Fuel Pressure Regulator Control System

Fig. 43 Fuel Pressure Regulator Control System:

CIRCUIT OPERATION
During hot engine starting the ECU will supply the ground circuit to the fuel pressure regulator control valve. The solenoid valve opens the vacuum line to the surge tank allowing high pressure that has been stored in the tank (from turbo operation) to enter the line. This increases the fuel pressure, allowing easier starting.

Fig. 142 Vacuum Control Solenoid:

PRESSURE REGULATOR CONTROL SOLENOID
When the ECU senses conditions necessary for increased fuel pressure, it energizes the solenoid, redirecting air from the source port and vent port to the source port and valve port. This allows air from the surge tank to act upon the pressure regulator, increasing fuel pressure.

Fig. 54 Fuel Temperature Sensor And Pressure Regulator:

PRESSURE REGULATOR
The fuel pressure regulator maintains the fuel pressure at 206 kPa (2.1 kg/cm2, 30 psi) at idle. It utilizes vacuum acting upon a diaphragm to control the amount of fuel pressure allowed to the injectors.

Fig. 42 Fuel Pressure Regulator Operation:

Refer to the chart for fuel pressure regulator operation.