Kia Rio: Heater & A/C Control Unit (FATC) Self Diagnosis
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1. |
Self-diagnosis process
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2. |
How to read self-diagnostic code
During the self-diagnosis, the corresponding fault code flickers
on the setup temperature display panel every 0.5 second and will show
two figures.
Fault codes are displayed in numerical format.
Display
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Fail description
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00
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Normal
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11
|
In-car sensor open
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12
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In-car sensor short
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13
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Ambient temperature sensor open
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14
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Ambient temperature sensor short
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17
|
Evaporator temperature sensor open
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18
|
Evaporator temperature sensor short
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19
|
Temperature door potentiometer open/short
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20
|
Temperature door potentiometer fault
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21
|
Mode door potentiometer open/short
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22
|
Mode door potentiometer fault
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25
|
Intake door potentiometer open/short
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26
|
Intake door potentiometer fault
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43
|
Foot door potentiometer open/short
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44
|
Foot door potentiometer fault
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45
|
APT (A/C Pressure Transducer) CAN signal fault
|
47
|
RPM CAN signal fault
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48
|
Vehicle speed CAN signal fault
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49
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Engine coolant temperature CAN signal fault
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50
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Cluster ionizer fault
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51
|
Auto defogging sensor communication and sensor input fault
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3. |
Fault code display
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(1) |
Continuance operation: DTC code is none or one.
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(2) |
Continuance operation: DTC code is two or more.
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|
(3) |
STEP operation
| A. |
Normal or one fault code is same as a continuance
operation.
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| B. |
DTC code is two or more.
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4. |
If fault codes are displayed during the check, inspect malfunction
causes by referring to fault codes table.
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5. |
Fail safe
No
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Sensor
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Fail condition
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Fail safe function
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1
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In-car sensor
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< 0.1V or > 4.9V
|
23°C (73.4°F)
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2
|
Ambient temperature sensor
|
< 0.1V or > 4.9V
|
20°C (68°F)
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3
|
Evaporator temperature sensor
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< 0.1V or > 4.9V
|
-2°C (28.4°F)
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4
|
Temperature control actuator feedback
|
< 0.1V or > 4.9V
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• |
Setting temperature is 24.5°C (76.1°F) or below:
Max cool
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• |
Setting temperature is 25.0°C (77°F) or above:
Max hot
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5
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Mode control actuator feedback
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< 0.5V or > 4.5V
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6
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Intake actuator feedback
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< 0.1V or > 4.9V
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• |
Recirculation: Recirculation
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7
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Foot actuator feedback
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< 0.5V or > 4.5V
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8
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Auto defogging sensor
(Relative humidity)
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Communication fail
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|
• |
Relative humidity: 60%,
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|
• |
Surrounding temperature : 23°C (73.4°F)
|
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9
|
Auto defogging sensor
(Glass temperature)
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< 0.1V or > 4.9V
|
Glass temperature : 23°C(73.4°F)
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10
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Engine coolant temperature
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Communication fail
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85°C (185°F)
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11
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ECV feedback
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No input of ECV
feedback signal
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|
• |
PWM control output : maintain
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1.
Disconnect the negative (-) battery terminal.
2.
Remove the heater & A/C controller (A) from the center facia using
a flat-head scre ...
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1.
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2.
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3.
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Heater & A/C Control Unit (FATC) Replacement