DTC P0111-00: Intake Air Temperature Sensor 1 Circuit: General Description

The Intake Air Temperature Sensor (IATS) is installed into the Manifold Absolute Pressure Sensor (MAPS). The IATS uses a thermistor that resistance changes with the temperature. IATS represents Negative Temperature Coefficient (NTC). The electrical resistance of the IATS decreases as the temperature increases, and increases as the temperature decreases. The 5V power source in the ECM is supplied to the IATS via a resistor in the ECM. That is, the resistor in the ECM 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 corrects basic fuel injection duration and ignition timing.