Going way back to the GM mil fault codes on my 1985 Pont....Grounding two pins initiates the blink codes. My 1991 Nissan has a little (cigar box sized) ECU with a plastic screw on the back which is turned one way to initiate the fault blink codes. Maybe something simple on the CC connector if you can find it?
Well... I'm not inclined to go so far as unplugging anything, with my luck I'd break off a little interlock tab or something - or who knows what. I'll wait and see but I bet that hour meter would read out the codes. Nothing could be easier, quicker, or CHEAPER for CC than to just press a button and get any codes that exist on the LCD window.
I also have a Harley Sportster, bought used but I made sure that I got one which had fuel injection on it. On the HD forums a lot of the guys are scared of the EFI system, they'd say they'd rather take apart their own carburetor and tune the engine, and so forth. But really, I don't feel the need to 'tune' my bike any further. And after having a number of motorcycles over the years and fighting with them to get them started every spring, to press the button and have the engine fire and start on the first compression stroke is SO much better.
The CC doesn't have a crank sensor so it doesn't start up quite that instantly, but it does start on probably the 3rd compression stroke like clockwork, and stays running no matter where I have the throttle set.