Mazda RX-8 2004 - Auxiliary Port Valve (Apv) Motor Construction;Operation (13 B-Msp (High Power)); Auxiliary Port Valve (Apv) Motor Function (13 B-Msp (High Power)); Check Valve Function; Variable Dynamic Effect Intake-Air (VDI) Actuator Construction;Operation

INTAKE-AIR SYSTEM
01–13–14
VARIABLE DYNAMIC EFFECT INTAKE-AIR (VDI) ACTUATOR CONSTRUCTION/OPERATION
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• A diaphragm design has been adopted.
• Normally, the rod is pushed by the force of the
spring, closing the VDI valve. When intake
manifold vacuum is applied to the diaphragm
chamber, the rod is pulled, opening the VDI valve.
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AUXILIARY PORT VALVE (APV) MOTOR FUNCTION (13B-MSP (HIGH POWER))
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• Drives the APV motor to open or close the APV according to a signal from the PCM.
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AUXILIARY PORT VALVE (APV) MOTOR CONSTRUCTION/OPERATION (13B-MSP (HIGH POWER))
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• The position sensor is built into the APV motor.
• The motor is driven according to an operation signal from the PCM.
• The motor driving force is transmitted to the drive
gear, counter gear, shaft, and arm, thereby
opening or closing the APV.
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CHECK VALVE FUNCTION
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• A one-way check valve has been adopted, allowing intake manifold vacuum to be applied to the vacuum
chamber.
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OPEN
CLOSE
PUSH
BAROMETRIC
PRESSURE
VACUUM
PULL
VDI ACTUATOR
VDI VALVE
(ILLUSTRATION SHOWS 13B-MSP (HIGH POWER))
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APV
OPEN
CLOSE
DRIVE GEAR
COUNTER GEAR
SHAFT
ARM
APV MOTOR
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