Nissan Maxima 1993-1998 Repair Guide

Intake Air Temperature Sensor

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OPERATION



See Figure 1



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Fig. Fig. 1: The intake air temperature sensor is located in the air intake duct

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



See Figures 2 and 3



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Fig. Fig. 2: Using hot water to check intake air temperature sensor function

  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. 3: Compare the sensor readings with these values

REMOVAL & INSTALLATION



  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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