kg6dxn, you have PM.
Once my 20b conversion is done and stable, I'll get crackin' on the manual translation. Though I don't 'officially' know Japanese, I've watched enough anime and played enough Japanese Super NES roms to get an idea of what it could be. And for what I can't figure out, google has the answer
The ECU itself shouldn't be too different from the S5T2/FD ones. Every one has the same basic functions: Ignition & Injector outputs, CAS input, battery voltage, EC-AT & Cruise Control inputs/outputs. Chances are that it's a blend of both in the way of a FD's functions but organized like a S5T2
The only thing that would be difficult to deduce is the Cosmo-Specific and 20B-REW-Specific items like the GPS system.
In the interest of everyone, how about we each take a section or a few pages and work on it? This thread could be stickied as a progress/assignment thread to keep everyone on the same page.