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Thread: ABS Issues

  1. #1
    Join Date
    Feb 2003
    Location
    Northwest Pennsylvania
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    706

    Default ABS Issues

    I've searched the forums for ABS but don't get many hits, so I'll put this out there in case someone has some insight -

    2 years ago I failed the left rear wheel bearing, and it quickly took out the ABS sensor. Both the replacement bearing and sensor were OEM parts.

    Last month i was driving in a snow storm and the ABS light came on, which also takes out traction control. Last week I was having the tires rotated at a local chain and asked them to take a look at the ABS issue - they said the left rear sensor was reading intermittently, but they could not easily get the part. I thought it was strange that the 1 new sensor failed again, but I ordered another from FCP and they installed it today, but the problem remains.

    I wonder if what looked like a bad sensor was really a bad connection elsewhere in the circuit?

    Any thoughts appreciated. I'm already down to front wheel drive, and without the traction control, I'm effectively down to 1 wheel drive.
    '04 XC70 (petrol/auto), Nautic Blue / Graphite, Premium, Touring, Boosters, Xenia Wheels w/235x60 Nokian WR's (wife's kid-hauler)
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  2. #2
    Join Date
    Dec 2010
    Location
    Cumbria, UK. Maine USA.
    Posts
    512

    Default

    Have you checked the reluctor ring (tone ring) for cracks and excessive corrosion, I had to replace both front rings on my 04 for cracks due to corrosion building up under them, The sensor is only as good as the ring it reads from.

  3. #3
    Join Date
    Feb 2003
    Location
    Northwest Pennsylvania
    Posts
    706

    Default

    good thought - I had that issue a few years ago and replaced both axles as the rings were not available at that time - they checked and said they were oK - the rear uses a different system where the sensor reads something internal to the bearing - no exposed toothed wheel
    '04 XC70 (petrol/auto), Nautic Blue / Graphite, Premium, Touring, Boosters, Xenia Wheels w/235x60 Nokian WR's (wife's kid-hauler)
    '09 C70 retractable hard top convertible. Red with black interior.

  4. #4
    Join Date
    Feb 2003
    Location
    Northwest Pennsylvania
    Posts
    706

    Default

    Well - Delores went to my neighborhood garage today - they found the same 'staticy' trace on the leff rear ABS sensor (which was just replaced last week) - but they found the surface of the wheel bearing / hub that the sensor 'reads' was somehow corroded (their word - even though I think it's non-metallic). In any case, an hour of labor later they had cleaned up both sides and the problem seems to be solved.
    '04 XC70 (petrol/auto), Nautic Blue / Graphite, Premium, Touring, Boosters, Xenia Wheels w/235x60 Nokian WR's (wife's kid-hauler)
    '09 C70 retractable hard top convertible. Red with black interior.

  5. #5
    Join Date
    Feb 2003
    Location
    Northwest Pennsylvania
    Posts
    706

    Default

    Here is the 'before' trace - after they cleaned up the hub all 4 were the same.
    Attached Thumbnails Attached Thumbnails abs_trace.JPG  
    '04 XC70 (petrol/auto), Nautic Blue / Graphite, Premium, Touring, Boosters, Xenia Wheels w/235x60 Nokian WR's (wife's kid-hauler)
    '09 C70 retractable hard top convertible. Red with black interior.

  6. #6
    Join Date
    Feb 2010
    Location
    Virginia Beach
    Posts
    4,054

    Default

    The sensor works on induction. The reluctor ring MUST be metallic...or there will be no magnetic field...no induction.

    It's probably pure iron. That's why it corroded.
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  7. #7
    Join Date
    Feb 2003
    Location
    Northwest Pennsylvania
    Posts
    706

    Default

    Agree - iron or steel - but when I've seen those rear bearings (and I've bought 2 from FCP in the past 18 months) whatever was in there for the sensor to pick up on was hidden from view behind some sort of flat circular non-metallic cover - it's not out in the open like in the front. Maybe the cover comes off or something - I don't know. in 3 months when it warms up I'll get under there to take a look - and (in a perfect world) - maybe clean those up from time to time.
    '04 XC70 (petrol/auto), Nautic Blue / Graphite, Premium, Touring, Boosters, Xenia Wheels w/235x60 Nokian WR's (wife's kid-hauler)
    '09 C70 retractable hard top convertible. Red with black interior.

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