGS display. The NGS mea measures and shows the voltage.

Specification
Closed throttle position: 0.1 - 1.1 V
Wide open throttle: 3.1 - 4.5 V
(Verify that the voltage increase is directly proportioned to the throttle valve opening angle.)

- Tighten the attaching screws.

Tightening torque: 1.6 - 2.3 Nm (14 - 20 in lbs.)

- If not adjusted, inspect the throttle position sensor harness.
- If the harness is OK, replace the throttle position sensor.




REPLACEMENT
- Disconnect the throttle position sensor connector.
- Remove the attaching screws.
- Remove the throttle position sensor.
- Verify that the throttle valve is fully closed.




- Open the throttle valve slightly and catch the tang of the throttle body on the throttle position sensor plastic tabs. Align tang A on throttle body with tab A on throttle position sensor. Note tangs on the throttle body mate with the tabs on the throttle position sensor on the side of the tab without a slot.
- Position the throttle position sensor on the throttle body so that the mounting holes align.
- Install and hand tighten the attaching screws.
- Release the throttle.




- Adjust the throttle position sensor output voltage and closed throttle position switch.