High Fuel Pressure Control
WARNING: This page is about a different car, the 2017 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
The high pressure fuel pump raises the pressure of the fuel sent from the low pressure fuel pump. Actuated by the exhaust camshaft, the high pressure fuel pump activates the high pressure fuel pump solenoid based on a signal received from ECM, and adjusts the amount of discharge by changing the timing of closing the inlet check valve to control fuel rail pressure.