[V8] Intermittent ABS light and diff locking up

[Dave Saad]

As long as the crud in the teeth is not magnetic (not iron) you should  
be fine.  The clearance from the teeth to sensor makes a difference  
though.

As for the hit or miss debug method, the ABS system has a connector  
for the VAG-COM type tool. If the system knows enough to turn on a  
light, it should be able to tell you why.
The connector is behind the driver side console cover - near where the  
ABS module itself is located, and where the backup power reserve  
connector is located.

Dave

On Sep 13, 2009, at 7:11 PM, Mark Kalbskopf wrote:

> Whenever I've looked at the ABS teeth, they just seem to have the
> usual rough, dusty, slightly rusty surface, but never any major crud
> or anything.
> What I really need is a magical read-out of the signals coming from
> all 4 wheels while I'm driving.
> Otherwise it's a bit of a hit & miss operation, where I replace each
> sensor in turn until the problem goes away.
>
> Mark.
>
>
> On Sep 13, 2009, at 4:11 PM, qshipq at aol.com wrote:
>
>> I've cleaned many ABS teeth, and this could definitely be the
>> problem.  On the fronts, you can pull the driveshaft out of the hub
>> enough to clean it without major dis-assembly.  I really doubt trans
>> codes will help you in any way here.  I put up a pretty nerdy post a
>> several months ago on how the center locking works on the v8, and
>> Tony described it again well.  It appears you have a diff lockup
>> signal sent from the trans ecu, caused by one of your abs sensors
>> out of whack with the others.  Fix the signal, you likely won't have
>> a problem.  As a rule, the trans ecu could care less what the actual
>> ABS sensor values are, it's only looking for the differences in
>> them.  The ABS computer on the other hand, is looking for actual
>> value *and* differences between them.
>>
>> HTH and my .02
>>
>> Scott J
>> 92 v8 4.2 ABT chipped
>
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