Throttle Position Sensor: Service and Repair
THROTTLE BODY REMOVAL1. 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.
Poor idling may result if the gasket is installed incorrectly.
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. It has been coated with an adhesive.
INSTALLATION OF THE TPS TO THE THROTTLE BODY
TPS:
1. Install the TPS on the throttle body and temporarily tighten the screws.
TPS Connector:
2. Connect an ohmmeter to terminals # 1 and # 3 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 # 3 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.
IDLE POSITION SWITCH CONTINUITY CHECK, after reassembly.
ISC Servo Connector:
6. Check for continuity between terminal # 3 and the ground.
^ While the throttle valve is fully closed - continuity should exist.
^ While the throttle valve is fully opened - continuity should NOT exist.
Replace the Idle Speed Control Servo, if the results differ from above.