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91 740 t Speedometer sensor 700 1991

posted by  sulloway on  Tue Jul 6 08:32 CST 2010
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last visit: Fri May 6 06:12 CST 2011
[RELATED]

Well here is how far I got with troubleshooting the no speedometer issue. After I posted yesterday I ran the car for a while and the speedometer worked. Just to be on the safe side I wiggled under the car and shook the wires at the generator (sender ) end. Yep, you guessed it! Speedometer quit and stayed dead.

So I put the car up on the ramps and pulled the sender loose after unplugging the leads from the sender.Couldn't get the sender loose completely because of the panhard rod across the differential Tried to clean the plug contacts with brake cleaner. Put it all back together. Still doesn't work@!!!!!!!!

So A couple of questions
1. What would I be looking for going up or back to the Speedometer Volts, Mvolts or something else on either the brown wire or the green and white wire. I am assuming that the Sender is a basic Hall effect device and we probably don't have a way to read it.

2.Does the sender harness plug wire plug into anything else before going into the dash?

3. Somebody (Paul) mentioned getting a new pigtail, is it available from Volvo or are we talking salvage yard?

I'd feel better being able to trace the circuits and having a couple of known clean connectors the next time I get under the car.

All this trauma so I can sell the Car!

1991 Volvo 740T 222000 miles, runs good. Just had new timing belt 50 miles or so!

Let's hear from you folks,

Thanks for all who have replied!

Woody





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