WARNING: This page is about a different car, the 2014 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.
Attach timing light to loop wire as shown.
Fig 1: Attaching Timing Light To Loop Wire
Courtesy of NISSAN NORTH AMERICA, INC.
Check ignition timing.
Fig 2: Checking Ignition Timing Using Timing Indicator