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1993 Volvo 940 sedan speedometer and odometer stopped working 900

uid 27's pic
posted by  Art Benstein on  Sat Aug 26 17:14 CST 2023
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last visit: Fri Oct 17 20:10 CST 2014
[RELATED]

"There are no circuitry diagrams for the speedometer unit."

Perhaps not helpful immediately, but I have one here for nearly 10 years:



Dave, I had corresponded with OP off list suggesting he might want to verify the wiring back to the sender, but couldn't offer any practical suggestions for the 940 with wire colors to find its termination in the cluster. I think your response is helpful.

In the above drawing from http://cleanflametrap.com/speedo7.html the sender's resistance should be found between terminals 1 and 4 (ground and pulse) as labeled on the meter connector.

Not sure how practical this would be to access, but one would expect the resistance reading to be very close to that of the sender's coil. I also discouraged him from trying to measure the output voltage from the reluctor with an AC voltmeter because the results can be misleading.
--
Art Benstein near Baltimore

"When you sit with a nice girl for two hours, it seems like two minutes. When you sit on a hot stove for two minutes, it seems like two hours. That's relativity." -- Albert Einstein






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