Throttle Body Inspection

ON-VEHICLE INSPECTION
1. CHECK THROTTLE BODY
(a) Check that the throttle linkage moves smoothly.




(b) Check the vacuum at each port.
- Start the engine.
- Check the vacuum with your finger.




Specifications




2. CHECK THROTTLE POSITION SENSOR
Check the resistance between the terminals.
- Unplug the connector from the sensor.
- Insert a thickness gauge between the throttle stop screw and stop lever.
- Using an ohmmeter, check the resistance between each terminal.




REMOVAL OF THROTTLE BODY
1. DRAIN COOLANT FROM THROTTLE BODY
2. REMOVE AIR INTAKE CONNECTOR
3. DISCONNECT THROTTLE POSITION SENSOR AND ISC VALVE CONNECTORS
4. DISCONNECT FOUR VACUUM HOSES




5. DISCONNECT NO.1 AND NO.2 WATER BY-PASS HOSES
6. (AlT) DISCONNECT TTHROTTLECABLE
7. DISCONNECT ACCELERATOR CABLE AND BRACKET




8. REMOVE THROTTLE BODY
Remove the two bolts and two nuts, and remove the throttle body and the gasket.




INSPECTION OF THROTTLE BODY
1. CLEAN THROTTLE BODY BEFORE INSPECTION
(a) Wash and clean the cast parts with a soft brush and carburetor cleaner.
(b) Using compressed air, clean all the passages and apertures in the throttle body.

NOTICE: To prevent deterioration, do not clean the throttle position sensor and ISC valve.




2. CHECK THROTTLE VALVE
Check that there is no clearance between the throttle stop screw and throttle lever when the throttle valve is fully closed.




3. CHECK THROTTLE POSITION SENSOR




4. IF NECESSARY, ADJUST THROTTLE POSITION SENSOR
(a) Loosen two screws of the sensor.




(b) Insert a thickness gauge (0.83 mm, 0.0325 in.) between the throttle stop screw and lever, and connect the ohmmeter to terminals IDL and E2.




(c) Gradually turn the sensor clockwise until the ohmmeter deflects, and secure the sensor with two screws.
(d) Using a thickness gauge, recheck the continuity between terminals IDL and E2.




5. IF NECESSARY, REPLACE THROTTLE POSITION SENSOR
(a) Remove the two screws and throttle position sensor.




(b) Check that the throttle valve is fully closed.
(c) Place the sensor on the throttle body as shown in the figure.
(d) Turn the throttle position sensor, and temporarily install the two screws.
(e) Adjust the throttle position sensor.




INSTALLATION OF THROTTLE BODY
1. INSTALL THROTTLE BODY
(a) Place a new gasket on the intake manifold.
(b) Install the throttle body with two nuts and two bolts.

Torque: 185 kg/cm (13 ft.lbs., 18 Nm)

2. CONNECT ACCELERATOR CABLE
3. (AlT) CONNECT THROTTLE CABLE
4. CONNECT NO.1 AND NO.2 WATER BY-PASS HOSES
5. CONNECT FOUR VACUUM HOSES
6. CONNECT THROTTLE POSITION SENSOR AND ISC VALVE CONNECTORS
7. INSTALL AIR INTAKE CONNECTOR
8. F1LL WITH COOLANT