Kia Sedona (2008 year). Instruction — part 237

YES

Go to "GROUND CIRCUIT INSPECTION" procedure.

NO

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

GROUND CIRCUIT INSPECTION

1. Check for open in ground harness.

1. Ignition "OFF"

2. Disconnect ambient temp, sensor.

3. Measure resistance between terminal "2" of ambient temp, sensor and chassis ground.

Specification: Approx. 0 ohms

Fig. 77: Checking Resistance Between Terminal "2" Of Ambient Temp, Sensor And Chassis
Ground
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

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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Refer to DTC B1237.

VERIFICATION OF VEHICLE REPAIR

Refer to DTC B1237.

DTC B1241 EVAPORATOR TEMPERATURE SENSOR SHORT (LOW)

COMPONENT LOCATION

Fig. 78: Identifying Evaporator Temperature Sensor Component Location
Courtesy of KIA MOTORS AMERICA, INC.

GENERAL DESCRIPTION

The Evaporator temperature sensor located on heater unit, detects the core temperature and interrupts
compressor relay power, in order to prevent evaporator freezing by excessive cooling. It is a negative type
thermistor whose resistance is inversely proportional to temperature.

DTC DESCRIPTION

The A/C controller sets DTC B1241 if there is a short circuit in evaporator temp, sensor signal harness or the
measured resistance value of sensor is less than threshold value (about 0.9kohms)

DTC DETECTING CONDITION

DTC DETECTING CONDITION CHART

Item

Detecting Condition

Possible cause

DTC Strategy



Resistance check



Short circuit in harness



Faulty Evaporator temp. Sensor



Faulty A/C control unit

Threshold value



< 0.9kohms

Detecting time



0.3 sec

FAIL SAFE



Control with the value of -2°C(28.4°F)

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.

SPECIFICATION

Resistance value of evaporator sensor as a function of temperature.

TEMPERATURE SPECIFICATION

MONITOR SCAN TOOL DATA

1. Connect scan tool to Data Link Connector (DLC).

2. Engine "ON"

3. Monitor the "EVAPORATIVE SENSOR" Parameter on the scan tool.

Fig. 79: Diagnosis Function Screen Display - Evaporative Sensor
Courtesy of KIA MOTORS AMERICA, INC.

4. Are the DTC B1241 present and is parameter of "EVAPORATIVE SENSOR" fixed?

Parameter of "EVAPORATIVE SENSOR" will be fixed at -2°C (28.4°F), if there is any fault in
EVAPORATIVE SENSOR.

YES

Go to TERMINAL AND CONNECTOR INSPECTION procedure.

NO

Temperature [°C (°F)]

Resistance (kohms)

Temperature [°C (°F)]

Resistance (kohms)

-10 (14)

13.6

15 (59)

3.9

0 (32)

8

30 (86)

2

5 (41)

6.2

40 (104)

1.3

10 (50)

4.9

50 (122)

0.9

2008 Kia Sedona EX

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

Microsoft

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

Page 72

© 2006 Mitchell Repair Information Company, LLC.

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

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 short to ground in harness.

1. Ignition "OFF"

2. Disconnect evaporator temp, sensor.

3. Measure resistance between terminal "1" of evaporator temp, sensor and chassis ground.

Specification: Approx. infinity ohms

Fig. 80: Checking Resistance Between Terminal "1" Of Evaporator Temp, Sensor And

2008 Kia Sedona EX

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

Microsoft

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

Page 73

© 2006 Mitchell Repair Information Company, LLC.