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    Anti-lock problem?

    I went to the store... the anti-lock lit when i started the car.. I don't know why then I turned off the engone and start again and it was still there. So drove to the store got in and got out and went to my car. But when I started the car it wasn't there anymore.. really weird. Could there be a problem with my ABS? Could it be a worn out sensor? I don't know how to resolve this. This actually not the first it happened so I'm a little concerned. I would appreciate any tips or help. Thanks!

    #2
    Anyone..?

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      #3
      Troubleshooting the ABS system isn't very difficult. It is a stand alone
      system that only gets input data from the brake light switch, wheel sensors and
      system power. The parts of the system are the ABS module located next to the
      steering column, the ABS relay mounted above the ABS module, the ABS unit in
      the left front of the engine bay, and a wheel speed sensor at each wheel.

      If the ABS light comes on with ignition, but doesn't go out when the engine
      starts, a wiring problem, bad module, or bad ABS relay are the likely
      candidates. A failed or weak alternator will also cause this because the
      system voltage won't rise enough. There is a fusible link inside the ABS relay
      that can be blown. The relay can be repaired, or better yet replaced.

      If the ABS light comes on when you turn on the ignition, goes out when the
      engine starts, and then comes back on before the car is moving the cause could
      be a bad module, a bad ABS unit, or a wiring fault.

      If the goes out after engine start and only comes one when the car is moving,
      there's a problem with one (or more) of the sensors. The simple test to find
      out which sensor(s) is the cause is to disconnect all but one of the sensors
      and drive the car. If the light comes on, that sensor is sending a speed
      signal to the ABS and is good. Repeat with each other sensor to find the
      one(s) that don't cause the light to come on. Since the ABS module has no
      speed input besides the wheel sensors, if only a bad sensor is connected the
      module can't tell the car is moving and thus doesn't fault on missing speed
      signals from the other wheels. Once a bad speed sensor is found, if a new
      sensor still doesn't work, there could be a wiring fault in that circuit or a
      bad input channel in the ABS unit.
      The car makes it possible, but the driver makes it happen.
      Jim Levie, Huntsville, AL

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