Throttle Body Function; Throttle Body Construction/Operation; Construction; Operation - Mazda RX-8 2004 Service Highlights

THROTTLE BODY FUNCTION

• An electronic throttle valve has been adopted
which opens and closes the throttle valve with the
actuator according to a signal from the PCM. It
enables precise intake air control at all engine
speed ranges.
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THROTTLE BODY CONSTRUCTION/OPERATION

Construction

• The throttle body construction is as shown in the
figure.

Operation

• The actuator is driven by a duty signal from the PCM. This driving force is transmitted to the actuator gear,
middle gear, and valve gear, and the throttle valve opens.
• Conversely, to close the throttle valve, the actuator is reversed by an opposite signal from the PCM, and the
throttle valve closes.
• The throttle valve opening angle is input to the PCM by the TP sensor.
• The throttle valve body has a control spring. If a malfunction occurs and the actuator cannot be controlled, the
throttle valve is maintained balanced at an opening angle of 5° by the spring. Due to this, the required amount
of air for vehicle operation is ensured.
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INTAKE MANIFOLD FUNCTION

• Integrates the SSV, VDI valve, and APV (13B-MSP (High Power)) which are switched according to the engine
speed and fuel amount required by the engine. Due to this, torque and output in all driving ranges are
improved.
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01–13–6
INTAKE-AIR SYSTEM
ACTUATOR
ACTUATOR GEAR
MIDDLE GEAR
VALVE GEAR
THROTTLE POSITION
SENSOR
ACTUATOR
THROTTLE BODY
THROTTLE VALVE
SPRING
CHU011313640S01
CHU0113S007
CHU011313640S02
THROTTLE BODY
THROTTLE
VALVE
CHU0113S008
CHU011313100S01