P0111

P0111 - Intake Air Temperature Sensor Circuit Range






General Description
The intake air temperature sensor (IATS) uses a thermistor whose reistance changes with 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 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 the 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.

DTC Description
The purpose of this diagnosis is to detect a stuck air temperature signal. The diagnostic function checks whether after a variation of the calculated air temperature also a variation of the measured air temperature is detected. ECM sets DTC P0111 when the variation of measured intake air temperature is smaller than threshold while variation of calculated intake air temperature by ECM is greater than threshold.


Detecting Condition and Specifications





Wiring Schematic





Signal Waveform