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10C-42
FATC SYSTEM CHARACTERISTIC
Display Performance Enhancement
It allows VFD (Vacuum Fluorescent Display) to develop
the effect of the visible.
Airflow Control Enhancement
It allows MICOM to control the temperature and perform
the control automatically of the heating operation, the cool-
ing operation and the Mild operation. Also, MICOM enable
to control the amount of the airflow and the direction of the
vent outlet in order to keep the inside air fresh.
Self-Diagnostic Circuit Check
The full automatic temperature control (FATC) air condi-
tioning controller contains a self-diagnosis function to aid
in finding any problem with the system. If the FATC de-
tects some errors it will blink the temperature display
screen for 5 seconds when the ignition switch is ON.
To enter the diagnostic mode, perform the following procedure.
1. Turn the ignition switch ON.
2. Set the temperature control to 26°C (79°F).
3. Within 3 seconds, push the AUTO and the OFF
switches simultaneously, more than three times.
4. Check the diagnostic trouble code (DTC) in the
temperature indicator screen blinks. If there are no
diagnostic trouble code (DTC) set, the screen will
display 00.
5. When the FATC controller indicates a DTC, proceed
to the table for the DTC.
6. Push the OFF switch to return the controller to its
normal function.
DTC
0
Normal (No Error)
1
Inside Air Temperature Sensor Error
2
Ambient Air Temperature Sensor Error
3
Coolant Temperature Sensor Error
4
Air Mix Door Error
5
Sun Sensor Error
6
Power Transistor Error
7
High Blower Relay Error
Action taken when the faulty occurred
When any faulty is occurred in the automatic temperature
control system, it's sign is informed to the driver by flashing
the set temperature display for 5 seconds at initial starting.
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
Description
How to verify faulty code
When the temperature is set to 26°C and then within 3
second, push the AMB switch and the OFF switch simul-
taneously at three times, the FATC controller tempera-
ture display indicates the faulty code after performing the
self-diagnosis by MICOM.
Condition for clearing the faulty code
1. When the vehicle restarts
2. When push the OFF switch after indicating the faulty
code
3. When pass over 32 seconds after indicating the
faulty code
Fault safety function
FATC air conditioner not only performs self-diagnosis but
also has safety function against faults. If there is open or
short in the sensors or potentiometer of temperature door
some specific value will be substitute.
Error
Inside air Sensor Error
Ambient Temperature
Sensor Error
Coolant Temperature
Sensor Error
Sun Sensor Error
Y220_10C064
Fault Safety Function
25°C will be substituted as
temperature of inside of
vehicle.
25°C will be substituted as
ambient temperature.
Sensor ON. 50°C will be
substituted as coolant
temperature.
Zero (0) will be substituted
as sun load.
A/C SYSTEM
REXTON SM - 2004.4
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