How does the Throttle body communicate with a CVT gearbox

I am still trying to find out the solution to the my CVT gearbox light issue (flash code 6), I have noticed now that the revs are hunting badly up and down etc.
I am trying to rule out if the TB sensors could be giving wrong signals and this is throwing out the CVT? I have additionally noticed that when you go into N the rev raise significantly.

If I can't fix the issue then the car will have to go. :(
 
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