Method A

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WARNING: This page is about a different car, the 2006 Nissan Pathfinder. 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 Wires
Courtesy of NISSAN MOTOR CO., U.S.A.
Check ignition timing.

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