Protege L4-1839cc 1.8L DOHC (1990)
Fuel Pressure Control Solenoid: Description and Operation
Pressure Regulator Control System
The Pressure Regulator Control Solenoid Valve, attached to the top right side of the intake manifold, is an ECU controlled component of the pressure
regulator control (PRC) system.
The PRC system raises fuel pressure to prevent fuel percolation during hot engine restart. Under specified conditions, the ECU closes the solenoid valve
to block vacuum to the fuel pressure regulator. This allows the pressure regulator to control fuel pressure without vacuum modulation. Fuel pressure is
raised to slightly more than 284 kPa (41 psi).
Under the following conditions, the ECU activates the PRC system for approximately 60 seconds after starting:
1.
Coolant temperature above 90°C (194°F).
2.
Intake air temperature above 58°C (136°F).
3.
Throttle valve fully closed.
