Faulty ABS

[Bernard Littau]

You are correct in that the ABS light being illuminated from ignition on
means that it is not a dirty wheel sensor or a wheel sensor out of
adjustment.  If it were either of these, the ABS light would come on several
seconds after the car starts to move.

It could still be an open or a short to one of the wheel sensors, as far as
I recollect from the ABS system when I did battle with it several years ago.

The Main ABS control electronics under the rear seat are fairly robust and
not likely to have failed.  The ABS relay, under the dash on the left side
of the USA Steering wheel, seems most likely as the culprit to an ABS light
on all the time problem.  I wound up replacing mine, after testing with a
known good one from another car.  The ABS relay is reddish, with a fuse
stuck in the top.

Best,

Bernard Littau
Woodinville, WA
'88 5ktq

> Hi Mike,
> HMMM yeap you may be right if the light is on before you
> move..then it sounds like somehting else ...how about
> getting a spare from a scrap yard ...
> I think allaudi at ..www.allaudi.co.uk/
> has a few of these hanging around....I have gotten some
> spares from them and I paid a decent price...in the case it
> is the box.
>
> Paul F.
> Custom-auto-craft.com
> Luxembourg
> *************************************
>
>
> --- Mike_Buckham at ptk.pioneer.co.uk wrote:
> >
> > Thanks for the reply, Paul. But I don't believe that this
> > is the problem
> > because the light is on even before the car starts
> > moving. I would have
> > thought that as long as the resistences of the wheel
> > sensors are correct,
> > the control unit would not detect a problem with them
> > unless the car
> > started moving. Perhaps I am wrong? I'm concerned that it
> > may be the
> > control unit itself which is faulty. That sounds
> > expensive!
> >
> > Cheers, Mike.
> >
> > Mike,
> > This may be a some wasted 04 euro cents but did you check
> > the abs sensors if they were dirty?
> >
> > I have had several issues where if they are dirty up
> > front
> > where the actuall sensor is located then it does not pick
> > up the signal from the hub spines and gives the signal to
> > the control unit that one wheel is "maybe" blocked..thus
> > the computer brings the whole unit off-line..due to "a
> > problem"
> >
> > I found this out by mistake once...everytime this happens
> > now to myself or friends we do the same and ..walllaaa.
> > problem fixed.
> >
> > Paul F.
> > Custom-auto-craft.com
> > Luxembourg