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Checking a 99 VSS output???


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That is because it is not a voltage, but a signal. sort of like :

 

_|-|_|-|_|-|_

 

Well, something like that. the more ticks per second, the more speed, and the higher the needle goes. At least that is what goesw into the ECU. I'm sure that the guage uses something similar.

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I pulled the VSS to drive it by hand and check the speedo and the VSS broke in two. After installing a new one and tightening the screws that hold the speedo to the dash all is Fine.

 

For owners with this problem, it may be worth a try to remove the dash and then one at a time remove clean and reinstall the 5 speedo screws.

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