Throttle Position Sensor: Service and Repair

THROTTLE BODY REMOVAL

1. Lower the level of the engines coolant to below the intake manifold, by draining a partial amount into a clean container.

Throttle Body Removal:

2. Installation procedures are the reverse of the removal procedures.
NOTE: When installing the new gasket, be sure its projections are facing upward.

3. Refill the engine's coolant to the proper level.

THROTTLE BODY DISASSEMBLY

Exploded View Of The Throttle Body:

CAUTION:
a. Do NOT remove the throttle valve.
b. When loosening a Phillips screw which has been tightened firmly, be sure to use a screwdriver that is an exact fit.
c. Be careful while removing the Throttle Position Sensor screw and the ISC servo screw. They have been coated with an adhesive.


INSTALLATION OF THE TPS TO THE THROTTLE BODY

TPS Temporarily Mounted:

1. Install the TPS on the throttle body and temporarily tighten the screws.

TPS Electrical Connector:

CAUTION: Any adjustments to the TPS or the ISC should be done according to the load on the engine.

2. Connect an ohmmeter to terminals # 1 and # 2 of the TPS connector.

3. Verify that the resistance changes smoothly as the throttle valve is fully opened and closed slowly.

4. Connect the ohmmeter to terminal # 2 and terminal # 4 of the TPS connector.

5. Verify that the resistance changes smoothly as the throttle valve is fully opened and closed slowly.
If resistance changes smoothly, then the TPS has been installed correctly.