Electrical problem

Hello good night, if you provide me with information in a Hiunday Tucson Diesel 2.0 in 2009 shows me in the Scaner under battery tension when opening to the Swicht load 12.2 volts when starting it falls to 8.4 If accelerate falls to 6.3 and the engine is covered, but battery load with multimeter brand 14.3 I already probate with another module and it happens the same and the one of my car is the same and the one of my car. Thanks for information.

Your Poblema is in the mass of the control unit that is why the voltage falls and sees you to make that fault controls the mass of chassis and the engine first with a tester must measure 0 ohms greetings