The basics of how Yamaha implemented EFI on many models. There is some new information for some and for others these videos support what we have learned over the years...
Yamaha EFI
Yamaha EFI
Yamaha fuel injector testing
Yamaha fuel injector testing
Thank
over on 600cc.org for...
Take a look, a link with the basics on how to use a hand held multimeter. Sometimes referred to as a DMM or DVM.
Measuring:
Volts, ohms, current (amps)....
Using Multimeters Part 1
Using Multimeters Part 2, (on your vehicle)...