Wow, OK I know how to deal with that. Get a spark plug tester. I have a coil on plug in my boat. So I use a spark tester with a sealed cylinder to check it. DormanŽ 86579 - In-Line Spark Checker
I use that on my boat.
I don't think I would be able to use that correctly. The Coil pack for these newer Aveos are 1 piece. So if I need to test #3 for sure with that tool, all 4 would be disconnected. Though, I may end up purchasing that for later use