Operation Section
1
–
15
PCV: Pump Control Valve
• The PCV (Pump Control Valve) regulates the fuel discharge quantity from the supply pump in order to regulate the
rail pressure. The fuel quantity discharged from the supply pump to the rail is determined by the timing with which the
current is applied to the PCV.
Actuation Circuit
- The diagram below shows the actuation circuit of the PCV. The ignition switch turns the PCV relay ON and OFF to
apply current to the PCV. The ECU handles ON/OFF control of the PCV. Based on the signals from each sensor,
it determines the target discharge quantity required to provide optimum rail pressure and controls the ON/OFF tim-
ing for the PCV to achieve this target discharge quantity.
Pumping Mechanism
• The camshaft is actuated by the engine and the cam actuates the plunger via the tappet to pump the fuel sent by the
feed pump. The PCV controls the discharge quantity. The fuel is pumped from the feed pump to the cylinder, and then
to the delivery valve.
PCV
Ignition Switch
+B
PCV Relay
PCV1
PCV2
From PCV relay
To Rail
Q000772E
Q000773E
Camshaft
Feed Pump
PCV (Pump Control Valve)
Pulsar for TDC (G) Sensor
Delivery Valve
Cam (3 Lobes: 6-Cylinders)
Plunger
To Rail
To Next Page
Loading...
