My Service Engine Soon (SES) Light came on the other day while I was climbing a long hill on the interstate at about 75 mph in my 2006 XTERRA SE. After I got home, I followed the procedure in the Nissan service manual to read the DTC codes without a diagnostic tool. After following the procedure, I got 7 slow flashes on the SES light, followed by a pause, then a quick single flash, which by the manual should be code 71. I repeated the procedure from the service manual seveal times and got the same series of flashes each time. This doesn't seem to match any of the DTC codes in the Service Manual, as these are all 4 digit codes. Any clues as to what my XTERRA is trying to tell me? I am not having any problems or symptoms that would give me as to what the problem might be, as the vehicle is still running perfectly. Thanks for any help anyone might be able to provide!