Nissan 240SX/Altima 1993-1998 Repair Guide

Intake Air Temperature Sensor

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See Figure 1

OPERATION



The Intake Air Temperature (IAT) sensor resistance changes in response to ambient air temperature. Sensor resistance decreases as the air temperature increases, and resistance increases as the temperature decreases. This provides a signal to the ECM, indicating the temperature of the incoming air charge.

TESTING



  1. Disconnect the electrical harness from the IAT sensor.
  2.  
  3. Measure the resistance between the sensor terminals.
  4.  
  5. Compare the resistance reading with the accompanying chart.
  6.  
  7. If the resistance is not within specification, the IAT sensor may be faulty.
  8.  
  9. Connect the electrical harness to the sensor.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: Intake Air Temperature Sensor

REMOVAL & INSTALLATION



The intake air temperature sensor is located in the air cleaner housing.

  1. Disconnect the electrical harness from the IAT sensor.
  2.  
  3. Remove the sensor mounting screws.
  4.  
  5. Remove the sensor from the air cleaner housing.
  6.  

To install:
  1. Install the sensor in the air cleaner housing and tighten the screws securely.
  2.  
  3. Connect the electrical harness to the IAT sensor.
  4.  

 
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