Kia Sedona (2008 year). Manual - 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

Page 70 

© 2006 Mitchell Repair Information Company, LLC. 

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

Page 71 

© 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.