ECU: Engine Control Unit. It regulates all the aspects related to the engine's proper functioning.
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Engine Control Unit. According to the values shown by different sensors, it estimates certain parameters such as the amount of air and fuel that need to be supplied, the amount of time needed to start the car, the pressure of the turbocharger, and any other key aspects to maximize its performance and efficiency with the least amount of contamination possible.
Despite re sealing the HP pump ( 6000 psi when cranking), cleaning the gr valve, the particulate filter and the intake butterfly system. Changing the fuel filter, the common rail pressure control valve, the fuel flow regulator, the crank shaft sensor, used but good fuel injectors, and a complete ECU and matching parts, it is no different. My reader shows no fault codes, not do other "expert" mechanics equipment.
Will update