Throttle Position Sensor: Service and Repair

REMOVAL OF THROTTLE BODY

1. REMOVE AIR INTAKE CONNECTOR
2. DRAIN COOLANT FROM THROTTLE BODY
3. DISCONNECT FOLLOWING HOSES:
(a) No.1 and No.2 water by-pass hoses
(b) PCV hose from the throttle body
(c) Label and disconnect emission control hoses

4. DISCONNECT THROTTLE SENSOR CONNECTOR

5. REMOVE THROTTLE BODY
- Remove the four bolts and remove the throttle body and gasket.

INSPECTION OF THROTTLE BODY
1. CLEAN THROTTLE BODY BEFORE INSPECTION
(a) Wash and clean the cast parts with a soft brush in carburetor cleaner.

(b) Using compressed air, blow all passages and apertures in the throttle body.

CAUTION: To prevent deterioration, do not clean the throttle position sensor.

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. ADJUST THROTTLE POSITION SENSOR

(a) Loosen the two screws of the sensor.

(b) Connect the ohmmeter to the throttle position sensor terminals IDL and E2.

(c) Insert a thickness gauge (0.50 mm or 0.0197 in.) between the throttle stop screw and lever. Gradually turn the sensor clockwise until the ohm- meter deflects, and secure the sensor with two screws.

(d) Using a thickness gauge, recheck the continuity between terminals IDL and E2.

REPLACEMENT OF THROTTLE POSITION SENSOR
1. REMOVE THROTTLE POSITION SENSOR

Remove two screws and the sensor from the throttle body.

2. INSTALL THROTTLE POSITION SENSOR
(a) Check that the throttle valve is fully closed.
(b) Place the sensor on the throttle body as shown in the figure.

(a) Loosen the two screws of the sensor.

(b) Connect the ohmmeter to the throttle position sensor terminals IDL and E2.

(d) Using a thickness gauge, recheck the continuity between terminals IDL and E2.