undefined rom constants

[hexdmy]

Working on a KA-T car recently, that has a strange timing retard issue, I've been looking through the tune trying to figure out what's going on. I read out the tune and copied all of the mapping back to stock, and then compared the bin to a stock bin and found that there were nine rom addresses still changed, but not defined in any of the Nistune address files. I'm not the best at assembly, but looking through it, at least one of these constants appear to be a rev limiter, and is located in the ROM address area where other speed/rpm limiters are located. I'm wondering if anyone has any additional info as to what these address do.


Address / Standard 54C00 / Unknown tune
0x0012 / F2 / FF / (no idea)
0x0013 / 82 / FF / (no idea)
0x0343 / 3C / FF / (Part of the TP Load Limit routine)
0x05C2 / 1E / FF / (rev/speed limit area)
0x05C4 / 28 / FF / (rev/speed limit area)
0x05CC / 38 / FF / (rev/speed limit area)
0x05CF / 0F / 00 / (rev/speed limit area)
0x0FEF / 26 / FF / (no idea)
0x0FF0 / 42 / FF / (no idea)

[Matt]

They seem to be after the values for existing rev/speed limiters

There are no definitions that I'm aware of. Is this BIN from a Nistune or third party board? Did you do a consult download to get the image out?

[hexdmy]

The ecu has a PLMS board installed, I used Nistune to read out the bin.

[Matt]

Looks messed up. Whoever did the tune had bad definitions