GM Firebird 1982-1992 Repair Guide

Intake Air Temperature (IAT) Sensor

Print

See Figures 1, 2 and 3

OPERATION



The IAT sensor is a thermistor which supplies intake air temperature information to the ECM. The sensor produces high resistance at low temperatures and low resistance at high temperatures. The ECM supplies a 5 volt signal to the sensor and measures the output voltage. The voltage signal will be low when the air is cold and high when the air is hot. On some models, this sensor is also known as the Manifold Air Temperature (MAT) sensor.

REMOVAL & INSTALLATION



  1. Disconnect the negative battery cable.
  2.  
  3. Detach the sensor electrical connector locking tab.
  4.  
  5. Carefully remove the sensor.
  6.  

To install:
  1. Install the sensor.
  2.  
  3. Connect the electrical wiring.
  4.  
  5. Connect the negative battery cable.
  6.  



Click image to see an enlarged view

Fig. Fig. 1: Intake air temperature sensor location on some TBI engines



Click image to see an enlarged view

Fig. Fig. 2: Intake air temperature sensor location on Tuned Port Injection engines



Click image to see an enlarged view

Fig. Fig. 3: On some models, the IAT sensor may be located on the air intake hose

 
label.common.footer.alt.autozoneLogo