Throttle Position Sensor: Testing and Inspection

Inspection/Variable Resistor




1. Connect the Special Service Tools (SSTs) to the Engine Control Module (ECM).
2. Verify that the throttle valve is closed throttle position.
3. Turn the ignition switch ON.




4. Measure the ECM terminal 2M voltage.

Specification
Closed throttle position: 0.1-1.0 V
Wide open throttle: 3.6-5.0 V
(Verify that the voltage increases directory proportioned to the throttle valve opening angle.)

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

Inspection/Closed Throttle Position Switch
1. Verify that the throttle valve is closed throttle position.
2. Disconnect the throttle position sensor connector.







3. Check for continuity between throttle position sensor connector terminals (C) and (D) by using an ohmmeter.
4. If there is no continuity, adjust the throttle position sensor.




5. Insert a 0.70 mm (0.028 in) feeler gauge between the throttle adjusting screw (TAS) and the throttle lever verify that there is no continuity.
6. If there is continuity, adjust the throttle position sensor. (Refer to "Adjustments" below.)

Adjustments

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.

Adjustment/Throttle Position Sensor (Variable Resistor)
1. Connect the SSTs to the ECM.
2. Verify that the throttle valve is closed throttle position.




3. Loosen the attaching screws.
4. Turn the ignition switch to ON.
5. Adjust the throttle position sensor so that the ECM terminal 2M voltage is as specified.

Specification
Closed throttle position: 0.1-1.0 V
Wide open throttle: 3.6-5.0 V
(Verify that the voltage increase is directory pro- portioned to the throttle valve opening angle.)

6. Tighten the attaching screws.

Tightening Torque: 2.0-2.3 Nm (18-20 in.lb.)

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

Adjustment/Closed Throttle Position Switch
1. Verify that the throttle valve is closed throttle position.
2. Disconnect the throttle position sensor connector.
3. Loosen the attaching screw.




4. Insert a feeler gauge between the throttle adjusting screw (TAS) and the throttle lever. Adjust the continuity between the closed throttle position switch terminals C and D by using an ohmmeter.





Specification

5. Tighten the attaching screws.

Tightening Torque: 2.0-2.3 Nm (18-20 in.lb.)

6. If not adjusted, replace the throttle position sensor.