The Intake Air Temperature (IAT) sensor determines the air temperature inside the intake manifold. Resistance changes in response to the ambient air temperature. The sensor has a negative temperature coefficient. As the temperature of the sensor rises the resistance across the sensor decreases. This provides a signal to the PCM indicating the temperature of the incoming air charge. This sensor helps the PCM to determine spark timing and air/fuel ratio. Information from this sensor is added to the pressure sensor information to calculate the air mass being sent to the cylinders. The IAT is a two wire sensor, a 5-volt reference signal is sent to the sensor and the signal return is based upon the change in the measured resistance due to temperature.
Removal & Installation
6.0L Diesel Engine
- Turn the ignition switch to the OFF position.
- Disconnect the intake air temperature 2 (IAT2) electrical connector and wiring harness retainer.
- Remove the IAT2 sensor.
To install, reverse the removal procedure and note the following:
- Tighten air intake temperature sensor to 13 ft. lbs. (18 Nm).
- Turn the ignition switch OFF.
- Disconnect the wiring harness from the IAT sensor.
- Measure the resistance between the sensor terminals.
- Compare the resistance reading with the accompanying chart.
- If the resistance is not within specification, the IAT may be faulty.
- Connect the wiring harness to the sensor.