This video corrects the step motor circuit failure (P1777) AND the resulting P1778 - Step motor mechanical function which results IF you set the primary pulley pressure lever in the wrong position. Do it the right way and you can fix this in an afternoon. Do it the wrong way and...well, watch the video and see.
The step motors are readily available here:
https://www.amazon.com/s?k=nissan+ste...

https://www.ebay.com/sch/i.html?_from...