[s-cars] RE: MTM ECU Problem (LAC)

[Mihnea Cotet]

Mark/all,

Software revisions don't have anything to do with VIN #s. On the same year
S4, I've seen up to 3 different ECU #s and about 3 or 4 different software
revisions. As far as total software revisions (for S4/S6s, if I have to
count S2/RS2, then there are even more out there), there are about 6 or 7
of them, and I only have 5, though I could find the missing ones even if
there's no actual point in that...
The point about software revisions/ECU numbers is that software versions
are made for a certain ECU number and even though one can use 551D chips in
a 551AA ECU, the result won't be the same because the software version for
the 551D chip isn't the same at all and the chips work differently in the
firmware part, even though the "software" part (lookup tables) are about
the some...

The motors are identically the same, agreed on that one, but the ECUs
aren't. There are a few different ECU numbers (551A, 551AA, 551B, 551C and
551D end numbers) for cars using the very same AAN motor.



HTH,

Mihnea

At 17:38 4/04/2003 -0500, Mark Strangways wrote:
>So..
>
>Given a 92 S4 and a 93 S4, what could the potential differences be between
>different versions of the factory software.
>The motors are the same thru the model(s) S4 and S6. Are there any
>differences in the motors that we should know of ?
>
>I think my 92 S4 has a ECU from a 93 or 94 S, and my TAP stage 1 chipset is
>in the other guys S.
>We did note that his didn't pull as well as mine did, but that doesn't
>explicitly mean the software is not valid for that VIN #.
>
>Do you know how many factory software revisions /  versions where made ?
>
>Mainly just curious :)
>
>thanks
>Mark S
>----- Original Message -----
>From: "Mihnea Cotet" <mik at info.fundp.ac.be>
>To: "DOUGLAS LANDAETA" <landaeta1 at comcast.net>
>Cc: "Fifield, Douglas" <Douglas.Fifield at TENNANTCO.com>; <wmahoney at disk.com>;
><s-car-list at audifans.com>
>Sent: Friday, April 04, 2003 3:16 PM
>Subject: Re: [s-cars] RE: MTM ECU Problem (LAC)
>
>
> > Doug,
> >
> >
> > My point wasn't about the wrong ECU in the wrong car because no such
>things
> > exist. Take a 91 S4 ECU and put it into a 97 (Euro) S6 and it will work
> > perfect if the chips inside it are made for that particular ECU. If you
> > swap chips from one ECU to the other, the car might not run as it should,
> > simply because the chips weren't made for the ECU they are used in. Such
> > things happen quite often and people wonder why their car doesn't work as
> > someone else's, which has the same chips in its ECU, and the point is *the
> > wrong chips in the wrong ECU*.
> >
> > But as I can't see the ECU, the car nor the chips in front of my eyes, I
> > can't commit for sure and thus I'll say YMMV.
> >
> > Cheers!
> >
> > Mihnea
> >
> > '85 coupe quattro - 20VT, soon to have 430+ HP (when time permits)
> >
> > At 14:11 4/04/2003 -0500, DOUGLAS LANDAETA wrote:
> > >Minhea noted:
> > >
> > >Blinking Engine light -
> > >-bad checksum in the ECU chips (not calculated correctly)
> > > > -chips not made on basis of the ECU number you guys are running
> > > > (which is
> > > > bad because there are several software versions depending on the car's
> > > > equipment and chips aren't the same in their "firmware" part)
> > >
> > >man-o-man-o-man - This sounds like the wrong ECU (dare I say installed)
> > >or being thrown into the wrong car. How can any reputable tuner, and I
> > >have heard that Anderson does fine work, allow this to happen? Many
> > >smaller, and less expensive Audi OEM parts are different depending on
> > >VIN.
> > >
> > >Douglas' car is one fine example of an *extremely* rare low mileage,
> > >well maintained Pearl Avant.  My Soapbox - to all the vendors,
> > >mechanics, tuners and the supporting industry that we spend our money
> > >in, which is saying a lot in this economy, QUALITY COUNTS!
> > >
> > >Doug L (if I'm off-base, I take it all back)
> > >94 S4
> > >
> > >_______________________________________________
> > >S-CAR-List mailing list
> > >S-CAR-List at audifans.com
> > >http://www.audifans.com/mailman/listinfo/s-car-list
> >
> > _______________________________________________
> > S-CAR-List mailing list
> > S-CAR-List at audifans.com
> > http://www.audifans.com/mailman/listinfo/s-car-list