Monday, March 12, 2012

Intake Air Temperature (IAT) Sensor Testing on Ford?

The Intake Air Temperature (IAT) Sensor
OPERATION & TESTING Details are as follows:----

The Intake Air Temperature (IAT) sensor resistance changes in response to the ambient air temperature. The sensor resistance decreases as the air temperature increases. This provides a signal to the PCM indicating the temperature of the incoming air charge.

The 3.0L engine sensor is mounted in the air cleaner-to-throttle body supply tube, while the 3.8L engine sensor is mounted in the air cleaner box.


Fig. Intake air temperature sensor location-3.8L engine

Fig. Intake air temperature sensor location-3.0L engine


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

This details will help.

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