testing a throttle position sensor on a 1987 chevrolet s10. these readings are not going to be exactly the same as your parts, but watch for spikes in resistance. common symptoms associated with this are: hunting idle, stumbling upon acceleration, and possibly a hard start or no start (engine cranks over though)
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Most of the other videos that I have seen show them testing the TPS tests the DC voltage of the signal wire when the ignition is to the ON position but not started. On the other hand you are testing for Ohms resistance. Does the key also have to be in the ON postion? Also, what is the advantage of testing for Ohms instead of voltage? Thanks.
Because the TPS is essentially a potentiometer, and works on the principal of resistance using a ohm meter to test is just as accurate. The advantage is that you can test the TPS on, or off the vehicle, but you should always make sure the harness has proper voltage with a voltmeter.
Car ECM does not read resistance directly but voltage while driving. Reading from 0 to 5V mostly, and ECM converts/scales it from 0 to 100% of the position opening. The higher the resistance of the TPS/potentiometer, the less current across it.
Some inexperience mechanic adjusted my Suzuki Alto 800, he tilted it up because according to him, idle is a bit rough. Without using a volt meter or any gauge at all. Now it runs rougher, both idling, and surging sometimes. Can I just tilt it down again? Or do i risk damage of some kind?