Mazda RX-8 2004 - Variable Dynamic Effect Intake-Air (VDI) Actuator Function; Variable Dynamic Effect Intake-Air (VDI) Solenoid Valve Construction;Operation; Variable Dynamic Effect Intake-Air (VDI) Solenoid Valve Function; Variable Fresh Air Duct (Vfad) Actuator Construction;Operation (13 B-Msp (High Power))

INTAKE-AIR SYSTEM
01–13–13
01–13
VARIABLE FRESH AIR DUCT (VFAD) ACTUATOR CONSTRUCTION/OPERATION (13B-MSP (HIGH POWER))
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• A diaphragm design has been adopted.
• Normally, the rod is pushed by the force of the spring, opening the VFAD valve. When intake manifold vacuum
is applied to the diaphragm chamber, the rod is pulled, closing the VFAD valve.
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VARIABLE DYNAMIC EFFECT INTAKE-AIR (VDI) SOLENOID VALVE FUNCTION
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• Switches pressure (intake manifold vacuum or BARO) applied to the VDI actuator according to a signal from
the PCM.
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VARIABLE DYNAMIC EFFECT INTAKE-AIR (VDI) SOLENOID VALVE CONSTRUCTION/OPERATION
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• Composed of a solenoid coil, spring, plunger, and filter.
Energized
• When the solenoid coil is energized, the plunger is pulled back. Pulling the plunger back opens the
passage between ports A and B. Due to this, intake manifold vacuum is applied to the actuator.
De-energized
• Passage of port A is closed by the reaction force of the spring, and the passage between ports B and C is
opened. Due to this, BARO is applied to the actuator.
End Of Sie
VARIABLE DYNAMIC EFFECT INTAKE-AIR (VDI) ACTUATOR FUNCTION
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• Opens and closes the VDI valve.
End Of Sie
PULL
(CLOSE)
RETURN
(OPEN)
VFAD VALVE
VFAD ACTUATOR
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A
B
C
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