Throttle Position Sensor: Testing and Inspection

INSPECTION








Using Scan tool

Check Item: Throttle Position Sensor.
Data Display: Sensor voltage.
Check Conditions: Ignition Switch ON.
- With Throttle Valve at idle position: 450 - 550 m volts.
- With Throttle Valve opening slowly: increases with valve opening.
- With Throttle Valve at wide open position: 4500 - 5500 m volts.

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.

Harness Inspection Procedure





1. Measure the power supply of the Throttle Position Sensor.
- Connector disconnected.
- Ignition Switch ON.
- Voltage should read 4.8 - 5.2 volts.

If OK - go to step 2.
If not OK - Repair the harness (H4 - C50-5 1).





2. Check for continuity of the ground circuit.
- Connector disconnected.

If OK - go to step 3.
If not OK - Repair the harness (H1 - C50-5 12).





3. Check for an open circuit or a short circuit to ground between the Engine Control Module and the Throttle Position Sensor.
- Throttle Position Sensor connector disconnected.
- Engine Control Module connector disconnected.

If OK - END
If not OK - Repair the harness (H3 - C50-5 20)

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.