GM Camaro/Firebird 1993-1998 Repair Guide

Intake Air Temperature (IAT) Sensor

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OPERATION



The IAT sensor is a thermistor which supplies intake air temperature information to the PCM. The sensor produces high resistance at low temperatures and low resistance at high temperatures. The PCM 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. The IAT is located in or near the air intake duct.

See Figure 1



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Fig. Fig. 1: Intake Air Temperature (IAT) sensor (1) and connector (2)

TESTING



See Figure 2

  1. Remove the Intake Air Temperature (IAT) sensor from the vehicle.
  2.  
  3. Connect a digital ohmmeter to the two terminals of the sensor.
  4.  
  5. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the ambient air. Refer to the temperature vs. resistance chart.
  6.  
  7. Repeat the test at two other temperature points, heating or cooling the air as necessary with a hair dryer or other suitable tool.
  8.  
  9. If the sensor does not meet specifications, it must be replaced.
  10.  

REMOVAL & INSTALLATION



See Figures 3, 4, 5, 6 and 7

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the sensor electrical connector locking tab and/or unplug detach the connector.
  4.  



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Fig. Fig. 2: Detach the IAT sensor electrical connector-1996 3.8L engine shown



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Fig. Fig. 3: Unplug the IAT sensor connector ...



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Fig. Fig. 4: ... then carefully remove the IAT sensor by pulling it out of the air duct

  1. If equipped, unfasten the retaining clamp.
  2.  
  3. Carefully remove the sensor.
  4.  



Click image to see an enlarged view

Fig. Fig. 5: On some models, the IAT sensor may be located on the air intake hose



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Fig. Fig. 6: On the 3.8L engine, the IAT sensor is mounted in the air intake resonator



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Fig. Fig. 7: On the 1998 5.7L engine, the IAT sensor (2) is mounted on the intake air duct

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

 
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