Denso 4D56 Service Manual page 10

(1) Sensors
• Detect the engine and driving conditions, and convert them into electrical signals.
(2) Engine ECU
• Performs calculations based on the electrical signals received from the sensors, and sends them to the actuators in order to achieve
optimal conditions.
(3) Actuators
• Operate in accordance with electrical signals received from the ECU. Injection system control is undertaken by electronically control-
ling the actuators. The injection quantity and timing are determined by controlling the duration and timing in which current is applied
to the TWV (Two-Way Valve) in the injector. Injection pressure is determined by controlling the SCV (Suction Control Valve) in the
supply pump.
Sensor
Crankshaft Position Sensor (NE)
Cylider Recognition Sensor (TDC)
Accelerator Position Sensor
Other Sensors and Switches
Engine Speed
Cylinder
Recognition
Engine
ECU
Load
Operation Section
Actuator
Injector
•Injection Quantity Control
•Injection Timing Control
Supply Pump (SCV)
•Fuel Pressure Control
EGR, Air Intake Control Relay, Light
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Q001227E