checksums

[neilmch]

Does the checksum need to be the same on every file you modify and load to your ecu, so your ecu will be looking for 12345abc (exact same checksum as origional file) to know the files good?

Or does the checksum differ on every file and is not specific to that ecu?

Thanks

[br556hre]

checksum is a value used to verify the integrity of a file or a data transfer, so it cannort be the same for modified data.
Anyway there can be multiple levels of checksums.. just google about it, read and you will undserstand.

[xlinuxasx]

Is it possible that my car doesnt start after installing tuned file with winols checksum, but Im installing it via Mpps, wich does its own checksum?

[bobolin4o]

Is it possible that my car doesnt start after installing tuned file with winols checksum, but Im installing it via Mpps, wich does its own checksum?

It depends... what car?

[xlinuxasx]

Passat b6 2.0tdi 103kw bmp engine

[bobolin4o]

EDC16U34... with ori file back it starts?

[xlinuxasx]

Yep, original is all ok

[bobolin4o]

so, disable all checksum correction (with restore original data) in your winols and flash it again... you will see...

[xlinuxasx]

Damn, It didnt work

[bobolin4o]

Have other tool?
When you want to flash... MPPS ask you if you want checksum correction, or not?

[xlinuxasx]

No, just winols and just Mpps to install.
Mpps dont ask for checksum.
I have another tuned file, and it works after install. Maybe its something wrong with tuned file

I see in winols that original file has potential 209maps, and tuned 211maps. Maybe its bad file or something

[bobolin4o]

No, just winols and just Mpps to install.
Mpps dont ask for checksum.
I have another tuned file, and it works after install. Maybe its something wrong with tuned file

I see in winols that original file has potential 209maps, and tuned 211maps. Maybe its bad file or something

So... you answered yourself to your question... your file is other software version. You are lucky, that you didn't "kill" the ECU with it!

[xlinuxasx]

Yeah, thanks for help!

[neilmch]

I have been reading google to understand what has gone wrong with a file i wrote. From what i gather the checksum is a way of the ecu verifying that the code is correct, if it doesnt add up to the sum its looking for it knows that data is missing or corrupt. My origional file has a different checksum to the files written after,

So just to clarify the checksum can be different on a written file to the origional?
The ecu will use the new checksum to calculate if the data on that file is correct, so as long as all the data lines in that file have correct checksums the ecu will like it?

[bobolin4o]

So just to clarify the checksum can be different on a written file to the origional?
The ecu will use the new checksum to calculate if the data on that file is correct, so as long as all the data lines in that file have correct checksums the ecu will like it?

1. Yes, the checksum can be different.
2. Yes, that is the point of the checksum at all.

Will be good if you post both files, so we can check if there is something wrong...