2007 KIA CARNIVAL ignition

2007 > 2.7L V6 GASOLINE >
INSPECTION
1.Ignition "ON"
2. Using the multi- tester, Measure resistance between terminal "1" and "2" of water temperature sensor.
Specification
Coolant temperature [°C(°F)] Resistance (kΩ)Voltage (V)
- 10(14) 55.85 ± 3% 4.24 ± 3%
0(32) 32.91 ± 3% 3.83 ± 3%
10(50) 19.99 ± 3% 3.33 ± 3%
20(68) 12.51 ± 3% 2.78 ± 3%
30(86) 8.047 ± 3% 2.23 ± 3%
40(104) 5.311 ± 3% 1.73 ± 3%
50(122) 3.588 ± 3% 1.32 ± 3%
60(140) 2.476 ± 3% 0.99 ± 3%
70(158) 1.742 ±3% 0.74 ± 3%
80(176) 1.246 ± 3% 0.55 ± 3%
3. If the measured resistance is not specification, substitute with a known- good water temperature sensor and check
for proper operation.
4. If the problem is corrected, replace the water temperature sensor.
Negative type thermistor that resistance will rise with lower temperature, and reduce with higher temperature.
REPLACEMENT
1.Disconnect the negative ( - ) battery terminal.
2. Remove the grove box. (Refer to BD group)
3. Disconnect the connector (B) of water temperature sensor and then remove the water temperature sensor(A) by
pulling out.

2007 > 2.7L V6 GASOLINE >
INSPECTION
1.Ignition "OFF"
2. Disconnect ambient temperature sensor.
3. Check the resistance of ambient temperature sensor between terminals 1 and 2 whether it is changed by changing
of the ambient temperature.
Specification
Ambient temperature [°C(°F)] Resistance between terminals 1and 2 (kΩ)
- 10(14) 164 ± 3%
0 (32) 97.5 ± 3%
10 (50) 59.6 ± 3%
20 (68) 37.5 ± 3%
4.If the measured resistance is not specification, substitute with a known- good ambient temperature sensor and
check for proper operation.
5. If the problem is corrected, replace the ambient temperature sensor.
REPLACEMENT
1.Disconnect the negative ( - ) battery terminal.
2. Remove the front bumper. (Refer to BD group)
3. Remove the ambient temperature sensor (A).
4.Installation is the reverse order of removal.

2007 > 2.7L V6 GASOLINE >
INSPECTION
1.Ignition "ON"
2. Using the scan tool.
3. Check the output voltage of AQS between terminals 2 and 3.
Specification
Condition Output signal Fresh/recirculation
Normal condition 4 ~ 5VFresh
Hazardous gas detection 0 ~ 1VRecirculation
4.AQS diagnosis and fail safe
Detect the open of signal for 7 seconds without choosing the AQS switch when IG on.
If 2.5V or more is detected for 3.5 seconds or more among 7 seconds, be judged the open of AQS signal.
Operate as below fail safe function, while choosing AQS.
Fail safe: Release the AQS (AQS cannot be selected), Fresh/recirculation maintains previous situation of AQS
selection.
When IG is turned ON, AQS heats for 34±5 seconds, it will output below 1.0 voltage during this time.
REPLACEMENT
1.Disconnect the negative ( - ) battery terminal.
2. Remove the front bumper (Refer to BD group).
3. Remove the AQS (A) after loosening the mounting screws (B).
4.Installation is the reverse order of removal.

2007 > 2.7L V6 GASOLINE >
INSPECTION
1.Ignition "ON"
2. Using the scan tool.
3. Check the frequency of humidity sensor between terminals 2 and 3.
Humidity (%) Frequency between terminals 2and 3 (Hz)
30 6976 ± 5%
50 6728 ± 5%
60 6600 ± 5%
70 6468 ± 5%
80 6330 ± 5%
90 6186 ± 5%
4. If the measured resistance is not specification, substitute with a known- good humidity sensor and check for proper
operation.
5. If the problem is corrected, replace the Humidity sensor.
REPLACEMENT
1.Disconnect the negative ( - ) battery terminal.
2. Remove the center facia lower panel (A). (Refer to BD group)
3. Disconnect the humidity sensor connector (A).
4. Loosen 2 screws and then remove the humidity sensor (B).
5.Installation is the reverse order of removal.

2007 > 2.7L V6 GASOLINE >
INSPECTION
1.Ignition "OFF"
2. Disconnect the connector of temperature control actuator.
3. Verify that the temperature control actuator operates to the hot position when connecting 12V to the terminal 1 and
grounding terminal 2.
Verify that the temperature control actuator operates to the cool position when connecting in the reverse.
[PASSENGER]
Specification
Door position Voltage (3- 4)Error detecting
Max. cooling 0.4 ± 0.15VLow voltage : 0.1V or less
Max. heating 4.6 ± 0.15VHigh voltage :4.9V or more
[DRIVER]
Specification
Door position Voltage (4- 5)Error detecting
Max. cooling 0.4 ± 0.15VLow voltage : 0.1V or less
Max. heating 4.6 ± 0.15VHigh 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.
REPLACEMENT

2007 > 2.7L V6 GASOLINE >
INSPECTION
1.Ignition "OFF"
2. Disconnect the connector of mode control actuator.
3. Verify that the mode control actuator operates to the defrost mode when connecting 12V to the terminal 1 and
grounding terminal 2.
4. Verify that the mode control actuator operates to the vent mode when connecting in the reverse.
[DRIVER]
[PASSENGER]
5.Check the voltage between terminals 3 and 4.
Door position Voltage (3- 4)Error detecting
Vent 0.4 ± 0.15VLow voltage :0.1V or less
Defrost 4.6 ± 0.15VHigh voltage :4.9V or more
It will feedback current position of actuator to controls.
6. If the measured voltage is not specification, substitute with a known- good mode control actuator and check for
proper operation.
7. If the problem is corrected, replace the mode control actuator.
REPLACEMENT
1.Disconnect the negative ( - ) battery terminal.
2. Remove the driver’s crush pad lower panel (Refer to BD group).
3. Disconnect the temperature control actuator connector (A) after removing the air duct.
4. Loosen the mounting screw and then remove the temperature control actuator (B).

2007 > 2.7L V6 GASOLINE >
DESCRIPTION
The fuel fired heater has been applied to the diesel engine (CRDi) to increase heating capability by using diesel only in
cold weather
a.Follow the procedures specified in this bulletin during service or it may cause personal injury.
b. Be sure to turn the fuel fired heater off when refueling at station.
c. The fuel fired heater must be mounted at designated position, never in the passenger compartment.
d. The fuel fired heater must be kept below 120°C or a permanent failure on the components may occur.
e. Operational principle : The following 3 conditions should be met at the same time for automatic operation of
the fuel fired heater.
a. Engine runs.
b. Ambient temperature is lower than 2°C (Winter)
c. Coolant temperature is lower than 68°C
f. Cleaning process
a. A cleaning process of the fuel fired heater will be performed automatically when the heater is not operated
due to increase of coolant temperature and ignition off.
b. During cleaning process, supplied fuel in the heater will be burnt completely and any smoke will be expelled.
It is a necessary process for next operation and durability of the heater and takes about 3 minutes.
g. Others
The following symptoms should be explained to customers or technicians as a normal occurrence.
a. A white smoke may come out from the fuel fired heater exhaust pipe installed at the front side of the right
front tire during operation of the heater.
This is not an exhaust fumes.
When moisture in the fuel and air is discharged from the heater and is met cold ambient air, it is condensed
and looks like a white smoke however, when an excessive black smoke is discharged, the fuel fired heater
should be inspected.
b. A "buk- buk" noise from the heater is a noise to form flame for combustion. This is a normal operation.
c. When the heater is operated at full load, a "Wooing" noise is occurred.
d. When shutting off the engine during heater operation, a "Wing" noise is occurred to perform the cleaning
process.
OVERVIEW
1.This fuel fired heater supplies additional heat to the interior compartment with a low fuel consumption to
compensate the heat provided by engine alone.
2. The fuel fired heater has been adopted to warm up the interior compartment in a short time.

3.The two coolant temperature sensors are installed to the heater inner. The sensor valves determine heater
operation.
4. One of the temperature sensors functions to prevent the heater from overheating.
If the sensor temperature valve exceeds 125°C, the fuel will be cut and the heater will be deactivated by the
determination of the overheating of the heater.
The other temperature sensor determines the operation mode of the fuel fired heater.The temperature of this
sensor enables to activate the heater at full load(5kw) or half load(2.5kw).
• The coolant temperature shown on the above Figure is the value of the inner sensor and the actual coolant
temperature is higher about 5°C ~7°C than the above value.
OPERATION
Switch on/ Operation start
The fuel fired heater is operated when the coolant temperature is below 68°C and the ambient temperature is below
2°C after starting the engine.
At this time, the glow plug and combustion air fan are operated first and after 30 seconds, the dosing pump is
operated with stopping the combustion fan for 3 seconds.
After that, the operation of the fan increases continuously until it approaches to full load within 56 seconds. If fuel
supply reaches to full load the glow plug does not operate and the operation of the fan reaches to full load.
After that the glow plug monitors ignition condition as a flame sensor for 45 seconds.
The above operation procedure is done automatically and in case the ignition fails, the above operation will be done
again automatically.
If the condition of ignition failure sustains continuously, fuel supply and fan operation will be stopped and error codes
will be stored to find cause of failure.
Generally, the cause of ignition failure during combustion is caused by the automatic re- operation of the above
procedure.
Operation for heating
The fuel fired heater operates at full load when the coolant temperature is below 68°C and the ambient temperature is
below 2°C after starting the engine.
It operates at half load when the coolant temperature is 74°C and it operates at idle mode when the coolant
temperature is 78°C.
The fuel fired heater during the transformation process does a cleaning function from the half mode to the idle mode.
At idle mode, all components do not work.
The fuel fired heater operating at idle mode turns into the half load when the coolant temperature is 74°C. At this time,
if the coolant temperature drops again below 68°C, the heater operates with full load and turns into the idle mode if
the temperature is 78°C.
This serial operating process is performed automatically.
Key switch off / Operation stop
The fuel fired heater ECU stops the operation of the fuel pump and cuts fuel supply when shutting off the engine
during the heater operation.
The heater conducts cleaning operation at this time.
This is a process of burning the fuel completely supplied in the heater inner.
In this process, the glow plug and combustion air fan are operated.