Throttle Position Sensor: Adjustments

CAUTION: Before attempting to adjust the Throttle Sensor, make certain the idle speed and ignition timing are correctly adjusted. See this section for the proper procedures.

Adjustment requirements:
a. Engine fully warmed up. (185-205F deg)
b. All lights, engine cooling fan and accessories "off".
c. Transmission in P or N.
d. Steering wheel in the straight ahead position (models with power steering only)
1. Verify that the throttle cable has enough slack that it is not holding the throttle open in any way. Loosen the adjustment bolts for the throttle cable if necessary.

TPS Multimeter Test, ECU Hook-up:

2. If the multi-use tester is not used, use a digital-type voltmeter to back probe terminal 24 and terminal 19 of the ECU.
3. With the key on, engine off, check the output voltage of the TPS.

Voltage:
0.48 - 0.52 volts

Throttle Position Sensor (TPS):

4. If the sensor's output is not within specification, adjust the TPS by loosening the mounting screws and rotating the sensor.
NOTE: Clockwise rotation of the sensor increases the voltage output while counter-clockwise rotation reduces voltage.

5. Tighten the sensor set screws securely.
6. Turn the ignition switch OFF.
7. Disconnect the battery for at least ten seconds to clear any stored trouble codes.
8. If the throttle cable was previously loosened, return the cable to the proper adjustment.