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Krazee Speedometer ........... 700 1991

posted by  Lummer57 on  Thu Sep 30 08:26 CST 2010
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last visit: Thu Oct 28 03:22 CST 2010
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1992 Volvo 740 auto sedan. Help ! My speedometer has gone krazee. Needle bounces up & down erratically. Hope it isn't speedo itself. Maybe it is bad wire. Does wiring to speedo come from tranny or from rear differential. I see wires coming out of both tranny and rear differential. Wire from tranny goes to a connection by firewall in engine compartment. Lord knows where differential wiring goes to. Thanks for help with this herky jerky speedo.
--
' 91 740 sedan nearly 157,000 and ' 87 240DL auto nearly 135,000








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    Krazee Speedometer ........... 700 1991

    posted by  rstarkie on  Thu Sep 30 12:03 CST 2010
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    last visit: Fri Oct 24 10:14 CST 2014
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    Best guess is that the speedometer is at fault. The 740/940 speedometers from 1991/92 seem to get the most posts from owners. There is some reading in the FAQ's on this subject- available at the drop down menu at the top of the page.

    Good luck,
    Randy








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    Krazee Speedometer ........... 700 1991

    uid 5559's pic
    posted by  Guid on  Thu Sep 30 08:51 CST 2010
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    last visit: Thu May 9 12:04 CST 2013
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    The wire for the speedometer comes from the rear differential. Look at the wiring in that area for worn or bare places. You might be able to repair it.

    If you find you need to replace the entire length of wire, you can find a donor car and take the wire and connector from the level sensor on the top of the brake fluid reservoir. The connector is an exact match.

    Best of luck!
    --
    Guid ('92 745 257k, '91 940 SE 278k,)








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      Krazee Speedometer ........... 700 1991

      posted by  Lummer57 on  Thu Sep 30 11:32 CST 2010
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      last visit: Thu Oct 28 03:22 CST 2010
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      Thanks for your reply.I see that there are 2 wires coming out of differential connection/plug. Where do these go to/connect to at front end of car ? To a wiring harness ? Exactly where ? Also how do I know that wiring is problem and not the speedo itself ?? It is an intermittant problem that just started Today. It works I would say most of the time but every now and then goes wacky for a few seconds to a few minutes. Thanks again.
      --
      ' 91 740 sedan nearly 157,000 and ' 87 240DL auto nearly 135,000








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        Krazee Speedometer ........... 700 1991

        uid 5559's pic
        posted by  Guid on  Fri Oct 1 02:18 CST 2010
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        last visit: Thu May 9 12:04 CST 2013
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        The sensor at the differential does double duty. It is both the speedometer sensor and the rear ABS sensor. I'm not sure where the two wires eventually end up. However, when the needle goes erratic, does the odometer continue to operate smoothly? If it does NOT, then the problem is most likely with the wiring between the sensor and the speedometer. If the odometer continues working normally, but the speedo needle is haywire, it's most likely the gauge. You can also test it with the cruise control. If the cruise control is working normally when the gauge is haywire, the problem is most likely the gauge.

        Also, sometimes if the issue is wiring, when the problem gets so bad that no connection is being made, you may also get an ABS light, because the ABS system isn't recognizing the rear sensor.

        My '92 has the exact same issue. The haywire needle seems to last for a while, then it will work normally for weeks or months at a time. Then it shows up again. At this point, I believe the issue is with the gauge, and it's more an annoyance than anything more.


        --
        Guid ('92 745 257k, '91 940 SE 278k,)








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          Krazee Speedometer ........... 700 1991

          posted by  Lummer57 on  Fri Oct 1 04:52 CST 2010
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          last visit: Thu Oct 28 03:22 CST 2010
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          Thanks again Guid. This car does not have cruise control so can't test that. Odometer works fine even with speedo going haywire. So I guess my speedo itself is bad. Looked on e bay - not a cheap part - nearly $150. Actually rear speed sensor on differential is about same. So either way regardless of which end is bad it's a $150 repair. As problem comes and goes what I think I will do is wait until I can find a cheap complete cluster with speedo. That way besides speedo I'll have other spare cluster stuff. Thanks yet again.
          --
          ' 91 740 sedan nearly 157,000 and ' 87 240DL auto nearly 135,000








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            Krazee Speedometer ........... 700 1991

            uid 5559's pic
            posted by  Guid on  Fri Oct 1 04:58 CST 2010
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            last visit: Thu May 9 12:04 CST 2013
            [RELATED]

            Best of luck with the repair. If you haven't already, check out the FAQ section RStarkie referred to. Lots of good info there. Including one person who replaced the $150 gauge and found out it wasn't the problem. Gotta save those $$$ where we can!
            --
            Guid ('92 745 257k, '91 940 SE 278k,)







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