Mazda 6. Manual — part 86
CONTROL SYSTEM
U–17
U
Defroster Control
1. When the airflow mode selector dial is turned to DEFROSTER position, a wire moves the airflow mode main
link, turning the airflow mode to DEFROSTER.
2. The defroster switch turns on at the same time, and the CPU sends a signal to turn the air intake mode to
FRESH.
3. The air intake actuator operates and turns the air intake mode to FRESH.
.
X: Operates
–: Does not operate
A6E8540T034
1
Climate control unit
2
Airflow mode selector dial
3
DEFROSTER
4
Wire
5
Move
6
Airflow mode main link
7
Defroster switch
8
FRESH signal
9
Air intake actuator
10
FRESH
Airflow mode
Air intake mode (REC/FRESH switch
pushed)
Defroster control
VENT
REC
⇔
FRESH
–
BI-LEVEL
REC
⇔
FRESH
–
HEAT
REC
⇔
FRESH
–
HEAT/DEF
REC
⇔
FRESH
–
DEFROSTER
FRESH
x
U–18
CONTROL SYSTEM
A/C Compressor Control
•
The center panel sends an A/C signal to the PCM via the refrigerant pressure switch based on signals sent
from the A/C switch, fan switch and evaporator temperature sensor.
•
The PCM controls the A/C relay and IAC valve based on the input signal from the center panel.
.
A/C signal on/off control
•
The center panel turns the A/C signal (magnetic clutch) on and off based on the temperature of the air passing
through the evaporator when the A/C and fan switches are on. This keeps the evaporator surface temperature
within the specified range, preventing the evaporator from freezing while the fan switch and A/C switch are
turned on.
.
End Of Sie
A6E8540T049
1
Evaporator temperature sensor
2
A/C signal
3
Center panel
4
Output
5
A/C relay
6
Magnetic clutch
7
IAC valve
A6E8540T047
1
A/C signal on/off decision
2
Evaporator temperature sensor
3
A/C signal
CONTROL SYSTEM
U–19
U
FULL-AUTO AIR CONDITIONER CONTROL SYSTEM
A6E854001044T01
Block Diagram
•
The control system consists of input components (sensors), output components (actuators, magnetic clutch,
power MOS FET, and other parts), and a control device (climate control unit).
.
A6E8540T050
1
Ambient temperature sensor
2
Cabin temperature sensor
3
Water temperature sensor
4
Evaporator temperature sensor
5
Solar radiation sensor
6
Climate control unit
7
Airflow temperature control
8
Airflow volume control
9
Airflow mode control
10
Air intake control
11
A/C compressor control
12
Air mix actuator
13
Power MOS FET
14
Blower motor
15
Airflow mode actuator
16
Air intake actuator
17
Refrigerant pressure switch (HI and LO pressure)
18
Refrigerant pressure switch (middle pressure) (L3
engine only)
19
A/C cut control
20
Idle speed control
21
A/C relay
22
Thermal protector
23
Magnetic clutch
24
IAC valve
U–20
CONTROL SYSTEM
System Wiring Diagram
.
A6E8540T040
1
Ambient temperature sensor
2
Cabin temperature sensor
3
Evaporator temperature sensor
4
Water temperature sensor
5
Solar radiation sensor
6
From TNS relay
7
Panel light control
8
Climate control unit
9
Each switch
10
Refrigerant pressure switch
11
Airflow mode actuator
12
Air mix actuator
13
Air intake actuator
14
From blower relay
15
Blower motor
16
Power MOS FET
17
From rear window defroster relay
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