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ABS problem

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  • #442963
    BroddrBroddr
    Participant

      When I start my truck as long as i don’t press on my breaks my abs light comes on and i have no problem stopping but if i step on the break when i start the truck the abs light goes out and the abs kicks in when i try to stop, any help

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    • #442964
      college mancollege man
      Moderator

        A little more info. year, make,model and engine size. how many miles any cel? if so post the codes C8-)

        #442965
        johnzcarzjohnzcarz
        Participant

          Quoted From college man:

          A little more info. year, make,model and engine size. how many miles any cel? if so post the codes C8-)

          +1 A little more info would be good.

          Sounds like it’s failing some diagnostic self-test on startup. Can you get the code read?

          Generally, when the ABS kicks on just as you are about to stop, means one of the wheel sensors / toner rings has a problem. The slower the vehicle travels, the weaker the AC signal generated, so if the sensor/toner ring have a problem (could even just be road buildup on the surface of the sensor)the signal is even weaker than normal to the point that the ABS computer thinks the wheel is locked up and engages the ABS.

          #442966
          dreamer2355dreamer2355
          Participant

            Welcome to the forums.

            I would also suggest having the ABS code read as it will give you a starting point.

            #442967
            BroddrBroddr
            Participant

              Quoted From johnzcarz:

              +1 A little more info would be good.

              Sounds like it’s failing some diagnostic self-test on startup. Can you get the code read?

              Generally, when the ABS kicks on just as you are about to stop, means one of the wheel sensors / toner rings has a problem. The slower the vehicle travels, the weaker the AC signal generated, so if the sensor/toner ring have a problem (could even just be road buildup on the surface of the sensor)the signal is even weaker than normal to the point that the ABS computer thinks the wheel is locked up and engages the ABS.

              its a 99 fort f159 222000 miles it ha a 4.6 engine, how would i look or find which sensor is screwing up

              #442968
              BroddrBroddr
              Participant

                I meant to say which sensor is screwing up

                #442969
                Trcustoms719Trcustoms719
                Participant

                  Quoted From Broddr:

                  I meant to say which sensor is screwing up

                  Pull the ABS code(s)

                  #442971
                  EricTheCarGuy 1EricTheCarGuy
                  Keymaster

                    +1 on getting the code read that will be your best clue as to what is happening in the system. You may be able to get the code pulled for free at your local auto parts store.

                    #442970
                    johnzcarzjohnzcarz
                    Participant

                      Quoted From Broddr:

                      its a 99 fort f159 222000 miles it ha a 4.6 engine, how would i look or find which sensor is screwing up

                      Getting the code read would be the fastest way, especially since it may not be a sensor problem at all. But to answer your question, the other methods are to disconnect each sensor and do both a resistance measurement and (a bit more complicated) use a scope to look at the AC waveform as you rotate the wheel and compare voltage to the spec in the manual. A voltmeter won’t sample fast enough to give you meaningful results.

                      Measure resistance between both conductors, and then each conductor to ground. Voltage would be between both conductors.

                      Sometimes you get lucky and find 1 of the 4 has a different resistance, conductivity to ground, or open circuit /no voltage generated as the wheel rotates so you may not even need the spec. to know it’s bad.

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