Throttle Position Sensor: Testing and Inspection

INSPECTION

1. Inspect Throttle Position Sensor.








- Insert a thickness gauge between the throttle stop screw and stop lever.
- Using an ohmmeter measure the resistance between each terminal.





2. If necessary, adjust Throttle Position Sensor.





- Loosen the 2 set screws of the sensor.





- Insert a 0.40 mm (0.016 in.) thickness gauge. between the throttle stop screw and stop lever.
- Connect the test probe of an ohmmeter to the terminals IDL1 and E2 of the sensor.





- Gradually turn the sensor clockwise until the ohmmeter deflects, and secure the sensor with the 2 set screws.





- Recheck the continuity between terminals IDL1 and E2.

With 0.40 mm (0.016 in) clearance between lever and stop screw you should measure continuity.
With 0.65 mm (0.026 in) clearance between lever and stop screw you should measure NO continuity.





3. Inspect Sub Throttle Position Sensor, Sub Throttle Actuator and Sub Throttle Valve (vehicles with TRAC only).
- Inspect Sub Throttle Actuator. Using an ohmmeter measure the resistance between the terminals ACM and A, ACM and A-, BCM and B, BCM and B-.

Resistance: 0.5 - 1.0 ohms

- If the resistance is not as specified, replace the Actuator.








- Inspect the Sub Throttle Valve. Remove the 3 screws and remove and Sub Throttle Actuator. Verify that there is no clearance between the throttle stop screw and throttle gear when the Sub Throttle Valve is fully closed.








- Inspect Sub Throttle Position Sensor. Insert a 0.30 mm (.012 in) / 0.50 mm (0.020 in) feeler gauge between the throttle stop screw and Throttle Valve gear.





- Using an ohmmeter, measure the resistance between terminals as indicated below.





4. If necessary, adjust the Sub Throttle Position Sensor (vehicles with TRAC only).
- Loosen the 2 set screws of the sensor.
- Apply vacuum to the Throttle Opener.





- Insert a 0.30 mm (0.012 in.) thickness gauge between the throttle stop screw and Throttle Valve gear.
- Connect the test probe of an ohmmeter to the terminals IDL2 and E2 of the sensor.





- Gradually turn the sensor clockwise until the ohmmeter deflects, and secure the sensor with the 2 set screws.





- Recheck the continuity between terminals IDL2 and E2.

With 0.30 mm (0.012 in) clearance between lever and stop screw you should measure continuity.
With 0.50 mm (0.020 in) clearance between lever and stop screw you should measure NO continuity.





5. Reinstall the Sub Throttle Actuator with the 3 screws (vehicles with TRAC only).