I have a 97 GMC Jimmy SLE 4wd, It wouldnt shift the other day and threw me a p0500 code, Bad VSS. I took out the old one and put an ohm meter to it. I got 1.3k ohms. I bought a new VSS which read 1.2k ohms. After installing the new one it seems fine. Part of me wants to put the old one back in to see what happens, but I don't feel like it. Did I test them correctly? Or did I maybe wiggle a loose connection and buy a new VSS for nothing?

 

Welcome from new York. Post up or search the correct section and you may find or get your answers.

 

Actually, your pcm already did it. There's more to a VSS than what you can tell from ohmming it out. Though that will find one that failed completely. The PCM will apply some of the same logic to the VSS that it uses in missfire detection.

The only REAL troubleshooting you can do is check the harness connector. Or maybe pull it and check for metal filings on the end.

Added: for your educational enjoyment, let's let Stephen Hawking, Nobel Prize winning astrophysicist relate the present and future of VSS as he sees it:
http://www.youtube.com/watch?v=nBqZ6lQ3IVQ

Well. what he didnt tell you is that in the near future, there will be no need to calibrate VSS for different tire sizes and heights.

It will be done automatically by integrating collision avoidance radar processing. The VCM will compare the ABS output to returns from stationary objects and modify the velocity baseline accordingly.

Just sayin...