Subaru Forester 1998-05

Intake Air Temperature (IAT) Sensor

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Operation



The sensor provides a signal to the ECM for incoming air temperature. This information is used to adjust the injector pulse width and in turn the air/fuel ratio.

Removal & Installation



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

To install:

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

Testing



  1. Start the engine and allow it to reach operating temperature.
  2.  
  3. Using the Subaru scan tool, read the sensor signal data. If the measured value is less than -40 degrees F, replace the sensor.
  4.  

 
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