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The structure and operation is basically the same as that of 4B10 engine. Refer to GROUP
13B - Multipoint Fuel Injection (MPI) - Sensor  .
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A throttle valve control servo is installed in throttle body. The throttle valve control
servo performs the Open/Close of the throttle valve through the reduction gear. Engine-ECU changes current
direction according to the Open/Close direction and also changes current to the motor coil to
control the throttle valve control servo.
Throttle valve control servo is composed of a good response, low energy, and small DC
motor with brush and can generate rotation force corresponding to the current applied on the
coil. When there is no current passing through the throttle valve control servo, the throttle
valve remains at a prescribed opening angle. So, even if current stops because of a fault in the
system, a minimum level of running remains possible.
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Refer to GROUP 16 - Ignition System - Ignition Coil .
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Refer to GROUP 17 - Emission Control - Evaporative Emission Control
System .
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The wastegate solenoid valve, which is installed to the air cleaner assembly, controls
the amount of leakage of the supercharging pressure that is introduced into the waste gate actuator.
The waste gate solenoid valve is a duty control type solenoid valve. When current is not passing
through the coil, nipple A is kept airtight. When current passes through the coil, air can pass
between nipple A and B. Engine-ECU changes the ON duty ratio to control the amount of leakage
of the supercharging pressure.
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The structure and operation is basically the same as that of 4B10 engine. Refer to GROUP
13B - Multipoint Fuel Injection (MPI) - Sensor .
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The structure and operation is basically the same as that of 4B10 engine. Refer to GROUP
13B - Multipoint Fuel Injection (MPI) - Sensor .
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Engine-ECU uses ON/OFF of alternator G terminal to control alternator output voltage.
When the power transistor in the engine-ECU turns ON, output voltage gets adjusted to about 12.8
V. When alternator output voltage drops to 12.8 V it becomes lower than voltage of the charged
battery and almost no current is output from the alternator. When the power transistor in the
engine-ECU turns OFF, output voltage gets adjusted to about 14.4 V. When alternator output voltage
is about 14.4 V, alternator outputs current to produce electricity. In case electric load is
generated suddenly, engine-ECU controls alternator G terminal’s On-duty to limit the
sudden increase in alternator load due to generation and thus prevents change in idle speed.
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