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Compact, power-saving type injectors that are controlled by solenoid valves have been
adopted. Unique ID codes, which identify the injection characteristics of each injector, are
assigned to the individual injectors. This enables the system to effect fuel injection amount
control based on the individual characteristics and ensure a highly accurate fuel injection
amount. The engine-ECU outputs signals to open and close the solenoid valves in order to control
the fuel injection timing and injection amount. In addition, pilot injection control, which
splits the injection of fuel into two stages, has been adopted.
An injector consists of a nozzle, command piston, command chamber, and solenoid valve
that controls the outflow orifice ON-OFF. The command piston moves up and down as it bears the
fuel pressure. The nozzle, which is integrated with the command piston, moves in the same manner
to open and close the fuel injection orifice of the injector.
A ID code (consisting of 30 alphanumeric characters) is stamped on the head of each injector,
representing the injection characteristics of the individual injector. The engine-ECU uses this
information to realize optimal injection amount control. When a new injector is used on a vehicle,
its ID code must be input into the system through the use of the M.U.T.-III.
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The throttle actuator control motor, which is built into the throttle body, opens or closes
the throttle valve via reduction gears. The engine-ECU switches the direction of the electrical
current, depending on whether to operate the motor in the opening or closing direction. It also
controls the PWM (Pulse Wide Modulation) and the throttle actuator control motor in order to modulate
the electrical current to the motor coil.
The throttle actuator control motor is a DC motor containing small brushes that offer
excellent response and power consumption performance. This enables the motor to output a rotational
power that is proportionate to the electrical current carrying capacity imprinted on the coil.
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Refer to GROUP 13B - Fuel Supply - Supply Pump  .
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Refer to GROUP 17 - Engine and Emission Control - Exhaust Gas Recirculation
(EGR) System .
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