Mazda 2009 RX-8, Service Highlights

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INTAKE-AIR SYSTEM [13B-MSP]
01-13–10
2009 Mazda RX-8 Serv i ce H i ghl i ghts (3452–1U–08C)
Rev i sed 11/2008 (Ref . No . R321/08)
VARIABLE FRESH AIR DUCT (VFAD) SOLENOID VALVE FUNCTION [13B-MSP]
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W i th VFAD
x
Sw i tches pressure ( i ntake man i fold vacuum or BARO) appl i ed to the VFAD actuator accord i ng to a s i gnal from
the PCM .
End Of S i e
VARIABLE FRESH AIR DUCT (VFAD) SOLENOID VALVE CONSTRUCTION/OPERATION [13B-MSP]
id0113z3662600
W i th VFAD
x
Composed of a soleno i d co i l, spr i ng, plunger, and f i lter .
Energ i zed
x
When the soleno i d co i l i s energ i zed, the plunger i s pulled back . Pull i ng the plunger back opens the passage
between ports A and B . Due to th i s, BARO i s appl i ed to the actuator .
De-energ i zed
x
Passage of port A i s closed by the react i on
force of the spr i ng, and the passage between
ports B and C i s opened . Due to th i s, i ntake
man i fold vacuum i s appl i ed to the actuator .
End Of S i e
SOKYU_NG : VARIABLE FRESH AIR DUCT ACTUATOR
VARIABLE FRESH AIR DUCT (VFAD) ACTUATOR FUNCTION [13B-MSP]
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W i th VFAD
x
Opens and closes the VFAD valve .
End Of S i e
VARIABLE FRESH AIR DUCT (VFAD) ACTUATOR CONSTRUCTION/OPERATION [13B-MSP]
id0113z3663400
W i th VFAD
x
A d i aphragm des i gn has been adopted .
x
Normally, the rod i s pushed by the force of the
spr i ng, open i ng the VFAD valve . When i ntake
man i fold vacuum i s appl i ed to the d i aphragm
chamber, the rod i s pulled, clos i ng the VFAD
valve .
End Of S i e
SOKYU_NG : AUXILIARY PORT VALVE MOTOR
AUXILIARY PORT VALVE (APV) MOTOR FUNCTION [13B-MSP]
id0113z3663100
x
Dr i ves the APV motor to open or close the APV accord i ng to a s i gnal from the PCM .
End Of S i e
AUXILIARY PORT VALVE (APV) MOTOR CONSTRUCTION/OPERATION [13B-MSP]
id0113z3663200
x
The pos i t i on sensor i s bu i lt i nto the APV motor .
x
The motor i s dr i ven accord i ng to an operat i on
s i gnal from the PCM .
x
The motor dr i v i ng force i s transm i tted to the dr i ve
gear, counter gear, shaft, and arm, thereby
open i ng or clos i ng the APV .
End Of S i e
B
C
A
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RETURN
(OPEN)
PULL
(CLOSE)
VFAD VALVE
VFAD
ACTUATOR
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APV
OPEN
CLOSE
COUNTER GEAR
APV MOTOR
DRIVE GEAR
SHAFT
ARM
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