Component Test

TPS / IAC Motor Location:

The throttle position sensor (TPS) can be tested with a digital voltmeter. The sensor must be checked on the vehicle with its three wire connector engaged to the sensor. The center terminal wire of the sensor connector is the output terminal.

1. Remove the air filter housing assembly.
2. Carefully attach a paper clip into the center terminal of the sensor harness.
3. Attach the positive (+) lead of the voltmeter to this paper clip.
4. Attach the negative (-) lead of the voltmeter to a good ground.

With the ignition key in the ON position and engine not running, check the sensor output voltage at the center terminal wire of the connector. Check this at idle (throttle plate closed) and at wide open throttle (WOT). At idle, sensor output voltage should be greater than 200 millivolts. At wide open throttle, sensor output voltage must be less than 4.8 volts. The output voltage should increase gradually as the throttle plate is slowly opened from idle to WOT.