Kia Rio: Heater & A/C Control Unit (FATC) Self Diagnosis - Controller - Heating,Ventilation, Air Conditioning - Kia Rio UB 2012-2019 Service ManualKia Rio: Heater & A/C Control Unit (FATC) Self Diagnosis

1.
Self-diagnosis process


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
Fail description
00
Normal
11
In-car sensor open
12
In-car sensor short
13
Ambient temperature sensor open
14
Ambient temperature sensor short
17
Evaporator temperature sensor open
18
Evaporator temperature sensor short
19
Temperature door potentiometer open/short
20
Temperature door potentiometer fault
21
Mode door potentiometer open/short
22
Mode door potentiometer fault
25
Intake door potentiometer open/short
26
Intake door potentiometer fault
43
Foot door potentiometer open/short
44
Foot door potentiometer fault
45
APT (A/C Pressure Transducer) CAN signal fault
47
RPM CAN signal fault
48
Vehicle speed CAN signal fault
49
Engine coolant temperature CAN signal fault
50
Cluster ionizer fault
51
Auto defogging sensor communication and sensor input fault

3.
Fault code display
(1)
Continuance operation: DTC code is none or one.


(2)
Continuance operation: DTC code is two or more.


(3)
STEP operation
A.
Normal or one fault code is same as a continuance operation.
B.
DTC code is two or more.


4.
If fault codes are displayed during the check, inspect malfunction causes by referring to fault codes table.
5.
Fail safe
No
Sensor
Fail condition
Fail safe function
1
In-car sensor
< 0.1V or > 4.9V
23C (73.4F)
2
Ambient temperature sensor
< 0.1V or > 4.9V
20C (68F)
3
Evaporator temperature sensor
< 0.1V or > 4.9V
 -2C (28.4F)
4
Temperature control actuator feedback
< 0.1V or > 4.9V
Setting temperature is 24.5C (76.1F) or below: Max cool
Setting temperature is 25.0C (77F) or above: Max hot
5
Mode control actuator feedback
< 0.5V or > 4.5V
Vent: Vent
Others: Defog
6
Intake actuator feedback
< 0.1V or > 4.9V
Recirculation: Recirculation
Others: Fresh
7
Foot actuator feedback
< 0.5V or > 4.5V
Vent: Open
Others: Close
8
Auto defogging sensor
(Relative humidity)
Communication fail
Relative humidity: 60%,
Surrounding temperature : 23C (73.4F)
9
Auto defogging sensor
(Glass temperature)
< 0.1V or > 4.9V
Glass temperature : 23C(73.4F)
10
Engine coolant temperature
Communication fail
85C (185F)
11
ECV feedback
No input of ECV
feedback signal
ECV fault signal : 1
PWM control output : maintain
Torgue : 0

Heater & A/C Control Unit (FATC) Schematic Diagrams
...

Heater & A/C Control Unit (FATC) Replacement
1. Disconnect the negative (-) battery terminal. 2. Remove the heater & A/C controller (A) from the center facia using a flat-head scre ...

See also:

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Display settings
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Installation
1. Connect the horn connector, then reassemble the horn. ...

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