Component Inspection

THROTTLE BODY INSPECTION

1. CLEAN THROTTLE BODY
(a) Using a soft brush and carburetor cleaner, clean the cast parts.





(b) Using compressed air, clean all the passages and apertures.

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

2. INSPECT THROTTLE VALVE AND THROTTLE POSITION SENSOR
A. Inspect throttle valve





(a) Disconnect the throttle opener vacuum hose from the throttle body.
(b) Apply vacuum to the throttle opener.
(c) Check that there is no clearance between the throttle stop screw and throttle lever when the throttle valve is fully closed.
(d) Reconnect the throttle opener vacuum hose to the throttle body.
B. inspect throttle position sensor
C. If necessary, adjust throttle position sensor





(a) Loosen the 2 set screws of the sensor.





(b) Insert a 0.50 mm (0.020 in.) feeler gauge between the throttle stop screw and stop lever.
(c) Connect the test probe of an ohmmeter to the terminals IDL1 and E2 of the sensor.





(d) Gradually turn the sensor clockwise until the ohmmeter deflects and secure it with the 2 set screws.








(e) Recheck the continuity between terminals IDL1 and E2.
3. w/TRAC:
INSPECT SUB-THROTTLE ACTUATOR, SUB-THROTTLE VALVE AND SUB-THROTTLE POSITION SENSOR





A. Inspect sub-throttle actuator
Using an ohmmeter, measure the resistance between the terminals (ACM ~ A and A-, BCM ~ B and B-).

Resistance: 0.5 - 1.00 at 20°C (68°F)

If the resistance is not as specified, replace the actuator valve.





B. Inspect sub-throttle actuator
Remove the 3 screws and sub-throttle actuator.





C. 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.








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





(a) Loosen the 2 set screws of the sensor.





(b) Insert a 0.40 mm (0.016 in.) feeler gauge, between the throttle stop screw and throttle valve gear.
(c) Connect the test probe of an ohmmeter to the terminals IDL2 and E2 of the sensor.
(d) Set that the sub-throttle valve is fully closed.





(e) Gradually turn the sensor clockwise until the ohmmeter deflects and secure it with the 2 set screws.








(f) Recheck the continuity between terminals IDL2 and E2.
F. Reinstall sub-throttle actuator
Install the sub-throttle actuator with the 4 screws.