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. Remove the accelerator cable mounting bolts and disconnect it from the throttle body.
3. Disconnect the vacuum hoses and the air intake hose from the throttle body.
4. Disconnect the TPS and the ISC Servo electrical connectors.
5. Disconnect the water hoses.
6. Remove the throttle body attaching bolts.
Make a note of the lengths of each bolt and their designated hole.
NOTE: a. Installation is the reverse of removal.
b. Be sure to refill the engine's coolant to the proper level.
THROTTLE BODY DISASSEMBLY
TPS & ISC Removal:
1. Remove the Throttle Position Sensor/Idle Switch attaching bolts.
2. Remove the TPS.
3. Remove the ISC Servo assembly attaching bolts.
4. Remove the ISC Servo assembly.
5. Remove the Fixed Idle Speed Adjusting Screw and lock nut.
NOTE: Assembly procedures are the reverse of disassembly.
INSTALLATION OF THE TPS TO THE THROTTLE BODY
Positioning The TPS:
1. Set the TPS to the throttle body at a 90~ angle.
Adjusting The TPS:
2. Turn the TPS 90~ counterclockwise to set it, then lightly tighten the screws.
Rechecking The TPS:
3. Connect an ohmmeter to terminal # 1 and terminal # 3 of the TPS connector.
4. Verify that the resistance changes smoothly as the throttle valve is opened and closed slowly.
5. Connect the ohmmeter to terminal # 3 and terminal # 4 of the TPS connector.
6. Verify that the resistance changes smoothly as the throttle valve is opened and closed slowly.
7. Check for continuity between terminals # 2 and # 1,
^ While the throttle valve is fully closed - continuity
^ While the throttle valve is fully opened - no continuity
8. If there is not continuity with the throttle valve fully closed, turn the TPS in a clockwise direction and then recheck.
If the TPS does not meet specifications, remove and replace the TPS.
NOTE: Be sure to torque the TPS screws to specifications once the tests are completed. Refer to SPECIFICATIONS/MECHANICAL