Hyundai Santa Fe (2006 year). Manual — part 668
HA -50
HEATING, VENTILATION AND AIR CONDITIONING
PTC (POSITIVE TEMPERATURE
COEFFICIENT) HEATER
DESCRIPTION
EC3EA1C9
PTC (Positive Temperature Coefficient) heater (A) is
an electric heater using a PTC element as an auxiliary
heating device that supplements deficiency of interior
heat source in highly effective diesel engine (U engine).
A
SCMHA6152D
An electric heater heats up the interior by directly heating
the air that passes through the heater.
PTC = positive Temperature Coefficient
The name itself implies that the element has a proportional
resistance change sensitive to temperature. PTC heater
is installed at the exit or the backside of heater core.
AQJF301A
OPERATION PRINCIPLE
ECM outputs a PTC on signal. Operate PTC from 1st
setting to 3rd setting with an interval of 15 seconds.
Heat up the air, which passes through a heater core.
GND
2
1
3
Connector
LQJF301C
OPERATION CONDITION
Judge the condition by ambient temperature is below 5 C,
coolant temperature is below 70 C, and battery voltage is
above 11V and engine RPM is above 700RPM.
HEATER
HA -51
INSPECTION
EBEBB6AB
Inspect the PTC operation by confirmation logic as below.
1.
Entering method
1) Set the floor mode, maximum heating
2) Turn off the blower switch
3) Press the intake button more than 5 times.
4) Indicator of entire button is flashed with an inter-
val of 0.5 seconds continuously (Manual).
Graphics of the entire LCD display switch on and
off with an interval of 0.5 seconds continuously
(Automatic)
5) Confirm the PTC operation by operating the
blower switch
Manual : 1~4 step, Automatic: 1~8step.
6) Each PTC relay is operated with an interval of 3
seconds.
7) Execute the PTC operation by confirmation logic
for 30 seconds.
2.
Cancellation method
1) Select the A/C button or intake button.
2) IG "OFF".
3) Cancel the logic after 30 seconds automatically.
3.
If the PTC operation is not operated, substitute with a
known-good PTC and check for proper operation.
If the problem is corrected, replace the PTC.
REPLACEMENT
EFACC0BC
1.
Remove the crash pad glove box. (Refer to BD -
Crash pad)
2.
After loosen the PTC heater mounting serew, remove
the PTC heater(A).
A
SCMHA6155D
3.
Remove the PTC heatoer(A).
B
SCMHA6156D
HA -52
HEATING, VENTILATION AND AIR CONDITIONING
TEMPERATURE CONTROL
ACTUATOR
COMPONENT LOCATION
EFC61DF9
Temp control actuator
SCMHA6157L
HEATER
HA -53
DESCRIPTION
EEB86C0E
1.
Heater unit includes mode control actuator and tem-
perature control actuator.
2.
Temperature control actuator is located at the heater
unit. It regulates the temperature by the procedure
as follows. Signal from control unit adjusts position
of temperature door by operating temperature switch
and then temperature will be regulated by the hot/cold
air ratio decided by position of temperature door
INSPECTION
EAE4CBCC
1.
Ignition "OFF"
2.
Disconnect the connector of temperature control ac-
tuator.
3.
Verify that the temperature control actuator operates
to the hot position when connecting 12V to the termi-
nal 3 and grounding terminal 4.
Verify that the temperature control actuator operates
to the cool position when connecting in the reverse.
[DRIVER]
1
2
3
4
5
6
7
3
4
5
1
2
M
1. -
2. -
3. Cool position
4. Hot position
5. 5V (VCC)
6. Feedback signal
7. Sensor ground
SCMHA6303L
SPECIFICATION
Door position
Voltage (6-7)
Error detecting
Max. cooling
0.3 ± 0.15V
Low voltage :
0.1V or less
Max. heating
4.7 ± 0.15V
High voltage :
4.9V or more
[PASSENGER]
1
2
3
4
5
6
7
3
4
5
1
2
M
1. -
2. -
3. Hot position
4. Cool position
5. Sensor ground
6. Feedback signal
7. 5V (VCC)
SCMHA6304L
SPECIFICATION
Door position
Voltage (5-6)
Error detecting
Max. cooling
0.3 ± 0.15V
Low voltage :
0.1V or less
Max. heating
4.7 ± 0.15V
High voltage :
4.9V or more
It will feedback current position of actuator to controls.
4.
If the measured voltage is not specification, substitute
with a known-good temperature control actuator and
check for proper operation.
5.
If the problem is corrected, replace the temperature
control actuator.
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