CAX and CMD, CME

[Red66]

I'd like to know ( before testing it ) if CAX file allow to modify data in the OS segment ?

thanks,
Marc

[GMPX]

Potentially yes because of the way the Cummins ECM's are designed........you do understand the risks though right? Cummins ECM's can be bricked just by changing calibrations the wrong way, changing code the wrong way could be just as tragic.

[Red66]

Yes, I do understand :)

thanks,
Marc

[DemonDMAX]

You can romboot the ecm if it is bricked via bench harness!

[EverydayDiesel]

how exactly are you guys creating cax files?

[MICK]

It all started a long time ago

[KhakiCummins]

From another thread



...

to make a CAX: you look thru the data portion of the raw binary file to see if you recognize some pattern as a table, you determine the format/units of this table, you test it (edit and view resulting operation), and then include the address/format/units of this table in a CAX file so that when you open the calibration with the tunetool it shows this table; and then do the same thing over again for each different OS since the table locations will be different;

...


Base on this (]https://forum.efilive.com/showthread.php?9105-Please-Read-First) thread, the CAX files is just a simple text file. It's finding the data you need to create it that will be the challenge.