You found a lot of good stuff in there! I agree, that does look like reflash code. The magic numbers in the chunk at EA1F8 looks pretty familiar.

If the same commands over the VPW bus can be used...

I'm not able to open that IDB file because I'm using a relatively old version of IDA.
If you can export it to an IDC file (script) that will probably work for me.
Thanks!

There might be a reflash routine in the operating system, to store check-engine-light codes. I didn't realize that about 411 PCMs until we already had 411 flashing working, but the code gave me a...