Fuel Pressure Regulator Control System

Fig. 13 Fuel Pressure Regulator Control:

CIRCUIT OPERATION
During hot engine starting the ECU will supply the ground circuit to the fuel pressure regulator control solenoid. The solenoid valve opens the vacuum source to the pressure regulator allowing atmospheric pressure enter the line. This increases the fuel pressure, allowing easier starting.

Fig. 30 Solenoid Valve:

PRESSURE REGULATOR CONTROL SOLENOID
The pressure regulator control solenoid allows vacuum to be applied to the fuel pressure regulator. The ECU completes the ground circuit allowing battery voltage to operate the solenoid.

Fig. 31 Fuel Pressure Regulator:

PRESSURE REGULATOR
The fuel pressure regulator maintains the fuel pressure at 299.1 kPa (3.05 kg/cm2, 43.4 psi). It utilizes vacuum acting upon a diaphragm to control the amount of fuel pressure allowed to the injectors.

Fig. 14 Fuel "Pressure-Up" Operation:

Refer to the chart for fuel pressure regulator operation.