Idle Air Control (Iac; Variable Air Duct (Vad) Control; Variable Tumble Control System (Vtcs - Mazda 6 Training Manual

1 Pulse wheel
2 CKP sensor
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IDLE AIR CONTROL (IAC)

Outline
• The IAC of the Mazda6 (GG) is essentially carried over from the current MPV (LW) FS engine models ecept
for the followings.
— Add the MAP factor to the feedback correction
— Target engine speed is different caused to match the vehicle characteristics.
Target Engine Speed
Condition
No load
1
Electrical load is on.*
P/S is operating.
2
A/C is operating.*
(Middle pressure switch OFF or Not equipped)
2
A/C is operating.*
(Middle pressure switch ON if equipped)
1
* : Headlight is on, fan switch is above 1st, cooling fan is operating, and rear window defroster is on.
2
* : A/C switch and fan switch are on.
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VARIABLE AIR DUCT (VAD) CONTROL

Outline
• The VAD control system opens the VAD shutter valve in the air cleaner only at high engine speeds so that
engine performance does not decrease at high engine speeds due to insufficient mass airflow amount.
Operation
• The PCM turns the VAD control solenoid valve ON to open the VAD shutter valve when all of the following
conditions have been met.
— ECT: above 70 ° ° ° ° C [158 ° ° ° ° F]
— Engine speed: above 5,800 rpm
— TP angle: above 50%
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VARIABLE INTAKE-AIR SYSTEM
Outline
• The VIS system of the Mazda6 (GG) is essentially carried over from the VICS of the current MPV (LW) FS
engine models ecept for operation conditions.
Operation Conditions
• The PCM energized/de-energized the VIS solenoid valve at the engine speed of appro 4,400 rpm.
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VARIABLE TUMBLE CONTROL SYSTEM (VTCS)

Outline
• The VTCS actuates the VTCS shutter valve in the intake manifold to increase the intake air flowing speed and
create the tumbling air in the combustion chamber for better injected fuel atomization, thus reduces the HC and
CO ehaust emissions at light load.
CONTROL SYSTEM
3 Crankshaft angle
4 CKP sensor output signal
L8
700
700
750
750
750
Idle speed (rpm)
LF MTX LF ATX
650 700
700 700
700 700
750 700
750 750
A6E394018881T07
F
L3
650
700
700
750
750
A6E394018881T08
A6E394018881T09
A6E394018881T10
F–35