Jeep 1.4 turbo issue

[Jonnybravo]

Hi, Im after a bit of help understanding a problem with turbo pressure on a jeep Renagade 1.4ma turbo, the same as fiat 500 and Mitos etc.
Its very flat, and when looked at with my multiscan when being driven it shows the actual and desired turbo pressure to be maximum 1200mbar. Am I right in thinking that the desired pressure is what the car ecu is calling for.? ie something is stopping the car from calling for any turbo pressure.? and because both are around the same no fault code is created.?
Also momentarily when we were out, both the actual and desired pressure went to around 2000mbar and the car drove as it should which is making me think that there is a fault which is stopping the ecu from calling for turbo pressure.
I have checked the turbo and it spins freely with no play or noises.
Thanks for any help