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So, I send my ECM to a repair shop and they can repair it. They said the internal power supply is damaged. Looks like I got a voltage spike from somewhere. And now I come back to my first question. Can it be, that this piece right from the ECM it there to protect the ECM?

Sorry, that is not correct. My ECM is in a repair shop an the internal power supply is damaged, not the battery. And this happened as one of my 12V batteries had an internal shortcut.

Thank you. Interference filter for what? To protect the ECM? My ECM is dead, because of an internal shortcut from the batteries. I know interference filter with AC current, but not with DC current. Does anybody has the serial number? Then I would try to find a technical data sheet.

Hallo, sorry to ask you. But knows anybody, what this is? It is right from the ECM and it isn't connected to anything. I mean this thing with the serial number MFR-.....??? Thank you