I'm not sure I can help much. A freely available checksum utility identified it as a valid .bin based on the checksum and gave it a mask ID of B4. It looks like your scan software identified the correct promid of 9969.
Disassembling a file can take time. Lots of it. I'm sure a few folks here who have some experience could help with tips and tidbits but just like delcohacking, it will likely come down to you doing most of the work. Sorry... it would be a cool project but it's a huge amount of time. :(
I did find this neat little manual online:
http://www.lotusm100.com/manuals/Ela...-Manual-v6.pdf
Does your vehicle use the same ALDL plug as what's on the ninth page?
The program in the .bin looks fairly simple. There is a lot of unused "space" in the code which you can see with a hex editor. I'm guessing the ecm doesn't interface with the gauges or control the transmission? If so you may be able to use a more common ecm to run the engine. The 36th page has an illustration of a cam driven crank/cam sensor which is very cool. It looks like it may have been designed to work with a "seven notch" DIS system similar to what was used in many GM four and six cylinder engines in the late '80s and '90s. The next page shows the same style ignition coils used with the seven notch systems. P.62 shows the same signals are used as with the other GM ignitions of the era and P.64 shows a module that looks like one from an '87 to '93 Cavalier 2.0 / 2.2.
If you decide to persue this route there are some significant questions to answer:
1) Is the crank signal compatible with the seven pin GM module, or can the Isuzu module be used with a different ecm?
2) Is the intake manifold valve in the Lotus manual present on the Isuzu engine? Can it be controlled by an alternate GM ECM with stock programming?
3) What is the CO potentiometer (P.132)? Is it present on the Isuzu engine? How does this part work in conjunction with the emissions system? Is it compatible with another stock GM ECM?
4) How much more do we not know about the Isuzu system that might impede success?
Good luck, and please keep this thread updated.
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