Kia Sedona (2008 year). Instruction — part 234

DTC DETECTING CONDITION CHART

SPECIFICATION

Refer to DTC B1233.

MONITOR SCAN TOOL DATA

1. Connect scan tool to data link connector (DLC).

2. Engine "ON"

3. Monitor the "IN-CAR TEMP. SENSOR" Parameter on the scan tool.

Fig. 65: Diagnosis Function Screen Display - In-Car Temp Sensor
Courtesy of KIA MOTORS AMERICA, INC.

4. Are the DTC B1234 present and is parameter of "IN-CAR TEMP. SENSOR" fixed?

Parameter of "IN-CAR TEMP. SENSOR" will be fixed at 25°C (77°F), if there is any fault in IN-CAR
TEMP. SENSOR.

YES

Go to TERMINAL AND CONNECTOR INSPECTION procedure.

Item

Detecting Condition

Possible cause

DTC Strategy



Resistance check



Open Circuit in harness



Faulty in-car temp. Sensor



Faulty A/C control unit

Threshold value



> 509.57 kohms

Detecting time



0.3 sec

FAIL SAFE



Control with the value of 25°C (77°F)

2008 Kia Sedona EX

2008 HVAC Blower & A/C Controls (Automatic) - Sedona

Microsoft

Monday, May 24, 2010 3:56:07 PM

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© 2006 Mitchell Repair Information Company, LLC.

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

Refer to DTC B1233.

SIGNAL CIRCUIT INSPECTION

1. Check for open in harness.

1. Ignition "OFF"

2. Disconnect in-car temp, sensor.

3. Measure resistance between terminal "4" of in-car temp, sensor and terminal "3" of A/C Control

Unit.

Specification: Approx. 0 ohms

Fig. 66: Checking Resistance Between Terminal "4" Of In-Car Temp, Sensor And Terminal
"3" Of A/C Control Unit
Courtesy of KIA MOTORS AMERICA, INC.

4. Is the measured resistance within specifications?

YES

Go to "GROUND CIRCUIT INSPECTION" procedure.

NO

Check for open in harness. Repair as necessary and go to "VERIFICATION OF VEHICLE

2008 Kia Sedona EX

2008 HVAC Blower & A/C Controls (Automatic) - Sedona

Microsoft

Monday, May 24, 2010 3:56:07 PM

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© 2006 Mitchell Repair Information Company, LLC.

REPAIR" procedure.

GROUND CIRCUIT INSPECTION

1. Check for open in ground harness.

1. Ignition "OFF"

2. Disconnect in-car temp, sensor.

3. Measure resistance between terminal "2" of in-car temp, sensor and terminal "11" of A/C Control

Unit.

Specification: Approx. 0 ohms

Fig. 67: Checking Resistance Between Terminal "2" Of In-Car Temp, Sensor And Terminal
"11" Of A/C Control Unit
Courtesy of KIA MOTORS AMERICA, INC.

4. Is the measured resistance within specifications?

YES

Go to "COMPONENT INSPECTION" procedure.

NO

Check for open in ground harness. Repair as necessary and go to "VERIFICATION OF
VEHICLE REPAIR" procedure.

COMPONENT INSPECTION

Refer to DTC B1233.

VERIFICATION OF VEHICLE REPAIR

Refer to DTC B1233.

2008 Kia Sedona EX

2008 HVAC Blower & A/C Controls (Automatic) - Sedona

Microsoft

Monday, May 24, 2010 3:56:08 PM

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© 2006 Mitchell Repair Information Company, LLC.

DTC B1237 AMBIENT TEMPERATURE SENSOR SHORT (LOW)

COMPONENT LOCATION

Fig. 68: 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 B1237 if there is a short circuit in ambient temp, sensor signal harness or the
measured resistance value of sensor is less than threshold value (about 7.48kohms)

DTC DETECTING CONDITION

DTC DETECTING CONDITION CHART

SPECIFICATION

TEMPERATURE SPECIFICATION

Item

Detecting Condition

Possible cause

DTC Strategy



Resistance check



Short circuit in harness



Faulty ambient temp. Sensor



Faulty A/C control unit

Threshold value



< 7.48 k ohms

Detecting time



0.3 sec

FAIL SAFE



Control with the value of 20°C (68°F)

Temperature [°C (°F)]

Resistance (kohms)

Temperature [°C (°F)]

Resistance (kohms)

2008 Kia Sedona EX

2008 HVAC Blower & A/C Controls (Automatic) - Sedona

Microsoft

Monday, May 24, 2010 3:56:08 PM

Page 61

© 2006 Mitchell Repair Information Company, LLC.