Toyota Celica, Corolla, ECHO & MR2 1999-05

Intake Air Temperature (IAT) Sensor

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Operation



The IAT sensor is located in the air cleaner housing. The IAT sensor advises the ECM of changes in intake air temperature (and therefore air density). As air temperature of the intake varies, the ECM, by monitoring the voltage change, adjusts the amount of fuel injection according to the air temperature.

Removal & Installation





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Fig. View of the Intake Air Temperature (IAT) sensor

Disconnect the wiring from the IAT sensor. Test the sensor using an ohmmeter. If the testing is not within specifications, grasp the sensor and replace as necessary. Inspect the sensor grommet and replace if deteriorated. Insert a new sensor and attach the wiring.

Testing



  1. Remove the IAT sensor.
  2.  
  3. Using an ohmmeter, measure the resistance between the terminals. Refer to the graph.
  4.  



Click image to see an enlarged view

Fig. Intake Air Temperature (IAT) sensor specifications

  1. If the resistance is not within specifications, replace the sensor.
  2.  
  3. Install the sensor.
  4.  

5S-FE VIN G
  1. Using an ohmmeter, measure the resistance between the terminals.
  2.  
  3. If the resistance is not as specified, replace the sensor.

    Click image to see an enlarged view

    Fig. Testing the IAT sensor

  4.  

 
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