View The Full Version : urgent help for error calculating the checksum

Errecinque

I have the following problem. I read in bdm a ecu marelli mjd602 Opel meriva 75hp. All good reading with the three files eeprom 4kb, micro 513kb and flash 2048kb. Open the file with ecm that does not have the drv exact but not bad. I edit the file in 2d and except. Then I have the doubt of the cks.......I open my ecm I try to do the calculation of the cks , choosing the family 76 fiat/Opel /Suzuki mjt, but is error during the calculation. Also trying to write in bdm to the flash V54 tells me before beginning writing that the cks is not supported, that I stopped to not make a mess.Can you tell me what should I do? If I write it so definitely not a party to las machine, or am I wrong? Thanks to all

alfy

Try to write the mod files without the chksum with ECM.
Ill go re-enter the file ori with BDM if it does not.

ugoboss

the cks are to be corrected, in the mail file ori and mod that let's correct it.

Errecinque

Thanks Ugo for your availability. Here are the files....there are precisely managed.

Errecinque

I managed to load a compatible driver in the file ori, even if it is not out of the family of the cks. I enclose a photo sequence from 1 to 6 and the file, theoretically, with cks correct (even if the first attempt gave me error) to know if I can upload it that way, because in 2d, not seen in the mod that could be those of the cks

legendaryslave

if you write by bdm we think the interface to do the recalculation of the cks

Errecinque

if you write by bdm we think the interface to do the recalculation of the cks

At the time of starting the writing tells me cks is not supported.....if I go ahead with the programming, what happens then?

legendaryslave

Then no to be calculated first

antonios25

Good evening ercinque, etc official the ago drive the calculation of the cecksum otherwise you will have to see if the interface makes it in the car

munro

try to see if winols you system the cks....

legendaryslave

here you go with cke done

mecdoc

Winols calculates without problems

Errecinque

Thanks legendaryslave, very nice. Today I feel everything and I'm reporting on and

Errecinque

However, I would like to know technically what is preventing the ecm to calculate the cks, since that is also a compatible driver.

Errecinque

Update....the machine is match cks in place, thanks to all. I just want to indicate to other users that this machine is read in serial with the v54 is not complete, do not read the part of the main map with the maps the pedal and all limiters. Now I'm reading with mpps to see what comes out. Then I tell you. If no, only bdm

antonios25

Experience on Ford, Mazda and opel, it's always worthwhile to read bdm. It is true it is a Bit of a drag but if you can always read in bdm all the cars that supports this type of reading, so for every eventuality, there is always a complete file to resolve the problems

carlo abarth

made always.!!!! go on the safe side!!

Errecinque

mate89

according to my miserable experience must be recalculated whenever you make any changes, but expect some other confirmation.

ugoboss

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?

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.