Today I got an evap code and first replaced gas cap...luckily it turned out to be that as the light had turned off after I replaced it....but on my code reader I noticed that it had said the fuel system'* are in a closed loop with fault is this right....does it mean it is goinginto closed loop but the computer is using a different way for air/fuel ratio....I have never got a trouble code for this but I noticed it in the freeze frame

that'* odd. Closed/open is usually reliant on the temp of the car. I'd take the easy way out and clear the code. Then look for it again. If it appears, we can help you diagnose it further.