Checking the fuses is only one part of the troubleshooting flow chart for code 46. There are two tests that can be done with a dealer's diagnostic test equipment and a voltage test that can be done with a decent VOM. That would be checking for battery voltage at ECM connector 2, pin 1. Test with tractor off; key on. Hopefully you are checking the fuses with a VOM or at least a test light. A visual test is not adequate, as I have been burned by fuses that looked intact but would not pass current. My bet is your ECM is toast, but that should be verified prior to replacement.