I bought a 2006 sportsman 500 efi last november and have used it plowing my driveway, the plow was put on after I bougnt it. it has 400 miles on it, everything has been working fine until the last time it snowed. About half way through plowing the "check engine" light came on for a little while, then went out. It came on again before I was done plowing, and went out before I put it in the garage. Today I tried to do a diagnostic check. I turned the ignition on like the manual said to do, and the check engine icon was on then, The manual says that the word "WAIT" will appear on the screen, it didn't. I tried again, turning the key on and off 3 times in less than 5 seconds, and would again no WAIT word. I'm following the instructions in the 2006 Sportman 500 EFI owners manual addendum p/n 9920595. Any idea what it could be? Thanks