It's 1-2, 2-3, 4-5, 5-6. I used to test these things all day long. Now, if I receive an aluminum ISC, I just throw it in a box. I don't even bother anymore, they are all worthless IMO. Testing the coils is only half the battle. Plus, you are testing when it cold... there is no guarantee it works when it's warm.Thanks for the clarification on the measurement. I will grab a spare one I have, do some measuring and edit the original post as needed to clarify. I believe I took my info from the manual.
It drives me nuts when people want to skimp on something like this. 80% of the aluminum ISC I receive are bad. I seriously have a large flat rate box FULL of them. So statistically speaking it's not a matter of "if" but "when". And a failing ISC can take out your ECU, if not dealt with in a timely manner. So quit being cheap (not pointing out anybody in particular BTW) and buy a new aftermarket or OEM ISC.
Aftermarket ISC part number is AC99 (you can find these for $50 shipped)
OEM ISC can be bought here: http://www.dsmisc.com/dsmweb-dw/index.html
The coils on the ISC below tested within specs. Then I decided to open it up.