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Yeah thats all I find too. It ran fine for 4hrs now it runs rough and engine shakes at idle. Lost 1000Rpm also. I was hoping a 02 since I fog the engines. 4star engine.
I had this code on my first trip out but mine ran fine. I tried all the reset things also with out success. I finally cleared it while trying to connect a can doo to read the codes because there wasn’t one one the screen. The directions said to disconnect port tach which was wrong for a 17. But while trying to do so and powering on the key the a few times the code cleared and I haven’t had it come back. If you’re idling rough I would suspect a spark plug or coil. I’ve since changed my plugs which I do every year and still no repeat.
Update on this finally! I have been having issues for a while and too stubborn to take in. Not sure someone would have been totally honest and not a parts changer. I have been a mechanic/service tech for 25yrs and have never seen clean cut wires inside insulation(seen a lot of wire issues). I think possibly the crimp tool Yamaha used cracked the wires and they finally gave.
Please note this was an intermittent no spark that caused the 231 ignition code.