Testing TPS Throttle position sensor - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

Trouble shooting + Test Procedures Need to trouble shoot whats wrong and need to know the best way to test for it? Here it is.

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Old 02-09-2009, 12:18 PM   #1
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Default Testing TPS Throttle position sensor

Locate your TPS, it'* on the throttle body in front. This is the sensor that'* connected to the butterfly inside the throttle body.

You will need to unplug the sensor.

Then using a ohm meter locate your sense wire, (Dark blue (center)) and your ground wire, (black(bottom)) and connect the meters probes to these. Alligator clips will make this much easier.

If you do not have a auto scaling meter you will need to set to the correct scale. 20k

Now move the linkages and watch the readings. Move it slowly. You want to see a smooth change in the reading. Open all the way, then slowly close it again watching the readings. If at any point you see the readings drop or not move slowly, the sensor is bad.

This video shows how to do the test.

Last edited by Danthurs; 02-09-2009 at 12:29 PM.
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