Hi,

i have read here http://nefariousmotorsports.com/forum/index.php?topic=2973.msg33344#msg33344 and here http://nefariousmotorsports.com/forum/index.php?topic=915.0 about the socalled deathcode and trying to eliminate my DTC P0605 - 16989 - Motorsteuergerät - Fehler ROM-Speicher

So i read my 24c02 and another 06A906018AQ D04 out of ebay (looks like never touched before).
I have 3 unerasable errors (on the bench) and one of them (deathcode) is unerasable while in the car.

my ecu


ebay ecu


my file vs. ebay file
i chanced the stuff in the red mark but the DTC remains


my file vs. ebay D03 file


So my question is:
Where is the SKC stored? (to not focus on the position / blind it out)
What is the stuff in the red box?
What about the other differences?

I do have ...AQ D03 files to but there are more changes so i will not focus on this.

As you may noticed, english isnt my mother tongue


edit: just notices that vagcom says my ecu is D03, is it out of the flash or from the eprom? box is 04 from the outside but tune is D03 maybe...


 

I'm under the impression that cars that use the 24c02 don't store the SKC in either ECU eeprom, only in the cluster, but I could be wrong about that.

Immo II 95040's don't store the vehicle's skc, vin, or immobilizer info, and I believe that 24c02's behave similarly.

yes, your first and seventh lines look exactly the same, and they should, I agree.
the seventh line is a backup of the first.  backup pages and checksums are how the ecu knows whether it's data has been corrupted or altered.

I'm saying that I don't believe that the last two bytes of those lines are correct.  

Those last two bytes are checksum bytes, that need to be corrected when the immo-value is changed.

I think that your first and seventh lines should both look like the first line of the attached image.

edit:more specifically, the last two bytes of the first and seventh pages should be [16 FA] for your immo-on file.

16 if immo on, 66 if immo off.  It seems you're all sorted out, glad to be able to help.
-Cyril

I immo offd the file from the ebay D03 Ecu and flashed my tune so its a nearly 1:1 copy of my ecu. It has the same Bosch Part Number by the way.

The ebay ecu has 0 errors, my has 3 errors. (on the bench)

Next step would be to write the 0errors immooff file to my original ecu to see if the 3 errors will disappear.

My ecu is back in the car and i only have one ABS brake error remaining because its a converion into another car.