I spent way too much time analyzing the ECU part numbers at car-parts.com. Here's what I found. Legend ECU's are numbered thus:
The first 5 digits are almost always the same.
The next 3 digits seem to designate Type 1/2.
PY3 == Type 1
PX9 == Type 2
The next digit seems to indicate emissions.
A == FED
L == Calif.
C == Canada?
The final two digits appear to be software revision numbers, larger is newer I assume.
Here are some oddballs that I found:
For 1991-1992, the FED Coupes and Sedans seem to use the same part numbers 37820-PX3. The auto trans cars use -A52, -A53, and -A55. The manual trans cars use -A02, -A04.
For 1993-1995, it gets more complex. The auto trans units seem to use the 37820-PX9. An exception seems to be the L Sedan Auto which uses the PY3-A57, -A58, or -A72.
The 1993-1995 GS manual trans uses a PY3-A09. The manual trans coupe LS uses a PX9-A17
I haven't catalogued the California numbers. But the trend seems to be the same: low software numbers are for manual trans, and higher numbers for auto trans.
I think it would be a fun project to create and publish a software library of all these original Acura ECU programs. I DO NOT advocate cloning aftermarket ECU programs such as Bayou.
Think how much easier it would be to swap engines or transmissions if you could simply reprogram your ECU for the proper combination? I wonder what differences in power or drivability there are between the different revisions?
OK so here's the part number from the six speed I have 37820-px9-a05, I can't find the A05 anywhere.
I guess the car you're referring to is the one listed in your vehicles to the left right under your name.
If that's the case it wouldn't give any meaning listing your ECU code since your car has been modded. No 92 Legend has a 6-spd transmission. It doesn't make sense if you're trying to make the numbers provided here seem wrong.
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