Hi iv a 2005 fait scudo i can not get a JTD engine only a HDI i was wondering will this engine run on the JTD wiring loom. Any info would be great, thanks

Yes the Fiat 2.0JTD is in fact a Peugeot/Citroen 2.0HDI engine.
If you get an HDI engine from a Scudo, Peugeot Expert or Citroen Dispatch/Jumpy of the same model, there should be no problem to swap the engine.
2.0HDI engines are also in the post 2007 model Scudo/Expert/Dispatch/Jumpy and in many other Peugeot and Citroen cars. It's possible that in those cases the wiring isn't the same as in a 2005 Scudo, so check that out before you start dismantling.

Thanks for that info, friend of mine has a Peugeot expert he put in a JTD and the van not starting now, i was thinking maybe the brains were different?

Have u tried code reader on it