[mattydr67]

Multiecuscan original or cracked?
Fiat Ducato type 250 - Magneti Marelli IAW 5SF4 or Bosch EDC16C39 CF4 are on K-line.
Fiat Ducato type 250 facelift - Bosch EDC17C49 CF5 or Marelli 8F3 CF5/CF5+ or Bosch EDC17CP52 CF5/CF5+ are on CAN BUS
The other controlers needs adapter A1 or A3

So test your interface in other CAN BUS controlers in other cars.
Check also in kline cars too.
If it doesn't works i n any cars CAN BUS controllers then you have to remove the 120 ohm resistors from pins 6 and 14 ( CAN BUS transciver pins 6 and 7 )

If the interface it is ok on CAN BuS in other cars and you are using cracked multiecuscan then this could be the problems.
Try also ME 4.7R1 cracked ( because is using the same patch/crack and I belive that Yanislav the developer of Multiecuscan knows how to "close this kind of doors"
Good luck