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ABS false pump actuation


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#1 Grannie

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Posted 17 April 2018 - 08:18 AM

          Hello,

 

        Here is the history ...

 

 

   Purchased car     (no lite on)

 

  light came on,,,,,, say about a year later.....

               (there were no noticeable symptoms)

then

 

   On one of my   annual inspections...

(where I have to get the check engine light out)

 

       I was using AN OBDII  scanner.....

  THE SCANNER SAID   " POSSIBLE OPEN CIRCUIT ON  REAR PASSENGER SIDE WHeel SENSOR"

 

                               (STILL::::::::: there where no noticeable symptoms)

 

 

ReCENTLY::::::::::::::::::

 

                           Now there is a symptom.......

    AS the vechicle comes to a stop (pretty much under speeds of 20mph)

        there is a constant shutter in the brake pedal....(false ABS pump actuation)

 

              Possible causes::::

 

                       Maybe it is the wheel sensor that came up on the scan..... but it is possible that it is not.........

                  I don't know for sure.As I have not investigated this.. but, my point being... these sensors are expensive..... I don't want to

                  get into dumping money into sensors  and racking up a big bill......

 

                     ALSO,,,,   at the current time I am not able to repair vehicle due to the vehicle's location.....

                  It is not near me that I can just go and work on the car....

 

                  Is there a way to DISABLE the ABS system completely  (SO it doesn't do this false actuation as low speeds)??????????????

                   I understand that if disable is possible then no ABS system on any of the wheels

 

                           Thanks, Grannie



#2 Grannie

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Posted 20 April 2018 - 06:48 AM

Hello?

 

 

   Is there anybody here?



#3 Grannie

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Posted 28 June 2018 - 09:48 PM

Asking the forum if anyone has any thoughts on this thread

 

would appreciate  if someone could chime in...

 

thanks, Grannie



#4 BuckeyeSVT

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Posted 01 July 2018 - 11:47 AM

Normally the tone ring (part of the hub assy) rots out and causes false ABS activation. Pull the wheel and brake rotor (if disc brakes) and look at the back of the hub. On the backing plate you should see the ABS sensor sticking through. There should be a toothed wheel that it's reading. If you spin the hub slowly look for a crack in the ring (looks like a deep gap) that the issue. A new bearing/hub assy will fix that and it's not too hard to replace.

 

-Dominic



#5 Grannie

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Posted 11 July 2018 - 08:52 AM

Hey Thanks!

 

I will take a look at this today, finally.

 

One other question...   Is there any way to see/suspect which wheel to the the vehicle is tripping this off? 

 

I guess the problem is that this is a mechanical defect.... I will not be picked up by the OBDII scanner(Correct?)

 

THanks, Grannie



#6 Grannie

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Posted 11 July 2018 - 10:17 AM

AND

 

 

    What about just   disabling the    ABS  system completely?(NO more ABS)

 

This system is archaic...   piece of junk.... stoneage.....



#7 Grannie

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Posted 11 July 2018 - 11:34 AM

Yup!

 

      Tone rings..... both front  axles ,   they do have one spot in them that is  bad.........

 

 

I am looking at disabling the system.



#8 Grannie

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Posted 11 July 2018 - 12:42 PM

So  in conclusion here......

 

The front sensors have been disconnected......

 

Yielding  no more false actuation   of the ABS pump......

 

This is much better the what previously existed.....

 

Yes,   No more ABS....



#9 BuckeyeSVT

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Posted Yesterday, 07:34 PM

Well, that's one way to fix it... Glad you found the issue.