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ABS rear end speed signal problem 200 1993

posted by  Jessiejosco on  Thu Nov 19 11:37 CST 2015
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last visit: Thu Oct 23 12:42 CST 2014
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I'm having trouble tracking down an ABS/speedometer problem
The speedometer flickers all over the place and the ABS light keeps coming on
The wires have been checked around the rear end, and it now has a new speed sensor in the differential, but I am still having the same problem.
So I am wondering where the abs unit splices into the speedometer signal? Does is connect in the dash or directly to the speedometer?
Any other possible things I should look at?








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    ABS rear end speed signal problem 200 1993

    posted by  trichard on  Thu Nov 19 11:43 CST 2015
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    last visit: Fri Oct 24 05:52 CST 2014
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    you might have dirty wheel sensors. not dirty enough to cause a full time light but dirty enough to be close.

    as for the abs/speedo connection i doubt you will find fault there in the wiring unless the connector at the speedo board is loose or wires there are poorly secured in the l bracket







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      ABS rear end speed signal problem 200 1993

      posted by  Jessiejosco on  Thu Nov 19 13:21 CST 2015
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      last visit: Thu Oct 23 12:42 CST 2014
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      Thanks for the diagram.
      The front sensors have been checked and the abs light only comes on when the speedometer starts getting erratic so I am pretty sure it is the rear sensor.
      The problem with the wiring diagram is it does not show physically where the abs wire splices into the speed sensor wire. Do you know if it behind the speedometer or on the floor somewhere?








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        ABS rear end speed signal problem 200 1993

        uid 27's pic
        posted by  Art Benstein on  Thu Nov 19 14:23 CST 2015
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        last visit: Fri Oct 17 20:10 CST 2014
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        I'm not sure where the splice is on a 93, either. But I'd be really surprised if you documented that as the root of the trouble. Are you absolutely certain it isn't a fault in the wiring between the differential and the tamper-evident box with the splice just above?

        The wire chosen for that has indeed been the root of much Volvo evil, as a result of its silicone insulation or its 241 strand conductors. Have another look at the back end of the car before you start tearing the dash harness apart.
        --
        Art Benstein near Baltimore

        Lettin' the cat outta the bag is a whole lot easier'n puttin' it back.








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          ABS rear end speed signal problem 200 1993

          posted by  trichard on  Thu Nov 19 14:41 CST 2015
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          last visit: Fri Oct 24 05:52 CST 2014
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          as i recall the wire connection is above the left drivers knee in the nest of wires.

          it is much easier to simply check continuity between the relevant wires at the L bracket with the same color wire at the abs computer front of the passenger seat under the front carpet.

          i think arts right about the location of the problem. the only other thing might be a damaged window pane signal ring inside the differential.

          only non filthy way to check it is jack up the rear end so axle spins by rotating the tires and remove speed sensor. have someone slowly rotate the tire, trans in neutral while using a strong light to inspect the slowly turning speed tone ring.

          or remove pumpkin cover and look closely.








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            ABS rear end speed signal problem 200 1993

            posted by  Jessiejosco on  Thu Nov 19 15:07 CST 2015
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            last visit: Thu Oct 23 12:42 CST 2014
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            Thanks for the advice. Yes it makes sense that the problem is around the rear sensor. I must admit I have not been under it myself yet. It has been to a trusted mechanic twice about it. I live in the snowbelt/rust area so the car is pretty heavily undercoated underneath. That makes it pretty unpleasant to work on without a car hoist.
            The differential cover has been taken off and no issues were found plus it has a brand new volvo sensor that i probably did not need.
            What about this 24 stand wire? Is there something special about it or can I just spice in a new wire?








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              ABS rear end speed signal problem 200 1993

              uid 27's pic
              posted by  Art Benstein on  Thu Nov 19 15:21 CST 2015
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              last visit: Fri Oct 17 20:10 CST 2014
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              241 was not a typo, but it was a mistake. The actual strand count is 413.

              The high strand count wire is used wherever the wire flexes in normal operation of the car; between body and differential, between body and transmission, in the door lock switches, and the tailgate hinges.

              It just needs repair, like any other broken wire. If you replace it with ordinary wire, it might not last 22 years. :)

              http://cleanflametrap.com/speedoDiag.html This shows you where the other end of that wire is (on the clean side of the undercoating)


              --
              Art Benstein near Baltimore

              Did you hear that they were going to rename the Hertz after Charles P. Steinmetz? The abbreviation will be CPS.








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                ABS rear end speed signal problem 200 1993

                posted by  Jessiejosco on  Thu Nov 19 16:59 CST 2015
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                last visit: Thu Oct 23 12:42 CST 2014
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                Ok thanks. I was going to see if I had an old sensor around and use the wire from it to patch the cable. You can't seem to buy "high" strand wire around here that I can find.

                I am pretty sure the speedometer is fine, and even if it wasn't I don't see how it would be causing the ABS error. I already went through an ordeal with the speedometer. I have several used speedometers and the odometer drive did not work on any of them.

                I miss my 1984 240: Kjet fuel injection, mechanical speedometer, and so much less wiring.








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                  ABS rear end speed signal problem 200 1993

                  uid 27's pic
                  posted by  Art Benstein on  Thu Nov 19 18:15 CST 2015
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                  last visit: Fri Oct 17 20:10 CST 2014
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                  What I would do, if a Friday night and one not dedicated to getting myself too dirty for date night: Get my multimeter and some clip leads. Clip them to the connector in the little box to measure the sensor resistance. Use my foot to jostle the gray sheathed cable to the diff and maybe wiggle it from up above where it goes into the plate over the fuel tank sender.

                  If the trouble showed up, then I'd plan some down and dirty work with the wiring to the sensor.





                  If not, then I'd plan some sunny day work to find the pins in the long dual row plug and socket up near the driver's left toes where the harness joins. Might be wrong, but that's how I would plan it.

                  --
                  Art Benstein near Baltimore

                  Progression of engineering education: a good planner needs to know at least a little bit about a great variety of topics, and engineers often succeed by specializing, so we planners like to say that over time, planners learn less and less about more and more until eventually they know nothing about everything. Engineers learn more and more about less and less until they eventually know everything about nothing.








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                ABS rear end speed signal problem 200 1993

                posted by  trichard on  Thu Nov 19 16:02 CST 2015
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                last visit: Fri Oct 24 05:52 CST 2014
                [RELATED]

                there is the possibility not discuss as yet you have flaky speedometer. if you can swap clusters you will know instantly which end of the car your problem lies.








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        ABS rear end speed signal problem 200 1993

        posted by  Onkel Udo II on  Thu Nov 19 13:23 CST 2015
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        last visit: Fri Oct 24 08:50 CST 2014
        [RELATED]

        99% sure the ABS speed signal comes from the speedo head but I might be confusing this with "idle down" signal that is unique to the 92/93 clusters.







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