DTC P0112: Intake Air Temperature Sensor Circuit Low Input, DTC P0113: Intake Air Temperature Sensor Circuit High Input: Description
WARNING: This page is about a different car, the 2002 Nissan Xterra and 2002 Nissan Frontier. However, it is still accessible from the selected car via links, so may be relevant.
The Intake Air Temperature (IAT) sensor is mounted to the air duct housing. It detects intake air temperature and transmits a signal to the ECM. The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to temperature increase.