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  1. #1
    Veteran Member Three Rings
    Join Date
    Sep 11 2007
    AZ Member #
    21010
    Location
    Dirty Jersey

    B5 Audi a4 ABS issue please help (VAG COM?)

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    okay, so I've got a copy of vag com, but I haven't had a bunch or expereince with high level diagnostics like this
    I know the ABS modules in these cars go, but I'm pretty sure mine hasn't

    after a brake job consisting of new pads, and new rotors and tone rings in the back my ABS applys whenever I come to a stop

    I ran an autoscan and the ABS computer is happy

    if I had to guess I either have a sticky caliper, or the ABS tone rings for the rear wheels are the wrong part with the wrong number of holes

    is it possible that I can use vag scope to plot the values of the individual wheel speed sensors so that I can compare relaitve speed differences when comming to a stop to see why the ABS is applyng?

    if so what are the 4 wheels adresses?

    thanks a bunch, this is driving me nuts
    Nine [O_O] Eight Tuning
    custom work, fabrication, bumper shaving, fender rolling, plastic & fiberglass fabrication and repair

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  2. #2
    Established Member Two Rings koncluded's Avatar
    Join Date
    Aug 13 2007
    AZ Member #
    20297
    My Garage
    Audi A4 B5
    Location
    Plano, Texas

    Re: B5 Audi a4 ABS issue please help (VAG COM?)

    grabbed this from the ModuleMaster ABS wizard thing

    1) Jack up the front of the vehicle until both front wheels are off the ground.

    2) Find the sensor connector inside the front-right wheel well, and disconnect it.

    3) Set your multimeter on AC volts, and connect the probes to the connector leading to the sensor.

    4) Spin the tire by hand while observing the multimeter. You should get 180-250 milivolts AC. If not, check the resistance of the sensor. It should be 600-2400 ohms. If the reistance is infinite (open circuit), or very low reistance (a short), the sensor is probably bad.

    5) If you are reading a fluctuating voltage from the sensor, but it is not within the range indicated, the sensor needs cleaning. Remove the tire and locate the sensor mounted within the wheel hub. Remove the sensor and thoroughly clean any corrosion from the aluminum mating surface as well as the sensor's mating surface. Reinstall sensor and tire, then measure voltage again.

    6) Repeat the same process for the front-left sensor. Keep in mind that a discrepancy in voltage between the two front sensors may also indicate a dirty sensor- even if the voltage is within the specified range. The "dirty" sensor will be the one outputting a lower voltage.

    7) Drive the vehicle and perform a brake test. If the problem persists, repeat the process for the two rear sensors.


    ...the wheel sensors might just be dirty too, so clean it up and replug
    good luckk

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