ecu electical problem

I would like to know if I can take a computer from the same year and model machine and swap it to my machine to see if it will start. My machine will not start and I have checked just about everything. Here is my story below which is why I want to swap a computer with another machine. Thanks...

My 2008 Sportsman 500 EFI is turning over and has a good battery, but no fuel is getting to the engine. I'm only getting 5 volts at the Fuel Pump?? Also, as soon as I turn the key the Fan starts running and never turns off. I have googled the problem and it sounds to me like it could be a bad...