[s-cars] Exceptionally lame question

[Keith Maddock]

Calvin,

Thanks for the info.  This could go a long way in explaining another reason why Audi ABS from the 80's and early 90's seems to be a bit crude and underoptimized for each vehicle application. (the benefit of that being that its is less sensitive to gross changes in foundation-brake components such as UFO->G60 or BigRed upgrades)

Our connectors also have very positive engagment with clamping levers (similar to the ECU connectors).  Don't really want these suckers working themselves loose as intermittent wiring for wheel speed sensors and ABS solenoids could lead to "interesting" braking control...

Keith

Disclaimer:  The contents of the message above reflect only the opinions of the author, and are not to be construed as reflecting the opinion of TRW Automotive in any way.

****************************************************************
Keith Maddock, TRW Automotive,  Koblenz, Germany
Slip Control Systems, Systems Design, Traction Control
+49 (0)261/ 895 2474     -    -    keith.maddock at trw.com

>>> "Calvin & Diana Craig" <calvinlc at earthlink.net> 06:31:07 10.09.2002 >>>
Keith,

All the ABS units on the 200's and the S4, to my knowledge, reside under the
rear seat.  The connector is one very large connector that has a very
"positive" type engagement to it, i.e. nice little clamping lever and
stuff...kind of reminds me of some of the ZIF connectors on our test sets at
work.  Whether the box that you are talking about is or is not the ABS box I
am not sure.  But I am sure that the ABS box resides under the rear seat.  I
have actually diagnosed a bad wheel sensor on my '89 200 without having to
ever take off a wheel as the connector provides a convenient tap for the two
wires leading to the sensor.

--Calvin


-----Original Message-----
From: s-car-list-admin at audifans.com
[mailto:s-car-list-admin at audifans.com]On Behalf Of Keith Maddock
Sent: Monday, September 09, 2002 2:33 AM
To: s-car-list at audifans.com; irautenberg at comcast.net;
aaront at cox-internet.com; ingo at waratap.com; pizzoman at yahoo.com
Subject: Re: [s-cars] Exceptionally lame question


I'm going to suggest that this is NOT the ABS unit, as to my best knowlege
the ABS electric control unit (ECU)  is directly attached to the ABS
hydraulic control unit (HCU).   However I don't have ready access to a UrS
to confirm...

I think in times past, there have been production ABS systems with ECU
remotely located from the HCU, but these mounted the ECU much closer than
the rear seat. (Not having to mount the ECU in the engine compartment
probably allowed them to use  cheaper spec electronics since the heat range
of the environment was smaller)  ABS controls brake fluid flow via
electronically controlled valves (there several different types of methods
of doing this but most systems now seem to use a electromagnetic controlled
plunger-type design).  Due to the very rapid nature of ABS control, the
length of wire between the ECU and the electronic actuator on the valve can
have a significant effect on controlling the valves, so the ECU tends to be
as close to the HCU as possible.

Instead, this may be the control unit for the locking rear diff?  I know
this is located in this area. However if you have a 95.5 avant with
ABS-based EDL rather than the electronic locking diff, this obviously could
not be the case.  Aaron do you have a 95 or a 95.5 ?

Keith "wondering about wiring in der fatherland" Maddock
93 S4 in Oregon
968CS hopefully soon in Germany

****************************************************************
Keith Maddock, TRW Automotive,  Koblenz, Germany
Slip Control Systems, Systems Design, Traction Control
+49 (0)261/ 895 2474     -    -    keith.maddock at trw.com

>>> irautenberg at comcast.net 01:43:08 07.09.2002 >>>

----- Original Message -----
From: "Joseph Pizzimenti" <pizzoman at yahoo.com>
To: <S4audinut at aol.com>; <aaront at cox-internet.com>;
<s-car-list at audifans.com>
Sent: Friday, September 06, 2002 7:24 PM
Subject: Re: [s-cars] Exceptionally lame question


> Isn't this ABS related?
>
My guess would be yes, that it's the electronic control module.  Got a P/N?
If it's 4D0 907 379 J, then most assuredly so!

Ingo

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