Honda - Accord Prelude 1996 2000

Intake Air Temperature Sensor

Print

OPERATION





Click image to see an enlarged view

Fig. The tip of the IAT sensor has an exposed thermistor that changes the resistance of the sensor. The resistance decreases at the air temperature increases

The Intake Air Temperature (IAT) Sensor is used by the ECM/PCM to monitor the air temperature inside the intake manifold. The resistance decreases as the air temperature increases. This provides a signal to the ECM/PCM indicating the temperature of the incoming air charge. This sensor helps the ECM/PCM to determine spark timing and the air-to-fuel ratio. Information from this sensor is added to the pressure sensor information to calculate the density of the air mass being sent to the cylinders.

TESTING





Click image to see an enlarged view

Fig. The IAT sensor can be monitored with an appropriate and Data-stream scan tool

  1. Turn the ignition switch OFF .
  2.  
  3. Disconnect the wiring harness from the IAT sensor.
  4.  
  5. Measure the resistance between the sensor terminals.
  6.  
  7. Compare the resistance reading with the accompanying chart.
  8.  
  9. If the resistance is not within specification, the IAT may be faulty.
  10.  
  11. Connect the wiring harness to the sensor.
  12.  



Click image to see an enlarged view

Fig. IAT sensor resistance vs. intake air temperature chart

REMOVAL & INSTALLATION



  1. Disconnect the negative battery cable.
  2.  
  3. Detach the IAT sensor electrical connector.
  4.  
  5. Remove the retaining screws from the sensor (some models may unscrew from the manifold).
  6.  
  7. Remove the IAT sensor from the intake manifold.
  8.  

To install:

  1. Coat the sensor threads with a suitable Teflon® sealant.
  2.  
  3. Install the sensor into the intake manifold.
  4.  
  5. Attach the connectors to the IAT sensor.
  6.  
  7. Connect the negative battery cable.
  8.  

 
label.common.footer.alt.autozoneLogo