P and N Positions

WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

P position
Similar to the N position, the clutches do not operate. The parking pawl engages with the parking gear to mechanically hold the output shaft so that the powertrain is locked.
N position

Power from the input shaft is not transmitted to the output shaft because the clutches do not operate.

Fig 1: Automatic Transaxle System Power Transmission Diagram (N And P Positions)

Courtesy of NISSAN MOTOR CO., U.S.A.