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Turned out to be corrosion inside one of the ECU connectors.
Several wires inside the connector had no connection at all with the ECU. Among them one that went to the main relay which explains the "blackout".
Up 'n running again 
Thanks for your answers. The wiring diagrams will be useful, need to fresh up my german first 
The car cranks but that's all. I hooked up my Lexia today but "nobody home", couldn't connect to any of the modules. Tried Autocom and managed to connect to the BSI but the same "Cannot connect to ECU" - fault code.
Feels like some kind of major electric thing. Have checked all fuses. So, time for the multimeter.
Thanks for your answers!
The car ran fine when I parked it in the evening. Next day it wouldn't start.
Hi there!
I have a MY2006 Jumpy with 2.0 HDi (DW10BTED+) engine. It wont start.
I've checked fault codes and the reader cannot connect to the ECU. There's an fault code in the BSI saying "No connection to the ECU".
I did some googling and found people having issuses with the fuel pump relay which could cause a unable-to-connect-to-ecu. I tried a new relay but no difference.
I intend to dig a bit deeper into the electronics but I thought I check here first if someone have had similair faults and have any ideas where to start?
And also, I've been googling for wiring diagrams but hasn't found anything of value yet. Anyone here who know where I can find such?
Best to you!
Thomas
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