Off-Vehicle Inspection

THROTTLE BODY COMPONENT INSPECTION

Throttle Body
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 sensors, actuator, dashpot and throttle opener.

2. 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 vacuum hose to the throttle body.


Throttle Position Sensor
1. INSPECT THROTTLE POSITION SENSOR.



(a) Disconnect the throttle opener vacuum hose from the throttle body.
(b) Apply vacuum to the throttle opener.
(c) Insert a 0.54 mm (0.021 in.) or 0.70 mm (0.028 in.) feeler gauge between the throttle stop screw and stop lever.



(d) Using an ohmmeter, measure the resistance between each terminal.



2. IF NECESSARY, ADJUST THROTTLE POSITION SENSOR



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



(b) Insert a 0.65 mm (0.026 in.) feeler gauge between the throttle stop screw and stop lever.
(c) Connect the tester probe of an ohmmeter to the terminals IDL 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 IDL and E2.



(f) Reconnect the vacuum hose to the throttle body.

Sub-Throttle Actuator, Sub-Throttle Valve and Sub-Throttle Position Sensor
1. INSPECT SUB-THROTTLE ACTUATOR.



Using an ohmmeter, measure the resistance between the terminals (ACM to A and A-, BCM to B and B-).

Resistance: 0.82 - 0.98 Ohms at 20°C (68°F)

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

2. REMOVE SUB-THROTTLE ACTUATOR.



Remove the 4 screws and sub-throttle actuator.

3. 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.

4. INSPECT SUB-THROTTLE POSITION SENSOR.



(a) Set the sub-throttle valve to fully closed position.
(b) Insert a 0.41 mm (0.016 in.) or 0.48 mm (0.019 in.) feeler gauge between the throttle stop screw and throttle valve gear.



(c) Using an ohmmeter, measure the resistance between terminals.





5. IF NECESSARY, ADJUST SUB-THROTTLE POSITION SENSOR.



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



(b) Set the sub-throttle valve to fully closed position.
(c) Insert a 0.45 mm (0.018 in.) feeler gauge, between the throttle stop screw and throttle valve gear.



(d) Connect the tester probe of an ohmmeter to the terminals IDL and E2 of the sensor.



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



(f) Recheck the continuity between terminals IDL and E2.

Clearance between
lever and stop screw - (IDL - E2)
0.41 mm (0.018 in.) - Continuity
0.48 mm (0.019 in.) - No continuity

6. REINSTALL SUB-THROTTLE ACTUATOR.



Install the sub-throttle actuator with the 4 screws.