Operation Section
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6.2 Engine ECU (Electronic Control Unit)
z The engine ECU constantly ascertains the status of the engine through signals from the sensors, calculates fuel injec-
tion quantities etc. appropriate to the conditions, actuates the actuators, and controls to keep the engine in an optimal
state. The injectors are actuated by either the EDU or the charge circuit in the engine ECU. This actuation circuit de-
pends on the specifications of the model it is mounted in. The ECU also has a diagnosis function for recording system
troubles.
6.3 EDU (Electronic Driving Unit)
(1) General Description
• An EDU is provided to enable high-speed actuation of the injectors. The EDU has a high-voltage generation device
(DC/DC converter) and supplies high voltage to the injectors to actuate the injectors at high speed.
Q000875E
Sensors Engine ECU Actuators
Cylinder Recognition Sensor
(TDC (G) Sensor)
Crankshaft Position Sensor
(Engine Speed Sensor)
Accelerator Position Sensor
Other Sensors
Engine ECU
Injector
Supply Pump
(PCV : HP0, SCV : HP2 · HP3 · HP4)
Other Actuators
Charge Circuit
(Built into ECU)
or
EDU
Actuation Circuit
ECU
EDU
Actuation Signal
Check Signal
Actuation Output
Q000876E
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