Mazda 6. Manual — part 19
F–12
OUTLINE
.
A6E3940T904
OUTLINE, INTAKE-AIR SYSTEM
F–13
F
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INTAKE-AIR SYSTEM OUTLINE
A6E391013000T01
•
The function, structure and operation of each part in the intake-air system of the Mazda6 (GG) L3, LF, and L8
engine models are essentially carried over from the current 323 (BJ) FS engine models, except for the
following:
— A non AAS type throttle body has been adopted to improved serviceability.
— A resin intake manifold has been adopted to reduce weight.
— The variable air duct (VAD) system has been adopted to improved the engine performance.
— Variable intake-air system (VIS) has been adopted. Same function as VICS of current 323 (BJ) FS engine
models.
×
: Applied
–: Not applied
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31
Generator
32
Refrigerant pressure switch (middle)
33
PSP switch
34
Blower motor
35
Refrigerant pressure switch (high and low)
36
A/C switch
37
Brake switch
38
Brake light
39
Neutral switch
40
Clutch switch
41
TR switch
42
Input/turbine speed sensor
43
HOLD switch
44
TFT sensor
45
Oil pressure switch
46
VSS
47
Ignition coil
48
Generator
49
Purge solenoid valve
50
VAD control solenoid valve
51
EGR valve
52
Variable tumble control solenoid valve
53
VIS control solenoid valve
54
OCV
55
Valve body
56
L8, LF (Intensely hot area) and L3 engine models
57
MTX model
58
ATX model
59
L3 engine model
INTAKE-AIR SYSTEM
Item
Mazda6 (GG)
Current 323
(BJ) FS
Remark for new model
L3
LF
L8
Resonance chamber
×
Same function as current 323 (BJ) FS
engine models
Air cleaner
×
Same function as current 323 (BJ) FS
engine models
Throttle body
×
Same function as current 323 (BJ) FS
engine models
AAS has been eliminated due to
automatic adjustment of idle speed
IAC valve
×
Same function as current 323 (BJ) FS
engine models
Intake manifold
×
Same function as current 323 (BJ) FS
engine models
Dynamic chamber
×
Same function as current 323 (BJ) FS
engine models
VIS
×
–
×
Same function as VICS of current 323
(BJ) FS engine models
VTCS
×
–
Same function as current MX-5 (NB)
BP engine models
VAD system
×
–
Newly adopted
F–14
INTAKE-AIR SYSTEM
INTAKE-AIR SYSTEM STRUCTURAL VIEW
A6E391013000T02
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VARIABLE AIR DUCT (VAD) SYSTEM OUTLINE (L3)
A6E391013000T03
Outline
•
The VAD control system opens the VAD shutter valve in the air cleaner only at high engine speeds not
decrease at high engine speeds due to insufficient mass airflow amount.
Structure
•
The VAD system is composed of VAD shutter valve, VAD control solenoid valve, VAD vacuum chamber, VAD
check valve (one-way).
A6E3910W036
1
Air cleaner
2
IAC valve
3
Resonance chamber
4
VIS control solenoid valve (L3)
5
Variable tumble control solenoid valve
6
L8, LF engine models
7
Intake manifold
8
VIS shutter valve actuator (L3)
9
VTCS shutter valve actuator
10
VAD check valve (one-way) (L3)
11
Accelerator pedal (R.H.D.)
12
Accelerator cable (R.H.D.)
13
Accelerator pedal (L.H.D.)
14
Accelerator cable (L.H.D.)
15
VAD shutter valve (L3)
16
VAD control solenoid valve (L3)
INTAKE-AIR SYSTEM
F–15
F
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VARIABLE AIR DUCT (VAD) SHUTTER VALVE DESCRIPTION (L3)
A6E391013000T04
Function
•
Opens and closes the shutter valves.
Structure
•
The VAD shutter valve actuator is composed of a rod, diaphragm chamber, and spring.
Operation
•
Normally, the rod is pushed by the force of the spring, opening the shutter valve. When intake manifold vacuum
is applied to the diaphragm chamber, the rod is pulled, closing the shutter valve.
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A6E3910W029
1
VAD shutter valve
2
VAD control solenoid valve
3
VAD vacuum chamber
4
VAD check valve (one-way)
A6E3910W027
1
Shutter valve open
2
Shutter valve close
3
VAD shutter valve actuator
4
Rod
5
VAD shutter valve
6
Intake manifold vacuum
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