Hyundai Elantra: Heater & A/C Control Unit (DATC) Repair procedures - Controller - Heating, Ventilation and Air ConditioningHyundai Elantra: Heater & A/C Control Unit (DATC) Repair procedures

Self Diagnosis
1.
Self-diagnosis process.

   
When operating the self-diagnostics, the below fault (self-diagnostics code) will blink at 0.5 seconds interval on the temperature display settings (driver's side only) and the remaining symbols are OFF .
2.
Fault code display
(1)
Continuance operation : DTC code.

(2)
Continuance operation : DTC code.

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

3.
If fault codes are displayed during the check, Inspect malfunction causes by referring to fault codes.
Display
Fail description
0
Normal
11
Incar sensor OPEN
12
Incar sensor SHORT
13
Ambient sensor OPEN
14
Ambient sensor SHORT
17
Evaporator sensor OPEN
18
Evaporator sensor SHORT
19
Driver temp door potentionmeter OPEN or SHORT
20
Driver temp door potentionmeter Error
21
Mode door potentionmeter OPEN or SHORT
22
Mode door potentionmeter Error
23
Auto defog sensor OPEN
24
Auto defog sensor SHORT
25
Intake door potentionmeter OPEN or SHORT
26
Intake door potentionmeter Error
32
Passenger temp door potensionmeter OPEN or SHORT
33
Passenger temp door potention meter Error
45
APT CAN Signal Error
47
RPM CAN Signal Error
48
Vehicle speed CAN Signal Error
49
Engine coolant temprature CAN Signal Error
50
Cluster ionizer fault
71
ECV Fault (OPEN)

4.
Fail safe
NO
Item
Fault
Fail Safe
1
Incar sensor
Open or Short
Control with the value of 25°C(77.0°F)
2
Amblent sensor
Open or Short
Control with the value of 20°C(67°F)
3
Evaporator sensor
Open or Short
Control with the value of -2°C(28.4°F)
4
Mode door potentiometer
Open or Short
Fix vent position, while selecting vent mode.
Fix defrost position, while selecting all except vent mode.
5
Temperature door potentiometer (MTC)
Open or Short
If temperature setting 1 ~ 7 step, fix at maximum cooling position.
If temperature setting 8 ~ 15 step, fix at maximum heating position.
6
Temperature door potentiometer (DATC)
Open or Short
If temperature setting 17°C(62.6°F) ~ 24.5°C(76.1°F), fix at maximum cooling position.
If temperature setting 25°C(77°F) ~ 32°C(89.6°F), fix at maximum heating position.
7
Intake door potentiometer
Open or Short
Fix vent position, while selecting vent mode.
Fix defrost position, while selecting all except vent mode.
8
Engine RPM
FFh or NO reception
A/C OFF (Control with the value of 650 rpm)
9
Vehicle speed
FFh or NO reception
A/C OFF
10
Engine coolant temperature
FFh or NO reception
Control with the value of - 2°C(28.4°F)
11
APS
FFh or NO reception
Control with the value of 5%
12
R-TQACNAPVC
(Max Torque limitation of A/C Compressor)
FFh or NO reception
A/C OFF (Control with the value of 0 Nm)
13
R-PACNC
(APT Sensor Output Value)
FFh or NO reception
A/C OFF (Control with the value of 0 Nm)
14
RLY-AC
(Activation of air conditioner compressor relay)
FFh or NO reception
FFh

Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the glove box upper cover assembly.
(Refer to Body - "Glove Box Upper Cover Assembly")
3.
Loosen the mounting screws and remove the crash pad center lower cover [LH](A).

4.
After loosening the mounting screws, remove the A/C & heater controller unit (A).

5.
Disconnect the A/C & heater controller connectors (A) and hose (B).

6.
To intall, reverse the removal procedure.
   
Make sure the connector are connected in properly.
Replace any damaged clips.
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