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

[Fifield, Douglas]

This message is in MIME format. Since your mail reader does not understand
this format, some or all of this message may not be legible.
--
[ Picked text/plain from multipart/alternative ]
Mihnea wrote:

"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"

So, Mihnea, does that mean that if the entire ECU is swapped, you are OK on
revisions?  All I know is that when I did my upgrade, Keith Anderson
extracted my virgin ECU and stuck in a different one with the 3-bar sensor
and two different EPROMS.  Do I need to worry about software revisions and
incompatible chips?

Douglas, puzzled in MN
95.5 //S6Avant - mine
98 Mercury Mountaineer - her work sled
98 Toyota RAV4 - for sale
73 BMW R60/5 - lonely in the garage