I highly recommend to anyone who has'nt to purchase the shop manual to do so. They cost approx $50. Read, read, and re-read the section on fuel injection and the trouble shooting. If I understand correctly, a trouble code will show in the clock window. The code indicates what is generally wrong (rpm, crank sensor, etc). The codes are shown in the manual. You can also input a code to test a certain sensor or circuit. The manual says if you get code XX, input code YY and certain values will or should show up. Then you take this info to asertain what needs to be fixed. Once you fix the circuit, the code should self clear or you can manually clear it.One good thing is that if some critical sensor goes bad, the engine will not run. These would be the crank sensor, kickstand, or tip over. The book says that if other circuits mal-funtion, the ECU just inputs a safe general value. So the bike will run, but may not be running otimally. I will say in some ways I miss the old carb and mechanical timing that was soooo reliable!!! What I dont miss is hit and miss re-jetting multiple carbs!!