Throttle Position Sensor: Adjustments

Throttle Position Sensor Circuit:

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.

Requirements before adjustment:

a. Engine fully warmed up. (185°-205° F)
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)

Accelerator Cable Adjustment Bolts:

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.
2. Using a high-impedance digital voltmeter, carefully back probe the throttle position connector into terminals 2 and 3.
3. Turn the key to the ON position.
4. Check the output voltage of the TPS.

Voltage
0.48-0.52 VDC

If necessary, adjust the TPS by loosening the mounting screws and rotating the sensor. 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.