Operation Section
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(4) Pressure Discharge Valve
• The pressure discharge valve controls the fuel pressure in the rail. When rail fuel pressure exceeds the target injection
pressure, or when the engine ECU judges that rail fuel pressure exceeds the target value, the pressure discharge
valve solenoid coil is energized. This opens the pressure discharge valve passage, allowing fuel to leak back to the
fuel tank, and reducing rail fuel pressure to the target pressure.
Q000861E
Pressure Discharge Valve
Rail
ON
ECU
To Fuel tank
Operating
Solenoid Coil
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