13E-12
2. Electronic Control System
2.1 System block diagram
Electronic control unit main power relay
Injector magnetic valve
supply pump
(SCV: suction control valve)
Fuel injection control
Input signals
Engine electronic control unit
Output signals
Engine
Engine speed sensor
Cylinder recognition sensor
Water temperature sensor
Boost pressure sensor
Common rail pressure sensor
Fuel temperature sensor
Intake air temperature sensor
Vehicle
Starter switch
Accelerator pedal position
sensor
Accelerator pedal switch
Vehicle speed sensor
Fuel injection rate adjustment
resistor
Memory clear switch (Connec-
tor)
Diagnostic switch (Connector)
Multi-Use Tester connector
Transmission neutral switch
Warm-up acceleration function
Exhaust gas recirculation valve
control function (See Gr17.)
Fault diagnostic function
Starter continuous energization
prevention function (See Gr54.)
Pre-heat control function
(See Gr54.)
Fuel injection quantity control
Fuel injection timing control
Engine warning lamp
Tachometer
Glow drive relay
Safety relay
Exhaust gas recirculation solenoid
valve
Glow plugs
CAN communication
Truck VCM and other
controls
CAN: Controller Area Network
Fuel injection pressure control
STRUCTURE AND OPERATION
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