Faulty ABS

[paul fernandes]

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
*************************************


--- Mike_Buckham at ptk.pioneer.co.uk wrote:
> Hi all,
>
> On my '89 200qta (UK car), my ABS light is permanently on
> and I can't find
> any obvious reason for it. When I first switch on the
> ignition the
> changeover relay in the actuator unit in the engine bay
> clicks on and off
> rapidly twice, so there is some sort of control unit
> activity there. I have
> checked the obvious things like the fuse and connections
> to the control
> unit as per the Bentley manual (wheel sensor resistences,
> alternator
> signal, ground and power supplies and a few others) but
> nothing reveals
> itself to me. The first stage control relay (under the
> dash with the fuse
> in it) is definitely on, but the control unit doesn't
> switch that
> changeover relay on when the engine starts.
>
> I have checked through the archives and found no help
> there. The Bentley
> manual is no help when diagnosing the control unit
> itself, neither is the
> SJM Auto-Technik site. Does anyone know how to diagnose
> the control unit
> and perhaps get some fault codes from it? It is a Bosch
> control unit, but I
> cannot identify which model it is. My car is too old to
> have a service port
> to connect VAG-COM or similar to it. Failing that, can
> anyone suggest some
> common faults that I can look for?
>
> Thanks for any help.
> Mike.
>
> P.S. The previous owner had actually wired the ABS light
> to the alternator
> charge warning light, so it looked like it was working
> properly. Sneaky,
> eh?
>
>
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