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Testing Speed & Reference Sensors??

Old 07-30-2007, 07:26 PM
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Join Date: Apr 2007
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Default Testing Speed & Reference Sensors??

I am wondering if there is a way of testing the speed and reference sensors on my 951? The car won't start. I have replaced the DME relay. I changed both computers and still nothing. I thought that the tach was bouncing but if it is, it is very very slightly and only when you initially hit the key. I got the front sensor out and wondered how to check it...anyone?
Old 07-30-2007, 08:31 PM
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Default RE: Testing Speed & Reference Sensors??

You really need to check the sensors with an oscilliscope, but clarks-garage has a procedure with a multimeter.

www.clarks-garage.com go to his garage shop manual, and under 's' pick speed and reference sensor testing.

If that doesn't get you anywhere, I can post the pages out of the shop manual.
Old 07-30-2007, 09:26 PM
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Default RE: Testing Speed & Reference Sensors??

Just checked them both...seem to be getting a high reading on the reference sensor. I think i will order both in to be safe. Thanks for the help Doc!
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