Oil Jet Relief Valve

WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

Using a clean plastic stick, press check valve in oil jet relief valve. Make sure that valve moves smoothly with proper reaction force.
If it is not satisfied, replace oil jet relief valve.

Fig 1: Checking Oil Jet Relief Valve

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