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  #1  
Old 10-11-2012, 08:42 PM
piv15's Avatar
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1992 Volvo 240
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Evan Piveral
Default Speedometer not working...

In my 1992 Volvo 240 wagon, we removed the rear ABS sensor on the final drive, which seems to share with the speedometer and odometer, to clean it. After that the speedometer doesn't work. After hitting a bump it seems it will fluctuate up to about 20 then drop. Just hoping that the sensor isn't in quite all the way or out of alignment perhaps. But what do you think I could do to try and fix it?
Any suggestions are greatly appreciated.
Thanks
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Old 10-11-2012, 09:46 PM
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you probably broke the wire, maybe inside the insulation near the sensor... surprised you're not getting ABS faults too.
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Old 10-11-2012, 09:59 PM
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Haha i was having ABS faults... that was the reason for removing the sensor... How should i go about seeing if wire is broken?
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Old 10-11-2012, 11:36 PM
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unplug it at the back of the speedometer, and use an ohmeter on the signal and ground wire, which are pins 1 and 2 of the 4 pin connector 'D' on the back of the instrument panel. spec says 1820 ohms +/- 180 ohm (so anything from 1640 to 2000 ohms is OK). the wires are brown-white and green-white, where the brown-white wire is normally grounded inside the instrument panel. from the instrument panel, the twisted pair of bn-w and gn-w goes through the large A pillar connector, down the drivers door sill, and through a 2 pin connector in the trunk area and on to the speedo/abs pickup. on the sensor end, the brown-white wire turns brown.
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Old 10-13-2012, 04:37 PM
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Figured it out... after reviewing the Bentley manual i noticed it said something about how tight the screw holding the sensor into place must be. After tightening it, worked like a champ.
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  #6  
Old 06-03-2013, 04:58 PM
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It's been sometime, and lately if I hit bumps, my speedometer wobbles erratically. Today I tried tightening that same screw, and tightening it some more. Still wobbles when I hit bumps. Any suggestions?
Thanks!
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Old 06-03-2013, 05:03 PM
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might be an electrical connection at the speedo end?
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Old 06-03-2013, 05:05 PM
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Perhaps. The thing that connects it, if memory serves me correctly, is that ribbon type cable with the protective clip over it?
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Old 06-03-2013, 05:19 PM
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hmm. I think thats it, but I've not taken a 240 instrument panel apart, only my 1992 740's.

the late 240 wiring diagrams show 2 connectors in the middle, but not where they are located. it shows it goes a 3 wire right angle edge connector that goes into the back of the speedo cluster. the blue wire is switched power from the ignition key, the green-white wire and the black wire go to the sensor in the differential, with the black wire being grounded (probably at the front-left side of the gear shifter). it shows the wire is routed along the driver side door sills from behind the back seat, to near the fuse panel.
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Old 06-05-2013, 08:59 PM
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I checked the wire at the speedometer today. It was a little loose. I also noticed that the protective clip wasn't on it. (Add another thing to the list of things that a mechanic in Lincoln NE didn't do correctly when the blower motor and A/C was fixed.) It still wobbles a little on bumps. But no where near as bad it seems.
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Old 06-05-2013, 08:59 PM
 
 
 
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1992, 240, 740, abs, c30, connection, light, odometer, sensor, speedometer, stopped, volvo, wagon, work, working


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