I just got a P0443 and a P0481 after installing a nitrous kit. I also installed a switch inline with the fan relay to manually control the fan. So that is what the P0481 is from. I took the wires going to the realy and am still getting the code after I reset it. One of the 30 amp maxifuses was blown and has been replaced. The P0443 is for the EVAP purge solenoid. How do I go about troubleshooting this? The purge solenoid is getting 12 volts at the plug. Any ideas for these?

P0481-Cooling Fan 2 Control Circuit

P0443-EVAP System Purge Control Valve Circuit Malfunction

The car is a 2001 Corvette.