Kia_Sephia_Rio_Spectra_Optima_1998-2006

Intake Air Temperature (IAT) Sensor

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Location



The MAF is mounted in the intake air hose of the air cleaner assembly. On some vehicles this sensor is combined with the IAT sensor.

Operation



This sensor is a resistor based sensor which detects the intake air temperature. According to the intake air temperature reading the ECM will control the necessary amount of fuel injection.

Removal & Installation



  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the connector from the sensor.
  4.  
  5. Remove the sensor retaining screws, as required.
  6.  
  7. Remove the air cleaner and air intake assembly, as required.
  8.  
  9. Remove the sensor from its mounting.
  10.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  

Operation



This sensor is a resistor based sensor which detects the intake air temperature. According to the intake air temperature reading the ECM will control the necessary amount of fuel injection.

Removal & Installation



  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the connector from the sensor.
  4.  
  5. Remove the sensor retaining screws.
  6.  
  7. Remove the sensor from its mounting.
  8.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  

Operation



This sensor is a resistor based sensor which detects the intake air temperature. According to the intake air temperature reading the ECM/PCM will control the necessary amount of fuel injection.

Removal & Installation



  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the connector from the sensor.
  4.  
  5. Remove the sensor retaining screws, as required.
  6.  
  7. Remove the air cleaner and air intake assembly, as required.
  8.  
  9. Remove the sensor from its mounting.
  10.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  

Testing



  1. Connect a multimeter.
  2.  
  3. Disconnect the connector.
  4.  
  5. Be sure the ignition switch is in the ON position.
  6.  
  7. Measure the voltage between the sensor terminal 1 and 2.
  8.  
  9. On 2001-2003 vehicles, specification should be 2.22-2.82 kohms at 68°F. and 0.29-0.36 kohms at 176°F.
  10.  
  11. On 2004-2006 vehicles equipped with the 2.4L engine, specification should be 2.33-2.97 kohms at 68°F. and 0.31-0.43 kohms at 176°F.
  12.  
  13. On 2004-2006 vehicles equipped with the 2.7L engine, specification should be 2.22-2.82 kohms at 68°F. and 0.30-0.36 kohms at 176°F.
  14.  
  15. Replace the sensor, as required.
  16.  

2001-2002
  1. Connect an ohmmeter.
  2.  
  3. Measure the resistance between sensor connector B11, terminal 1 and 2.
  4.  
  5. Specifications are as follows:

    Temperature - 4°F, resistance 15.04 (plus 1.79, minus 1.60) kohm
     
    Temperature 68°F, resistance 2.45 (plus 0.19, minus 0.18) kohm
     
    Temperature 176°F, resistance 0.318 (plus 0.011, minus 0.011) kohm
     

  6.  
  7. If within specification, check poor terminal contact, bent or misplaced terminal. Correct as required.
  8.  
  9. If not within specification, install a known good sensor and recheck. Replace the sensor, as required.
  10.  

2003-2005
  1. Be sure the ignition switch is OFF.
  2.  
  3. Disconnect the IAT connector. Disconnect the ECM connector.
  4.  
  5. Using an ohmmeter measure the resistance between the IAT sensor signal circuit and the ECTS ground circuit. Specification is infinite.
  6.  
  7. Using an ohmmeter measure the resistance between the IAT sensor harness connector and chassis ground at the IAT sensor signal circuit. Specification is infinite.
  8.  
  9. If within specification, install a known good sensor and recheck. Replace the sensor, as required.
  10.  
  11. If not within specification, check for short circuit between IAT sensor signal circuit and ground circuit. Check for short to ground between IAT sensor harness connector and ECM harness connector. Repair as required.
  12.  

2004-2005
  1. Turn the ignition switch to the OFF position.
  2.  
  3. Disconnect the sensor connector.
  4.  
  5. Using an ohmmeter, measure the resistance between terminals 1 and 5, of the connector.
  6.  
  7. Specifications are as follows:

    Temperature -4°F, resistance 14.26-16.02 ohms
     
    Temperature 32°F, resistance 5.50-6.05 ohms
     
    Temperature 68°F, resistance 2.35-2.54 ohms
     
    Temperature 104°F, resistance 1.11-1.19 ohms
     
    Temperature 140°F, resistance 0.57-0.60 ohms
     
    Temperature 176°F, resistance 0.31-0.32 ohms
     

  8.  
  9. If not, replace the sensor.
  10.  

2006
  1. Be sure the ignition switch is OFF.
  2.  
  3. Disconnect the sensor electrical connector.
  4.  
  5. Measure the resistance between terminal 1 and 5 of the connector (component side).
  6.  
  7. Specifications are as follows:

    Temperature - 4°F, resistance 14.26-16.02 kohm
     
    Temperature 32°F, resistance 5.50-6.05 kohm
     
    Temperature 68°F, resistance 2.35-2.54 kohm
     
    Temperature 176°F, resistance 0.31-0.32 kohm
     

  8.  
  9. If not within specification, install a known good sensor and recheck. Replace the sensor, as required.
  10.  
  11. If within specification, install a known good ECM/PCM and recheck. Replace the component, as required.
  12.  

  1. Turn the ignition switch to the OFF position.
  2.  
  3. Disconnect the sensor connector.
  4.  
  5. Using an ohmmeter, measure the resistance between terminals 1 and 5, of the connector.
  6.  
  7. Specifications are as follows:

    Temperature -4°F, resistance 14.26-16.02 ohms
     
    Temperature 32°F, resistance 5.50-6.05 ohms
     
    Temperature 68°F, resistance 2.35-2.54 ohms
     
    Temperature 104°F, resistance 1.11-1.19 ohms
     
    Temperature 140°F, resistance 0.57-0.60 ohms
     
    Temperature 176°F, resistance 0.31-0.32 ohms
     

  8.  
  9. If not within specification, check for contamination, deterioration or damage. Substitute a known good component. Recheck, and replace the sensor as required.
  10.  
  11. If within specification, check for poor connection between the PCM and the component.
  12.  

 
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