Throttle Position Sensor: Adjustments

NOTE: Before attempting to adjust the Throttle Sensor, make certain the idle speed and ignition timing are correctly adjusted. See IDLE SPEED and IGNITION TIMING for the proper procedures.

1. Verify the following conditions:
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)

Fig. 74 Loosening Accelerator Cable:

2. 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.

Throttle Position Sensor Terminals:

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

Voltage
0.48 - 0.52 volts

Throttle Position Sensor Screws:

If the voltage is not as specified, 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.

6. Torque the screws to:
Torque value:
1.1 - 1.8 ft.lbs. (1.5 - 2.5 Nm)

7. Turn the ignition switch OFF.
8. Disconnect the battery for at least ten seconds to clear any stored trouble codes.
9. If the throttle cable was previously loosened, return the cable to the proper adjustment.