urgent help for error calculating the checksum

[mate89]

thanks for the confirmation Hugh.

[Errecinque]

certainly that should be calculated for each modification made on the file, it seems to me very strange that the interface is not you are correct, have you looked at if he writes it in the serial?

In serial I don't trust you to write it because in the reading it gives me a incomplete map.....I will practise to calculate it with winols....

[ugoboss]

on a lot of units is made, a reading of "incomplete" but this does not preclude the writing, the tool writes the one who reads.

[Errecinque]

on a lot of units is made, a reading of "incomplete" but this does not preclude the writing, the tool writes the one who reads.

the problem is that it reads the map key..

[ugoboss]

try posting the serial reading that you have done.

[sportknight]

made in serial without any problem,even without the complete file, but which require only the maps

[Errecinque]

made in serial without any problem,even without the complete file, but which require only the maps

With that tool ? I'm talking about the v54. And saw that in the bank data file, there are beds with this and they are also incomplete I assume that's the case. If no tell me the procedure to read only the map?

[Pasticciona0]

Now, however, I doubt there is a.....if I have to review the map then, working on the file already mod ever in the bdm I have to redo the cks file is also rimodificato? Or I can rewrite without re-calculate since it is already different from the ori?

Hello Errecinque, for every change that you make should be altered to the cks, it is not a question that it is a file that is already different from the ori, but a question of calculations of bytes...if you change even a single comma in the ecu is aware of it because the checksum does not match the result of the algorithm that calculates the control unit.
In practice, the cks is not a form control: the control unit takes all the information that we are in it, calculated through the algorithm, and verify the result obtained with that of the file written...if you do not match goes into protection.
I hope I was clear...if you're interested, I can post an extrapolation of a document that speaks of this...