Hello to all, as my first topic I would like to propose a big problem.
A customer has for months a touareg 2004 5.0 v10 stopped due to a faulty ECU .
I state that this customer has made the rounds of various people who eventually failed , so I found an ECU already disassembled with a lot of e2prom already fused back together ( I guess they read the file for the immo ) .
I realized immediately that the person who tried to restart the machine has completely ignored that the car has dual ECU edc16u1 , certainly convinced that he had only one ( because the first was not removed) .
The first thing I did was to clone the faulty ECU working with another . With the original ECU would not start even before the starter , with that cloned , but the car would not start .
I made a diagnosis with vcds and I discovered that on both units I get the error on e2prom with written MIL ON .
From here on in darkness :
The problem is that I do not know what has happened to the people before me , but most of what they put in is blessed e2prom .
I tried to open the second ECU and make a backup of everything.
I compared the files of the first and second ECU with a dial gauge track , and I noticed that the files read are all the same except the contents of the respective e2prom , than however remain the same no frame.
with a program I tried to remove the immo for avoiding problems but nothing always the same error.
I hope I have not kept you sleepy , but my questions are as follows :
1 ) what is the master and the slave ECU ?
2) The ECU must have exactly the same files , or the master must differ in something with the slave ?
3 ) the problem for the start-up is in the files of e2prom ?
4 ) someone has a backup with the respective ECU read in bdm ?
5 ) there is a file so-called "virgin" that allows me to put the machinery in motion without considering the immo and the distinction between master and slave ?

Thanks in advance to those who can give me an answer . i have translate from google..

I ve done several dual ecus. amster and salve must have same ecu. you can only read both by BDM, or by obd , switching ecus on the master conector.

they say immo is only in master...yes and no, becasue if info does not correspond to slave it wont work..

Just get both eeproms and make them immo, off or virgin a at the same time!

hi have cloned both ecu by bdm but the car don't start. after i tried to get immo off with immokiller on both ecu. but don't start.
i think the chk of both e2prom are wrong. i'll try with edc16eeprom calculator, because it calculate chk too.

i try do upload the files but i can't...

then the ECU now seem ok because I have no more errors in diagnosis except for the engine speed sensor g28. the mechanic assured me that have changed it before my work because it was convinced that not to start the car.

Then why do you think there is still an error in that sensor?