Mazda 6. Manual - part 24

F–32

CONTROL SYSTEM 

CONTROL DEVICES AND CONTROL RELATIONSHIP CHART

A6E394018881T04

Engine Control System
Input devices

x: Applicable

Component

IAT sensor

x

x

x

x

x

x

x

×

MAF sensor

x

x

x

x

x

x

x

x

TP sensor

x

x

x

x

x

x

x

x

MAP sensor

x

x

ECT  sensor

x

x

x

x

x

x

x

x

x

x

x

CMP sensor

x

x

CKP  sensor

x

x

x

x

x

x

x

x

x

x

x

x

x

Knock sensor

x

Front HO2S

x

x

Rear HO2S

x

BARO sensor

x

Neutral switch

x

x

x

x

Clutch switch

x

x

x

x

x

TR switch

x

x

x

x

x

Brake switch

PSP switch

x

x

x

VSS

×

A/C switch, refrigerant 
pressure switch (high, 
low pressure)

x

x

x

×

×

Refrigerant pressure 
switch (middle pressure)

×

Battery voltage

x

x

x

×

Generator terminal P
(Generation voltage)

x

x

x

×

ABS/TCS HU/CM

×

Coil

×

CONTROL SYSTEM 

F–33

F

Output devices

×

: Applicable

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Component

IAC valve

×

VAD control solenoid valve

×

VIC solenoid valve

×

VTCS solenoid valve

×

Oil control valve (OCV)

×

Fuel injectors

×

×

Fuel pump relay

×

Ignition coil

×

×

Purge solenoid valve

×

EGR valve

×

HO2S heaters

×

×

A/C relay

×

Cooling fan relay

×

Generator (terminal D: field 
coil)

×

ABS/TCS HU/CM

×

F–34

CONTROL SYSTEM 

CAMSHAFT POSITION (CMP) SENSOR

A6E394018881T05

Outline

•

For cylinder identification, the CMP sensor detects a camshaft angle of 30 degree after the top dead center in 
cylinder No. 1.

•

The wave form of CMP sensor output is shown in the figure.

.

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CRANKSHAFT POSITION (CKP) SENSOR

A6E394018881T06

Outline

•

For detecting the crankshaft angle, the CKP sensor detects pulsation signals from pulse wheel.

•

The wave form of CKP sensor output is shown in the figure.

.

A6E3940T021

1

CMP sensor

2

Camshaft for inlet valve

3

Camshaft angle 30 degree

4

Crankshaft angle

5

CMP sensor output signal

6

LF and L8 engine model

7

L3 engine model

A6E3940T022

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