FUEL PRESSURE CONTROL
Normally, the negative pressure in the intake manifold acts upon the fuel pressure regulator
to maintain the fuel pressure at a constant level with regard to the pressure inside the intake
manifold, causing the amount of fuel injected to be controlled proportion to the injector drive
time. However, if the engine is started while the engine coolant temperature and the intake
air temperature are high, the engine-ECU makes current flow to the fuel pressure control solenoid
valve to activate the fuel pressure regulator by means of atmospheric pressure. Because of this,
the generation of fuel vapour due to the high fuel pressure and high temperature is avoided,
and the idling stability immediately after restarting the engine at high temperature is maintained.
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