Throttle Position Sensor: Testing and Inspection
THROTTLE POSITION SENSOR INSPECTIONClosed throttle position switch
1. Verify that the throttle valve is at the 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 no continuity, adjust the throttle position sensor.
5. Insert a O.5O mm (0.020 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.
Throttle Position Sensor
Using SSTs (Engine Signal Monitor)
1. Remove the Powertrain Control Module (PCM).
SST:
2. Connect the Special Service Tools (SST)s to the PCM.
3. Verify that the throttle valve is at the closed throttle position.
4. Turn the ignition switch to ON.
5. Measure the PCM terminal 3B voltage by using a voltmeter.
Specifications:
Closed throttle position: 0.1-1.1 V
Wide open throttle: 2.8-4.5 V
(Verify that the voltage increase Is directly proportioned to the throttle valve opening angle.)
6. If not as specified, adjust the throttle position sensor.
Using SST (NGS)
NGS Connected To DLC-2:
1. Connect the Special Service Tools (SST)s New Generation Star (NGS) tester to the data link connector-2.
2. Verify that the throttle valve is at the closed throttle position.
3. Turn the ignition switch to ON.
4. Select the PID/DATA MONITOR AND RECORD function of the NGS.
5. Select "TP V" on the NGS display. NGS measures and shows the voltage.
Specifications:
Closed throttle position: 0.1-1.1 V
Wide open throttle: 2.8-4.5 V
(Verify that the voltage increase is directly proportioned to the throttle valve opening angle)
6. 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
1. Verify that the throttle valve is at the closed throttle position.
2. Disconnect the throttle position sensor connector.
3. Loosen the attaching screws.
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.
5. Tighten the attaching screws.
Tightening torque: 1.6-2.3 Nm (14-20 in.lbs.)
6. If not adjusted, replace the throttle position sensor. (Refer to below.)
THROTTLE POSITION SENSOR
Using SSTs (Engine Signal Monitor)
1. Remove the PCM.
2. Connect the SSTs to the PCM.
3. Verify that the throttle valve is at the closed throttle position.
4. Loosen the attaching screws.
5. Turn the ignition switch to ON.
6. Adjust the throttle position sensor so that the PCM terminal 3B voltage is as specified, by using a voltmeter.
Specifications:
Closed throttle position: 0.1-1.1 V
Wide open throttle: 2.8-4.5 V
(Verify that the voltage increase is directly pro-portioned to the throttle valve opening angle.)
7. Tighten the attaching screws.
Tightening torque: 1.6-2.3 Nm (14-20 in.lbs.)
8. If not adjusted, inspect the throttle position sensor harness.
9. If harness is OK, replace the throttle position sensor.
Using SST (NGS)
1. Connect the SSTs to the data link connector-2.
2. Verify that the throttle valve is at the closed throttle position.
3. Loosen the attaching screws.
4. Turn the ignition switch to ON.
5. Select the PID/DATA MONITOR AND RECORD function of the NGS.
6. Select "TP V", on the NGS display. NGS measures and shows the voltage.
Specifications:
Closed throttle position: 0.1-1.1 V
Wide open throttle: 2.8-4.5 V
(Verify that the voltage increase is directly proportioned to the throttle valve opening angle.)
7. Tighten the attaching screws.
Tightening torque: 1.6-2.3 Nm (14-20 in.lbs.)
8. If not adjusted, replace the throttle position sensor.