Line Pressure Solenoid Valve
WARNING: This page is about a different car, the 2002 Infiniti QX4, 2001 Nissan Pathfinder, and 2001 Infiniti QX4. However, it is still accessible from the selected car via links, so may be relevant.
Line pressure solenoid valve regulates oil pump discharge pressure to suit driving condition in response to signal sent from TCM.