Kia Sedona (2008 year). Instruction — part 236
Fig. 73: Checking Voltage Between Terminal "4" Of A/C Control Unit And Chassis Ground
Courtesy of KIA MOTORS AMERICA, INC.
4. Is the measured voltage within specifications?
YES
Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration,
or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE
REPAIR" procedure.
NO
Substitute with a known-good A/C Control Unit and check for proper operation.
If the problem is corrected, replace A/C Control Unit and then go to "VERIFICATION OF
VEHICLE REPAIR" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode and then clear DTC.
2. Operate the vehicle and monitor the DTC on the scan tool.
3. Are any DTCs present?
YES
Go to the applicable troubleshooting procedure.
NO
System is performing to specification at this time.
DTC B1238 AMBIENT TEMPERATURE SENSOR OPEN (HIGH)
2008 Kia Sedona EX
2008 HVAC Blower & A/C Controls (Automatic) - Sedona
Microsoft
Monday, May 24, 2010 3:56:08 PM
Page 66
© 2006 Mitchell Repair Information Company, LLC.
COMPONENT LOCATION
Fig. 74: Identifying Ambient Temperature Sensor Component Location
Courtesy of KIA MOTORS AMERICA, INC.
GENERAL DESCRIPTION
The ambient temperature senor located at the center stay of the condenser, detects ambient air temperature. It is
a negative type thermistor whose resistance is inversely proportional to temperature. Its output is used for
discharge temperature sensor, sensor fail-safe, temperature regulation door lock, blower motor level control,
mix mode control and in-car humidity control.
DTC DESCRIPTION
The A/C controller sets DTC B1238 if there is an open circuit in ambient temp, sensor signal harness or the
measured resistance value of sensor is more than threshold value (about 527kohms)
DTC DETECTING CONDITION
DTC DETECTING CONDITION CHART
SPECIFICATION
TEMPERATURE SPECIFICATION
Item
Detecting Condition
Possible cause
DTC Strategy
Resistance check
Open Circuit in harness
Faulty ambient temp. Sensor
Faulty A/C control unit
Threshold value
> 527kohms
Detecting time
0.3 sec
FAIL SAFE
Control with the value of 20°C (67°F)
Temperature [°C (°F)]
Resistance (kohms)
Temperature [°C (°F)]
Resistance (kohms)
-30 (-22)
527.99
25 (77)
30
-15 (5)
218.21
35 (95)
19.6
2008 Kia Sedona EX
2008 HVAC Blower & A/C Controls (Automatic) - Sedona
Microsoft
Monday, May 24, 2010 3:56:08 PM
Page 67
© 2006 Mitchell Repair Information Company, LLC.
MONITOR SCAN TOOL DATA
1. Connect scan tool to Data Link Connector (DLC).
2. Engine "ON"
3. Monitor the "AMBIENT TEMP. SENSOR" Parameter on the scan tool.
Parameter of "AMBIENT TEMP. SENSOR" will be fixed at 20°C (67°F), if there is any fault in
AMBIENT TEMP. SENSOR.
Fig. 75: Diagnosis Function Screen Display - Ambient Air Temp. Sensor
Courtesy of KIA MOTORS AMERICA, INC.
4. Are the DTC B1238 present and is parameter of "AMBIENT TEMP. SENSOR" fixed?
YES
Go to TERMINAL AND CONNECTOR INSPECTION procedure.
NO
Fault is intermittent caused by poor contact in the sensor's and/or A/C controller's connector or was
repaired and A/C controller memory was not cleared. Thoroughly check connectors for looseness, poor
connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary
and then go to "VERIFICATION OF VEHICLE REPAIR" procedure.
TERMINAL AND CONNECTOR INSPECTION
0 (32)
97.83
50 (122)
10.82
15 (59)
47.12
60 (140)
7.48
2008 Kia Sedona EX
2008 HVAC Blower & A/C Controls (Automatic) - Sedona
Microsoft
Monday, May 24, 2010 3:56:08 PM
Page 68
© 2006 Mitchell Repair Information Company, LLC.
1. Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical
damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination,
deterioration, or damage.
3. Has a problem been found?
YES
Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR" procedure.
NO
Go to "SIGNAL CIRCUIT INSPECTION" procedure.
SIGNAL CIRCUIT INSPECTION
1. Check for open in harness.
1. Ignition "OFF"
2. Disconnect ambient temp, sensor.
3. Measure resistance between terminal "1" of ambient temp, sensor and terminal "4" of A/C Control
Unit.
Specification: Approx. 0 ohms
Fig. 76: Checking Resistance Between Terminal "1" Of Ambient Temp, Sensor And
Terminal "4" Of A/C Control Unit
Courtesy of KIA MOTORS AMERICA, INC.
4. Is the measured resistance within specifications?
2008 Kia Sedona EX
2008 HVAC Blower & A/C Controls (Automatic) - Sedona
Microsoft
Monday, May 24, 2010 3:56:08 PM
Page 69
© 2006 Mitchell Repair Information Company, LLC.
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