Volvo AWD 850 Forum

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ABS 850

Any one out there knowledgeable in pre 96 ABS systems? I am still working on trouble shooting my 93 ABS system. I am having the self check engage almost every time the car passes through 15-20 MPH wheter I am accelerating or braking. I have tried a diferant ABS CU, and a Differant ABS relay. No ABS light on dash, and no ABS codes stored. Rebuilt calipers, cleaned ABD pickups at wheels front and rear.

Looking for wiring diagram to find out where the Self check is activated from and what tells it to function only once after the car is running??








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    ABS 850

    It's supposed to self check.
    --
    whilst








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      ABS 850

      The self check is suppose to function only once when the vehicle is started as it goes through 15-20 MPH. Duration should be only a second or two at most. I am having the self check cyle almost every time the vehicle passes through 15-20 MPH whether I am acelerating or braking. The check cycle is getting "stuck on" lasting for up to 10 seconds and activating the brakes making for some very quick stops and hard acelerations. Not a problem if you are driving on a highway all the time, but very annoying around town.







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