Throttle Position Sensor: Testing and Inspection

INSPECTION
- Connect the Special Service Tools (SST)s (Engine Signal Monitor) to the PCM.
- Verify that the throttle valve is at the closed throttle position.
- Turn the ignition switch to ON.
- Measure the voltage at PCM terminal 3F.

Specification:
Closed throttle position: 0.3 - 1.0 V
Wide open throttle: 2.8 - 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 New Generation Star (NGS) tester 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: 0.3 - 1.0 V
Wide open throttle: 2.8 - 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.




- Connect the SSTs (Engine Signal Monitor) to the PCM.
- 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 PCM terminal 3F voltage is as specified.

Specification
Closed throttle position: O.5 - 0.6 V

- Tighten the attaching screws.

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

- Fully open the throttle valve and verify that the voltage is with in the specification.

Specification
Wide open throttle: 2.8 - 4.5 V
(Verify that the voltage increase is directly pro- portioned to the throttle valve opening angle.)

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

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




- Select the PID/DATA MONITOR AND RECORD function.
- Verify that the throttle valve is at the closed throttle position.
- Loosen the attaching screws.
- Select the "TP V", on the NGS display.
- Adjust the throttle position sensor so that the throttle position signal voltage is as specified.

Specification
Closed throttle position: 0.5 - 0.6

- Tighten the attaching screws.

Tightening torque: 1.6 - 2.3 Nm (14 - 2O in. lbs.)

- Fully open the throttle valve and verify that the voltage is with in the specification.

Specification
Wide open throttle: 2.6 - 4.5 V
(Verify that the voltage increase is directly proportioned to the throttle valve opening angle.)

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