DTC P0112-00: Intake Air Temperature Sensor1 Circuit Low Input: General Description

The Intake Air Temperature Sensor (IATS) is installed into the Manifold Absolute Pressure Sensor (IATS). 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 5 V power source in the ECM/PCM is supplied to the IATS via a resistor in the ECM/PCM. That is, the resistor in the ECM/PCM and the thermistor in the IATS are connected in series. When the resistance value of the thermistor in IATS changes according to the intake air temperature, the signal voltage also changes. Using this signal, the information of the intake air temperature, the ECM/PCM corrects basic fuel injection duration and ignition timing.