[s-cars] NAC: ABS MIL

[Toborg Michael (AC-SM/ESC3) *]

In theory, ABS needs to have all wheels the same rolling radius, but the
system should be able to compensate for the ~3% difference. If the
difference were a little bit bigger (5-6% difference) there might be a
problem. 3% is kind of near the border on what can cause a shutdown.
So, that could be the problem yes. If the MIL comes on after some
driving, it must be the difference in rolling radius, if the MIL comes
on at key up, that would point to some electical problem.
HTH
Mike

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of Igor Kessel
Sent: Friday, July 08, 2005 12:52 AM
To: Audi S-list; Audi Q-list
Subject: [s-cars] NAC: ABS MIL

Folks,
I am posting this on behalf of one mechanically challenged doctor friend

of mine.
The patient is a 1996 Volvo 850, 20v turbo 5 cylinder, auto. An ABS MIL 
in his car was interpreted by the dealer as "come on in and bend over, 
we'll screw you good". As we all know, 99% of problems with car 
electronics happen due to bad connections, yet the dealer wants to 
replace the ABS controller. Surprise surprise...

Anyway, it has just occurred to me that the ABS controller may not like 
the fact that his front tyres are stock (205/55/16, yeah, just like the 
Audi :), whereas his rear tyres are smaller by 20mm (205/50/16) - did I 
mention that my friend was a doctor and could hardly tell a steering 
wheel from a spare wheel?

Methinks that the 3.3% of rolling circumference difference and 20 extra 
rev/km are enough to trip the ABS MIL. Is it too far fetched or is there

any merit to this suspicion? I have a gut feeling that the ABS 
controller is not his problem.

Any opinions? Thx in advance.

-- 
Igor Kessel
two turbo quattros
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