@Italiandriver ,
From your post #17, above, you have a basic lack of understanding of your engine. The physical throttle that you have been looking at is part of the EGR system, and is in no way the equivalent of a petrol engine throttle. It does not directly control the power output of the engine, To put it simply, pressing the accelerator pedal instructs the ECU to inject more fuel, which increases the output.
In posts in #11 & #12 above, I suugested that the faulty connector problem was not relevant to the x244. In ignoring this, you have involved yourself in needless work.
You have reported a fault code indicating that throttle sensor is faulty, but that could includes the connectors at accelerator, and at the ECU, as well as connector D004A, which I have previously mentioned. I suggest that you check voltages at the accelerator pedal sensor by back probing the connector, with the system live. You could use special needle probes, or alternatively I have read of upholstery "T" pins being used. You have previously mentioned "currents" being checked. Perhaps this is a misnomer for voltages. What are the readings, and where were they taken?
Before you proceed further, the ECU has to be happy with the accelerator sensor inputs.
I am attaching the Fiat eLearn description for the 2.0jtd fuel system., which is a long file. Details of accelerator sensors are included towards the end.
Other possible causes of sudden power loss include, sticking clutch pedal switch, and problems with the turbo vacuum modulating valve, including vacuum hose connections. I cannot see that thes would cause an accelerator sensor fault code.
This information and much more, is available in eLearn for the x244, which runs on a Windows computer, and is available in the forum downloads section.