Method A

WARNING: This page is about a different car, the 2005 Nissan Xterra. 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 MOTOR CO., U.S.A.
Check ignition timing.

Fig 2: Identifying Ignition Timing
Courtesy of NISSAN MOTOR CO., U.S.A.