Throttle Position Sensor: Testing and Inspection

The Throttle Position Sensor (TPS) can be tested with a digital voltmeter. The center terminal of the TPS is the output terminal.

With the ignition key in the ON position, check the TPS 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, TPS output voltage should should be greater than 0.350 millivolts and less than 900 millivolts.
- At wide open throttle, TPS output voltage must be less than 4.5 volts.
- The output voltage should increase gradually as the throttle plate is slowly opened from idle to WOT.

NOTE: For additional testing information and circuit diagnosis see Computers and Control Systems/System Diagnosis/Procedures/Diagnostic Charts.