So who can build a cax file?

[Whipped383]

Anyone interested in helping out guys with 4x4 that have done the 411 swap? there is now a tune that makes everything work right but the problem is no cos support and the part that makes the lo shift properly is in the system file.

[joecar]

Making a COS is not as simple as making a CAX...

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;

to make a COS: you look thru the program portion of the raw binary file looking for a suitable place to insert a call to subroutine, and then in an unused portion of the binary you add code which defines the subroutine to perform some task or calculation (e.g. look up a new table that you're adding) and integrate the value into a register which the caller was using, and return back to the caller; then in an unused data portion you define the new table; then test that this works; and then do the same thing over again for each different OS since the code/table locations will be different;

you can see both are not simple, and are very time consuming.

[joecar]

What OS are you currently running...?

Is there any way to run any of the OS's mentioned in the COS tutorial pdf...?

If you run one of those (with all 4x4 functions working correctly) then would the corresponding COS work...?

[Whipped383]

Well the os I am running is 12212156 but its the same os as a 2wd or 4wd. I have a l31 with the 411 pcm swap so the tune came from an 02 express van that uses that computer and there was never a 4wd van. Mike took an S10 file and did segment swaps and made it work. So the cos I need would be a 02020003 but its 2wd the 4 low doesent work with it. Heres a link to the problem several of us are facing http://forum.efilive.com/showthread....nversion-issue so either getting the lo working with the cos or getting boost tables in the functioning tune I have either way will make me happy. Its going to take someone with alot more knowledge than me though

[joecar]

I take it there is no 12212156 with 4x4 functionality...

[Whipped383]

I couldnt tell you on that I would assume that the s10 zr2 our current tunes are based from have the same operating system. That would be a guess to is maybe if it is a different os we can find a cos file for it then do segment swaps like was done to make this one work

[ScarabEpic22]

If you are running 12212156 then you can use a COS...not sure what the problem is here?

Upgrade to a COS, cal flash your current calibration into the PCM, then read it back out and modify that.

Does the 12212156 OS not provide 4 Low?

[Whipped383]

Yeah the 4 lo doesent work with the cos and for that matter didn't even work in th first place it was created from others by doin segment swaps

[ScarabEpic22]

OK so can you upgrade to a COS, read it out then do a seg swap? The OSs will be different and this might be an issue, dont know if EFILive lets you do that. Maybe you can request that functionality and test if it works?

[Whipped383]

I know guys have tried using a newer cos and doing swaps but they won't even run . If you readx the link I posted earlier you will see mor of the problem. Whatever it is that makes the lo work is in the system file so seg swaps don't even make it work