Multiecuscan

I got specific problem. When key are i ON position I cannot connect to body/ecu. Otherwise, when OFF, normally comunicate, but cannot discover other modules by CAN connected. This obviously implicated problems with proxi.
Patient - ducato 290MCA, sgw bypass applied.

Try disconnecting the SGW Bypass. If you can then read all the control units etc. then I would suspect and bad SGW Bypass adapter. Also ensure you are using the correct adapter cable for the various control units.

Another point to bear in mind is that some later Ducatos have the SGW implemented in the Body Computer so one can not externally bypass the SGW.

Finally I have solved this problem - was with broken elm converter.
Anyway I found problem with multiecuscan ver 5.3 - during proxi aligment, shall configure TPMS without grey adapter. Not with, like now.