9.9 ohms means the coil appears to be open. I always keep a regular cartomizer around filled with juice. If I have a problem with a device, I slip that on & retry to vape. If that vapes good, the problem is the coil. If it doesn't work either, I try the carto on another battery. If it works on the 2nd battery, I put the original carto/atty/vivi on the 2nd battery. If it works, there is a problem with the original battery. If it doesn't the carto/atty/viwi, etc is bad. It's called double substitution troubleshooting.
Now, I've had both carto's work on the different battery, but not on the original. I'm kinda having that problem now. I think one of my batteries has the center pin pushed down to far. I just haven't tried to pull it up 'cause I've got a coil working on both of my units. I don't wanna break something right now.