Off Vehicle Inspection

THROTTLE BODY INSPECTION




1. CLEAN THROTTLE BODY.
- Using a soft brush and carburetor cleaner, clean the cast parts.
- Using compressed air, clean all the passages and apertures.

NOTICE: To prevent deterioration, do not clean the throttle position sensor and dash pot.





2. INSPECT THROTTLE VALVE AND THROTTLE POSITION SENSOR.
- Inspect throttle valve
- Disconnect the vacuum hose from the throttle opener.
- Apply vacuum to the throttle opener.
- Check that there is no clearance between the throttle stop screw and throttle lever when the throttle valve is fully closed.
- Reconnect the vacuum hose to the throttle opener.





- Inspect throttle position sensor
- Insert a 0.40 mm (0.016 in.) or 0.65 mm (0.026 in.) feeler gauge between the throttle stop screw and stop lever.





- Using an ohmmeter, measure the resistance between each terminal.





- If necessary, adjust throttle position sensor
- Loosen the 2 set screws of the sensor.





- Insert a 0.40 mm (0.01 6 in.) feeler gauge between the throttle stop screw and stop lever.
- Connect the tester probe of an ohmmeter to terminals IDL1 and E2 of the sensor.





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








- Recheck the continuity between terminals IDL1 and E2.





3. w/TRAC:
INSPECT SUB-THROTTLE ACTUATOR, SUB-THROTTLE VALVE AND SUB-THROTTLE POSITION SENSOR.
- Inspect sub - throttle actuator
- Using an ohmmeter, measure the resistance between the terminals (ACM ~ A and A-, BCM ~ B and B-).

Resistance: At 20°C (68°F) 0.8 - 1.0 0hms

- If the resistance is not as specified, replace the actuator valve.
- Inspect sub-throttle actuator





- Remove the 3 screws and sub-throttle actuator.





- Inspect sub-throttle valve
- Check that there is no clearance between the throttle stop screw and throttle valve gear when the sub- throttle valve is fully closed.








- Inspect sub-throttle position sensor
- Insert a 0.30 mm (0.012 in.) or 0.50 mm (0.020 in.) feeler gauge between the throttle stop screw and throttle valve gear.
- Using an ohmmeter, measure the resistance between each terminal.
- If necessary, adjust sub-throttle position sensor





- Loosen the 2 set screws of the sensor.





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





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








- Recheck the continuity between terminals IDL2 and E2.
- Reinstall sub-throttle actuator
- Install the sub-throttle actuator with the 3 screws.