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

CONTROL SYSTEM
F35
F
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IDLE AIR CONTROL (IAC)
A6E394018881T07
Outline
• The IAC of the Mazda6 (GG) is essentially carried over from the current MPV (LW) FS engine models except
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
*
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
A6E394018881T08
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
A6E394018881T09
Outline
• The VIS system of the Mazda6 (GG) is essentially carried over from the VICS of the current MPV (LW) FS
engine models except for operation conditions.
Operation Conditions
• The PCM energized/de-energized the VIS solenoid valve at the engine speed of approx 4,400 rpm.
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VARIABLE TUMBLE CONTROL SYSTEM (VTCS)
A6E394018881T10
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 exhaust emissions at light load.
1 Pulse wheel
2 CKP sensor
3 Crankshaft angle
4 CKP sensor output signal
Condition
Idle speed (rpm)
L8 LF MTX LF ATX L3
No load 700 650 700 650
Electrical load is on.*
1
700 700 700 700
P/S is operating. 750 700 700 700
A/C is operating.*
2
(Middle pressure switch OFF or Not equipped)
750 750 700 750
A/C is operating.*
2
(Middle pressure switch ON if equipped)
750 750 750 750