change of tension in ECU DE MOTOR IVECO 10.3

Estimated mechanics and associates, I have the following problem, I have a cane harvester with Iveco Motor 10.3 Lts Cursor 10, the engine was damaged and for repair cost Food 12 or 24 volts, for me it is almost clear that every PLC or CCU has a vote rectifier with an important range of variation, but, I am not sure, if someone can give me a clue, it is appreciated.

Thank you.

Friend if the control unit comes with the new 12 volt engine then it is twelve volts if you were 24 then 24 I think.