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(6) A/C control
The air conditioner is controlled by the A/C compressor of the engine ECU according to the signal from
the heater and A/C control assembly. The driver can see the air conditioner operation through the LCD
display and the indicator of the A/C switch.
Manual control
Pressing the A/C switch or selecting defrost mode turns on the A/C.
Auto control
The A/C is controlled in accordance with the indoor temperature and ambient temperature.
or below) in winter, the compressor is turned off to protect the A/C compressor.
A/C switch
LCD display (A/C operation view)
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(7) Self-diagnosis
Diagnostic trouble code
The FATC has a self-diagnosis function that can diagnose the system by itself. If this system is
defective, the LCD display shows the diagnostic trouble code (DTC) to inform a driver of defects on the
device such as a sensor or actuator. The driver can see the each sensor data on the air conditioning
system after entering self-diagnosis mode. Before checking each component, be sure to check the
default code by using self diagnosis function.
The diagnostic trouble code (DTC)
flashes twice and is displayed
repeatedly in order as long as a
separate operation is not performed.
Code Defective part
00 Normal
21 Ambient temperature sensor
22 Incar sensor
23 Water temperature sensor
24 Intake sensor
26 Temp door (control)
31 Mode door (vent)
32 Mode door (bi-level)
33 Temp door (cool)
34 Mode door (foot)
35 Mode door (defroster & foot)
36 Mode door (defroster)
37 Intake door (fresh air)
38 Intake door (1/3)
39 Intake door (recirculation)Diagnostic trouble code
Open circuit in sensor
Diagnostic trouble code
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How to enter self-diagnosis
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If the ON/OFF switch of the FATC is pressed for more than 5 seconds within 10 seconds after turning
the ignition key from the "OFF" position to the "ON" position, all the segments in LCD display comes on
for 3 seconds. 1.
The LCD display shows "2" and starts to check the sensor and actuator in the air conditioning system
automatically. 2.
3.
The self diagnosis ends when turning the ignition key from the "OFF" position to the "ON" position or
pressing the AUTO mode switch. 4.
Press for more
than 5 sec.
Segments comes on for 3 sec.
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This mode can be entered when the temperature control dial is turned clockwise (1 click or more) at
any time after entering self-diagnosis mode, and the LCD display shows "51". 1.
The values for each sensor are shown in sequence on the LCD display each time the defroster switch
is pressed. 2.
When the temperature control dial is turned anti-clockwise, the menu returns to status when entering
self-diagnosis mode. 3.Sensor data check
The value of the sun load sensor is displayed after being converted to one tenth.
Defroster switch
Temperature control dial
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4. MTC SYSTEM OPERATION PROCESS
1) Input/Output Factors
The MTC (Manual Temperature Control) system controls all the actuator and blower motor by the driver.
The heater and A/C control assembly with MTC has the dials and switches with the indicators so that the
driver can know the air conditioning system's operation.
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2) Function
(1) Function of heater and A/C control assembly with MTC
Fan speed dial
Turn the dial to the left
or right to adjust the fan
speed in 7 steps.
A/C switch
When the switch is
pressed, the indicator
comes on and the air
conditioner starts at the
same time. Pressing the
switch again goes out
the indicator and stops
the air conditioner at the
same time.
Vent mode switch
If the switch is pressed, the
indicator comes on while the
air flows to the upper part of
the body.
Bi-level mode switch
If the switch is pressed, the
indicator comes on while the
air flows to the footwell and
the upper part of the body.
MAX A/C control switch
This is designed for increasing driver
comfort. When the switch is pressed,
the indicator comes on and the air
conditioner starts at the same time
and vent and recirculation modes are
selected automatically.Defroster mode switch
This is used to remove the
condensation from the
windshield. When you press the
switch, the indicator comes on
and the air distribution is
changed to the windshield at
the same time, then the air
conditioner starts to operate.Defroster & foot mode
switch
If the switch is pressed,
the indicator comes on
while the air flows to the
footwell and the
windshield.
Foot mode switch
If the switch is pressed, the indicator
comes on while the air flows to the
footwell.
Temperature
control dial
Turn the dial to the
left or right to adjust
the set temperature.
Air source selection
switch
When the switch is pressed, the
indicator comes on and the
mode is switched to the
recirculation mode at the same
time. When pressed again, the
indicator goes out and switched
to the fresh air mode at the
same time.
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(2) Temperature control
The temp actuator controls the temperature of air discharged depending on the temperature control dial
operation by the driver. The driver can select one of the 17 levels.
Blower
stepBlower motor voltage
(V)
14.0
25.0
36.0
47.5
59.0
610.5
7 VIGN
(3) Blower control
The fan speed increments by 1 level per
revolution of the fan speed dial. (allowance:
Temperature control dial
Fan speed dial