Hi guys, I tried to build a pcb to read the M.E 7.5 . The only problem is that the circuit diagram that I found in a post here with the description of how to do it is different. In the diagram it appears that the ignition switch acts like the main power off, as the ignition line and the + power line are connected from the pcb to the ecu. Also the fuse that is suggested is only 250mA which should be 1250mA. I upload the photos and if somebody have some knowledge please give a help.

For my part, I use

-one old me7 harness connector
-odb2 to obd1 (2x2) adaptor
-multimeter wiring with banana plug
-current and voltage adjustable power supply

I don't use any resistor because I can limit the current on my PS

But an me7 ecu on the bench don't take more than 300mA if I remember. I'll check how many mA it take, next time I will play on my me7.5

Hi,

just use 62 as Klemme30 which is steady plus and 3 as Klemme15 which is ignition on.

No you mixed it. Its like i wrote before. the small one is steady and the big one is ignition.

Just have a look at a 1.8t wiring diagram via google.