Ok, I have exactly the same ECU, with only one connector.
I found an interesting stuff :
http://imageshack.us/photo/my-images/805/schemaborniercalculateu.jpg/
but there's only the half of it...
I found too that the same ECU was mounted on Nissan Altima, and found the pinout. But the numbers doesn't match with the subaru one
Hope this help...