NefMoto

Hello,

I tried to do immo off on the attached files, is this correctly done ?´

Thank you

I don't know why you try to modifiy/erase adaptation values and DTCs. Test it.

Thank you very much.

I tried it on another example but somehow I have a Problem with checksum here, because when I increase B2FB by 5000 it gets one Digit more ? So for example F9FB is +4700 but how to go higher, as I Need +5000 ?

Line to Change is A0 FF B2 FB, A0 gets 50 but I am not able to calculate the checksum, can anybody explain how this works on this example, file attached.

Thank you

Take a look mate,
http://nefariousmotorsports.com/forum/index.php?topic=4738.msg46563#msg46563
http://nefariousmotorsports.com/forum/index.php?topic=6204.msg57875#msg57875

Hi,

thank you again  :)

So my checksum B2FB get 9EFB because A0FF is located on 0x0000 and 0x0060, am I right ?

So the attached file should be ok ?

No mate you need to correct checksumm properlly. Look at it carefully:

(http://nefariousmotorsports.com/forum/index.php?action=dlattach;topic=4738.0;attach=7395;image)

Hmm I am confused now, there is "when you see A0 in 0x000 and 0x060 / 0x070, then change A0 to 50 and not calc the sums, change it to 9E"

And if I want to correct checksum its not possible as I cant increase B2FB by 5000, can you please help me one more time and explain what I am doing wrong ?

Thank you

TC1767 when you decrease A0 by 50 you need to increase checksum the same amount.

Yes I know, but I am not able to do this :-(

I can Maximum add 4900 to it.
Can you please help me ?

B2FB + 50 = B34B according to windos calculator ? Is this ok ?

Your checksum according to your original file is 0xFA41, so if you add 0x50 to that it would be 0xFA91.
 

Thank you for your answer but you used the first file posted, this was already solved.

My original checksum is B2FB and I cant add 0x50 to that.

Ok, still wrong though... Checksum in that file is FBB2, +0x50 is FC02.

Friends take a look, it has been posted previously, in the forums.

(http://www.mediafire.com/convkey/3296/ca2f706awcu70774g.jpg) (http://www.mediafire.com/view/?ca2f706awcu7077)

What I still dont understand is, my Hex Editor Shows:

A0FF -> 50FF = difference -5000

Checksum: B2FB (FBB2) -> FC02 = difference +4907


In my opinion the checksum FC02 is also not ok then as it should be +5000 ?
Is there anybody who can help me out with a 100% solution ?

The checksum is stored as lowest byte then highest byte so in the example the checksum CFFB is stored as FB CF.

Back to your case, your checksum is FBB2, adding 50h to this gives FC02 which will need to be stored as lowest byte first so in the file it would be written as 02 FC.

Its still not clear to me as checksum 02FC shows as difference -AFFF in my hex editor in relation the stock checksum, shouldnt it increase and I can see difference +5000 (which matches 0x50) like in all other files done here ?

I think this file is pretty different to all others so its hard to do :-(

Is anybody here able to solve this ? I am also open to pay for it but I really want to have the correct way.

From my little experience many of this Motronic ECUs stores data in little endian format. Then going from A0 to 50 only (minus 50h), you disable Immo, but checksum is stored in the last pair of byte in little endian format. You need to swap it to let understandable, work it and swap it again to store it. Then you only need to add 50h (previously sustracted) to that checksum. Byte at right side of A0 or 50 is not related to this procedure at all.

Mate write this one and all oke..

No problem..

MK2=VRT your file is not ok :) A0 value is unchanged

anyway , try this and report ! :D

Thanks for watching, i forgot to change that bite (50), my mistake.

Did you sort this out? I have done just over 50 AGU ecu immo off. Let me know if you need help.
That picture on previous page showing how to do it is incorrect for what you want.

Hello,

I still have issues, car starts and goes off again, ori and mod file attached.
Would really apreciate your help.
Is the attached file ok ?

Looks fine to me. Have you tried that one? Are you sure you have put the chip back on the right way, and all pins are soldered ok?

Yes, I have a stock ECU here to compare, all fitted correctly.
Can this be also an issue of a wrong fitted Am29F200 ? But VCDS can connect to it and MPPS can write a file by OBD so it should be fine.

Unlikely. Starting then cutting immediately is immobiliser. Touch all 8 pins with a soldering iron. I have had one before that looked fine, but wasn't. Why was the am29f200 removed?

No, I also had this one time when AM29F200 wasnt connected properly, started and was off again.
I was removed from another tuner, dont know why, I flashed back to stock.

Is there any problem when I rewrite the original 24C02 ? Or better to take a new one.

AM29F200 can be written several times, to not say many many times. If you have issues with ECU why not make ECU OEM again as a start point (I mean OEM info in flash & serial eeproms) re-check and re-pass solder over those ICs and test ECU on bench.

Probably not much help, but here's a .rar file of every AGU immo off I've done. If not to you, may be helpful to someone who isn't sure what they are doing.

Nice info mate.....  ;D  ;D  ;D

Finally, thats really helpfull, thanks for that :-)

Thank you :)