The Intake Air Temperature (IAT) Sensors are thermistor devices in which resistance changes with temperature. The electrical resistance of a thermistor decreases as the temperature increases, and increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signals to the PCM corresponding to temperature.
Removal & Installation
- Turn the ignition switch to the OFF position.
Remove the retainers and air deflector.
- Remove the power steering reservoir bracket retainers.
- Remove the power steering fluid indicator and retainers. Remove the power steering reservoir bracket. Install the power steering indicator and position aside.
- Disconnect the coolant hoses from the air cleaner outlet pipe.
Loosen the clamps and remove the air cleaner outlet pipe.
NOTEIf there is any oil residue, clean both connecting ports and the inside surface of the charge air cooler pipe to prevent the pipe from blowing off.
- Loosen the clamps and remove the charge air cooler (CAC) pipe.
- Disconnect Intake Air Temperature (IAT) sensor electrical connector.
- Remove the IAT sensor.
- Installation is the reverse order of removal. Tighten the IAT sensor to 13 ft. lbs. (17 Nm).
Inspect the air cleaner and inlet duct. Check all engine vacuum hoses for damage, leaks, cracks, kinks and proper routing. Check Electronic Control (EC) system wiring harness for proper connections, bent or broken pins, corrosion, loose wires and proper routing. Check the powertrain control module (PCM), sensors, and actuators for physical damage.
Basic circuit checks help to minimize pinpoint test steps by providing a procedure to diagnose harness faults associated with the Electronic Engine Control (EC) System: