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ABS and Track Off Light C70

posted by  someone claiming to be clueless on  Tue Aug 20 13:32 CST 2002 [RELATED]

My ABS and "Track Off" lights are coming on. I just had the pads and rotors changed. What could these lights be indicating? Someone said it might be that my brake fluid is low--but they would have been refilled when having my brake work done.








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    ABS and Track Off Light C70

    posted by  arby on  Wed Aug 21 22:28 CST 2002
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    last visit: Fri Aug 24 01:52 CST 2001
    [RELATED]

    If it is your ABS Controller, Call Nils Sefeldt Volvo in Houston, Texas to order it. I finally ordered one for my 1998 S70 and the cost was only $348.00. I'm going to replace it myself. The local Volvo dealer wanted $500 for the part and $200 to replace it. OUCH!
    --
    1990 744Ti and 1998 S70








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    Known problem C70

    posted by  davidm on  Tue Aug 20 14:18 CST 2002
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    The most likely cause is the ABS/TRACS controller has failed. This is a common problem. Whereas you've just had the brakes worked on, however, you have to determine first whether the ABS system has been disturbed - sensors, wiring, etc. - in the course of the brake work. (TRACS uses the ABS system to retard front wheel spin in loss-of-traction conditions.)

    What usually fails is the solder in the pc board under the ABS block in the engine compartment; a shop repair runs $350 and up. In a recent post to the brickboard, a correspondent indicated he was able to make the repair himself. (How hard can it be? Use a de-soldering tool to remove old solder, then flow the new stuff in.)

    More technical information about this problem can be found at http://www.volvospeed.com/bay13.htm under Brakes and Wheels.

    A recent thread here you may find useful is http://www.brickboard.com/AWD/index.htm?id=509090. This is a middle post, click up and down the thread to follow the traffic.
    --
    (98 S70 T5SE misc mods - mostly lighting - and red calipers) (92 940GLE)








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      Known problem C70

      posted by  someone claiming to be jfedems on  Fri Aug 23 05:15 CST 2002 [RELATED]

      i just had the same problem. they said it was the abs control unit and replaced it.....j.








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      questioning this idea here...... C70

      posted by  someone claiming to be Frank on  Wed Aug 21 00:26 CST 2002 [RELATED]

      It's most likely a bad ABS control unit ($416 plus labor) BUT as for this advice:

      "What usually fails is the solder in the pc board under the ABS block in the engine compartment; a shop repair runs $350 and up. In a recent post to the brickboard, a correspondent indicated he was able to make the repair himself. (How hard can it be? Use a de-soldering tool to remove old solder, then flow the new stuff in.)"


      ...........I don't know if I can believe that as I've read that before here and have personally opened a couple of these control units up (being replaced) to check. First of all, it's not made to be opened up so one must use a hacksaw (or other means) and cut it opened. Then.....the board is coated with a water proof rubber like gel that DOES NOT come off with ease. Next.....IF anyone else has actually seen one of these, we're talking a VERY small circuit board with VERY SMALL solder lines and no solder iron that I own (and I own several btw) or have seen is small enough to even think about trying that. I don't know where one would purchase a soldering iron with a tip small enough BUT that brings me to my next point........WHERE exactly does one solder? It's not adviseable to just start laying down beads of solder on any circuit board w/o knowing what you're doing or why you're doing it. I have never seen what looks like "bad solder joints" when inspecting one of these and the original solder looks perfect (no cracks or burns).

      When re-assembled, you'ld have to use an epoxy to re-assemble and it must be water proof again or it'll fail (if actually fixed).

      Can anyone here verify that they've personally done this repair and add a few more specify details to my questions above? If not, it's my opinion that trying that is bad advice as I think it'll be a waste of time. The correct solution is to replace the control unit.








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        questioning this idea here...... C70

        posted by  davidm on  Wed Aug 21 07:43 CST 2002
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        I personally had mine replaced. But Gazzer's post hinted that they actually repaired the board (solder reflow and a hardwire jumper or two) and put it back in. I've fixed many PC boards with broken solder and would have attempted this, too, had my car not already been in the shop for other routine maintenance. It was just easier to write the check.

        PC boards are normally pre-fluxed (for lack of a better term) so the solder flows to the right places, and doesn't stick to the wrong ones. Obviously, you'd need to have the electronics-grade solder composition. (PC boards are usually soldered by immersing the entire board in a solder bath.) Again, I haven't done this particular repair, but Gazzer - a Volvo tech who can shine a little light on this - apparently has.

        Looks like my ABS unit comes apart without a hacksaw.

        I'm pretty good at repairs - including tough ones. I've done many things they said I couldn't do (e.g., rebuilt a turbo for $96 in parts). If my ABS/TRACS board goes again, I'll fix it myself regardless of gels, epoxies or other supposed obstacles.
        --
        (98 S70 T5SE misc mods - mostly lighting - and red calipers) (92 940GLE)








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          questioning this idea here...... C70

          posted by  someone claiming to be Frank on  Wed Aug 21 16:49 CST 2002 [RELATED]

          Well, I'm not only an electronic type guy who's always played with electical devices for fun since being a kid but I'm also a Volvo dealer master tech and no dealer tech would do this attempt at work for various reasons other than what I've previously mentioned.
          Volvo now wants the old units back to apparently be rebuilt(?) when they didn't use to before and that's why I've dissassembled a few of them to check this idea. I'm sure that IF the problem really is bad solder joints (which to me is purely a guess here), someone could fix it if they're experienced enough and had the proper equipment BUT my point here is that this idea is definately not one that I'd say just anyone could do with basic store bought soldering equipment at home.

          If I owned a '98 X70 that needed one of these, I'd just prefer to buy a new unit myself after seeing what's inside.

          Another idea about this is if one trys and fails and ends up buying a new unit from a dealer, they will probably not get the core charge returned when the parts guy sees that the originals been apart. Just food for thought.








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            appreciate the input C70

            posted by  davidm on  Fri Aug 23 08:07 CST 2002
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            I've actually wondered why there's been no recall...and perhaps less costly remanufactured parts are soon to be available. In the meantime, if I ever do feel the need to open it up for a repair I now know what I'll be looking at.

            You're quite right that it would take a pre-requisite amount of skill to attempt this kind of repair, but with care, persistence, and the right kinds of tools and materials it can be done. Since I have some of the electronics-grade solder reflow supplies already, which I acquired for the purpose of repairing pc boards (from TVs and PCs), I think I'm fairly well equipped and wouldn't hesitate to make this repair myself if it happens a second time. (I hope, however, the Volvo repair made at 75K miles was permanent.) I really wish Volvo had simply issued a recall on this item.

            I can see that your customers have placed their car in good hands.
            --
            (98 S70 T5SE misc mods - mostly lighting - and red calipers) (92 940GLE)







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