Tb42e ECU

Hi all,

First post so go easy,

I have a tb42e, recently drowned the ecu and have been having a world of problems since. I’ve got another ecu and have put it in, I’ve also put In another MAF sensor. The problem I’m having is it’s running very rich. The MAF voltage from the signal to the ecu is constantly 5.4 Volts car running or not running. I’ve got Nissan consult so i can view all parameters, everything else seems pretty normal. Is it possible the new (secondhand) ecu I have is dead aswell.
Any advice would be great
Cheers