DTC P0112: Intake Air Temperature Sensor 1 Circuit Low Input: General Description

The Intake Air Temperature Sensor (IATS) is part of the Manifold Absolute Pressure Sensor (MAPS). The IATS uses a thermistor whose resistance changes with the temperature. The electrical resistance of the IATS decreases as the temperature increases, and increases as the temperature decreases. The IATS is supplied with a 5V power source via a resistor in the ECM/PCM. The resistor in the ECM/PCM and the thermistor in the IATS are connected in series. When the resistance value of the thermistor in the IATS changes according to the intake air temperature, the signal voltage also changes. Using this signal and the information from the intake air temperature sensor, the ECM/PCM corrects basic fuel injection duration and ignition timing.