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

[Russ Panneton]

I have to guess (danger!) that perhaps the reason the ECU part numbers are
different is for the different firmware revisions.  Since the PROMs are
soldered into most of the ECUs, the only way Audi could make a running
software change would be to rev the ECU part number.  Of course, there may be
some actual hardware changes, too, but my money is on Audi tuning the
software, not the hardware...

Russ

On Fri, 4 Apr 2003 18:15:54 -0500, "Mark Strangways" <strangconst at rogers.com>
wrote:

>So, the revised code on the chip deals with changes in the ECU, not in the
>code operating the motor ?
>So, as long as the ECU has the correct base chipset that was shipped with
>it, or it is known, then the correct modified chipset can be installed. I
>mean to say that the 551D chips need to have , for example, the MTM stage 1+
>551D code written to it.
>
>The different software version have no impact on engine management ?
>Thanks
>Mark
>----- Original Message -----
>From: "Mihnea Cotet" <mik at info.fundp.ac.be>
>To: "Mark Strangways" <strangconst at rogers.com>
>Cc: <s-car-list at audifans.com>
>Sent: Friday, April 04, 2003 6:06 PM
>Subject: Re: [s-cars] RE: MTM ECU Problem (LAC)
>
>
>> 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
>> > >
>> > > _______________________________________________
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>>
>
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--
Russ Panneton                          russ at s-cars.org
Nederland, CO              "Too bad ignorance isn't painful"