Rover Streetwise - drop of power

Hello all, a friend in the workshop ? got a Rover Streetwise (2.0 TD which should have a EDC15) that has practically no strength. The minimum ? regular, part very well and acceleration to insane, it seems all ok, while trying out the cars on the road you notice a lack dramatic force.
With the KTS ? managed to get in the diagnosis and cos? I tried with the Autocom. Entering with the generic protocol, OBD I log in but there are no errors ( the light on the picture ? off). It happened to me already? someone a similar problem ?
The decline in performance ( steep) ? happened from one day to the other, for? for how to adjust the car to me it would seem strange to a mechanical failure

try to see or measure the mass air flow sensor, check to see if the turbine enters or not, maybe you have leaks in the intake system . according to me, nn, and a problem of the ecu and stuff similar I + sensors . good job.

the mass air flow sensor works and the turbo as well.
I would like to exclude a problem of high-pressure pump. The strange thing ? who doesn't ? reported no damage.