How to perform a TPS sweep test using a digital multimeter and a scope.
This primary purpose of this video is to show you how to test a throttle position sensor with a voltmeter. At the end of the video I will also show you what the signal should look like on a scope. There are limitations to what the voltmeter can do, which will also be discussed.

Engine Performance Diagnostics chapter 7 pages 10-13

test shown enh 50

  • TPS sweep test using a voltmeter
  • limitations of a voltmeter

Tools used

  • digital multimeter
  • labscope

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(Chapter 7) Potentiometer-position sensor tests TPS, EVP, APP, VAF etc

Related videos:

Hesitation and idle problems from a bad TPS (OBD1 Eclipse):


How to test a throttle position sensor (P0121, P0122) GM wiring integrity:


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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.

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