OK, I don't think I was that clear about used ECU's .................
When I started the V8 Project, I bought about 10 "SLK V6" ECU's from Flea of the Bay, Amazon and a few breakers yards, all of them were advertised as suitable for R170 SLK 320 V6 ...............
Of that circa 10 only about half of them were, the others would not work the Cruise LIM nor would they allow the Car to crank over !!
More work revealed that once I separated the bottom Casing Plate from being bonded to the PCB and viewed the "underside" of the PCB there was a load of extra SMD Components on the R170 (regular Ignition Switch) ECU's, these components were not present on many of the other ECU's I had bought which were supposedly suitable for R170 320 V6 !!
Clearly these ECU's were not suitable for R170 V6 as these would not allow the Car to Crank Over nor did the Cruise / LIM work !!
So, next up, I got all clever and took the extra SMD's from one of the correct ECU's and fitted them to the V8 ECU, still no Crank, still no Cruise LIM.
I concluded that there was not only hardware differences but also software files differences in one of the chips, but I couldn't find that difference in the 3 files I could access with my equipment
I gave up and added extra Coil and Injector drivers so I effectively converted a V6 R170 ECU to run the M113 V8. That also meant changing the mapping s/w to V8 etc etc.
The specifics are something I'm not gonna divulge publicly, they have no bearing to Petri's issue.
I had help from a few guys who actually earn from doing these conversions, and so if anyone reading here wants to be a clever dick and pm me to find out how it's done, you will get ignored !!
So, my point is to get the correct R170 V6 ECU do not believe what a seller tells you, buy based on part number only, and the 3 p/n's I have given definitely work.
There may be others that are suitable, but they are the ones I KNOW will work
and 3 years ago when I was spending a bunch on ECU R&D fodder they were the popular ones that I could get hold of fairly easily
Also, don't forget @Petri68
you will need to get that ECU Virginised by someone with the correct kit, and do "Initial Start Up" using SDS ..... Screw up the Initial Start and it needs Virginising again
ATM until you know what the Drive Auth is / isn't doing you will be playing "Parts Darts" because you do not know for sure what the fault is right now !!
So my next reply will be when you have actually done what I asked and posted screen shots of the Drive Auth Data in ME and in DAS / RF Modules, we need to see the Key Data, and Drive Auth Data.
BTW, somewhere on this forum, I posted screenshots of exactly where and how to find Drive Auth and Key data, the DAS / RF isn't labelled as DAS / RF it is IIRC IFZ or similar, and finding Key info was also hard to find but it is their in one of the HHT menus of IFZ.
I am very busy right now, so you will have to use your own time and the Forum search function in order to help yourself