Operation Section
1
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6
1.7 Common Rail System Configuration
z The common rail control system can be broadly divided into the following four areas: sensors, engine ECU, EDU, and
actuators.
Sensors
z Detect the condition of the engine and the pump.
Engine ECU
z Receives signals from the sensors, calculates the proper injection quantity and injection timing for optimal engine oper-
ation, and sends the appropriate signals to the actuators.
EDU
z Enables the injectors to be actuated at high speeds. There are also types with charge circuits within the ECU that serve
the same role as the EDU. In this case, there is no EDU.
Actuators
z Operate to provide optimal injection quantity and injection timing in accordance with the signals received from the en-
gine ECU.
Engine Speed Sensor /
TDC (G) Sensor
Accelerator Position Sensor
Other Sensors
and Switches
Engine ECU
EDU
Supply Pump
(SCV: Suction Control Valve)
Injector
Other Actuators
Diagnosis
Q000754E
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