The Intake Air Temperature (IAT) sensor is the same as the Manifold Air Temperature (MAT) sensor on earlier models.
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 Figures 1, 2 and 3
- If necessary, remove the Intake Air Temperature (IAT) sensor from the vehicle.
- Connect a digital ohmmeter to the two terminals of the sensor.
- Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the ambient air. Refer to the temperature vs. resistance chart.
- Repeat the test at two other temperature points, heating or cooling the air as necessary with a hair dryer or other suitable tool.
- If the sensor does not meet specifications, it must be replaced.
REMOVAL & INSTALLATION
See Figures 4 and 5
- Disconnect the negative battery cable.
- If necessary, remove the air intake cover and filter element.
- Detach the IAT sensor electrical connector.
- Grasp and remove the IAT sensor using a twisting and pulling motion.
- Position and insert the IAT sensor into the rear air intake duct or air cleaner housing assembly.
- Attach the sensor electrical connector.
- If removed, install the air intake cover and filter element.
- Connect the negative battery cable.