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Ok, I'm working on a project, however, I need some pictures (if possible) of your ECU's. I need one from each year from 91-94. I need the pictures of the actual boards and the pinouts. I have a few pics of JDM ECU's, but I'd rather be 100% certain of the USDM ones.

So, if you have your ECU's out of the car, for whatever reason, you'd be doing me a HUGE favor if you could snap these pics!

Maybe vrg3 can help with this one:

89-91 JDM ECU's used 27C1024 socketed EEPROM, whereas from 91-93 they used a 27C1028 non-socketed EEPROM. Do you know if this holds true for the USDM models as well? This is one of the things I'm hoping to verify with pictures.

I'll be yanking the ECU out of my '93 the first chance I get to get pics, but I was hoping some of you may have already done so.

why?

JasonGrahn wrote:why?

Well, I had assumed it was obvious.. but it's slated along the lines of ECU hacking. Whether it be by software or hardware, that hasn't been determined yet.

Need a pic ? Ask Morgie ! hehe

click the "get originally uploaded picture" to see the high-res one.

http://public.fotki.com/morgie/morgie/l ... 9_img.html

http://public.fotki.com/morgie/morgie/l ... 0_img.html

http://public.fotki.com/morgie/morgie/l ... 9_img.html

http://public.fotki.com/morgie/morgie/l ... 0_img.html

http://public.fotki.com/morgie/morgie/l ... 1_img.html

morgie wrote:Need a pic ? Ask Morgie ! hehe

click the "get originally uploaded picture" to see the high-res one.

http://public.fotki.com/morgie/morgie/l ... 9_img.html

http://public.fotki.com/morgie/morgie/l ... 0_img.html

http://public.fotki.com/morgie/morgie/l ... 9_img.html

http://public.fotki.com/morgie/morgie/l ... 0_img.html

http://public.fotki.com/morgie/morgie/l ... 1_img.html

Oooh! What year is this, BTW?

Canadian '92 manual Turbo Legacy

Awesome, thanks morgie!

I don't have any pictures handy, but let me give you the information I have handy:

All North American Legacy Turbo ECUs have the same construction. They look internally just like the one in morgie's pictures. Just one circuit board.

There are five different part numbers: 22611AA690 through 22611AA694; each one superceded the previous one. 22611AA690 through 22611AA692 were used only in the 1991 model year. Near the end of the 1991 model year they switched to 22611AA693, which they kept using until partway through the 1992 model year, when they switched to 22611AA694. 22611AA694 was used from then until the end of the 1994 model year.

The differences between them appear to be primarily in the programming.

The ECU's EPROM is a 27C256, but it's soldered on. There's a very weird blue 30-pin male very wide socket around the EPROM, presumably for installation of an upgraded ROM. You can see these in morgie's first picture.

The processor is a Hitachi HD6303-series and it's supplemented by a Hitachi HD63140 universal pulse processor to handle most of the I/O.

The pinouts of the ECU itself are described at http://www.graphics.cornell.edu/~v/ecupins/. I have not been able to find the pinouts for either of the two aforementioned Hitachi chips, frustratingly.

I have more notes on the circuitry somewhere...

If you tell me more about what you're trying to do, maybe I can help. It sounds like you're trying to do what I'm trying to do.