Hello my friend,
It looks like that for nissan and infiniti, if you want to make good diagnostics, you need the whole consult III hardware and software. There is the consult III or Consult III Plus available. The first one is about 250$ US and the PLus is over 2000$. It looks like the only difference between the two is the VI and the programming. I have the non-plus version and I can make many nice system validations. I just realigned the radar cruise with it (something that usually only the dealer can do.). I also have the engine link app on my ipad using a odbII wifi connector but it does not do a fraction of what can the consult III can do. Hope this helps!