WARNING: This page is about a different car, the 2011 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Mechanical & Other System Symptom Chart (1 Of 2)
Courtesy of NISSAN NORTH AMERICA, INC.
Fig 2: Engine Mechanical & Other System Symptom Chart (2 Of 2)