Rio L4-1.6L (2004)
Intake Air Temperature Sensor: Description and Operation
General Description
The Intake Air Temperature Sensor (IATS) is installed into the Mass Air Flow Sensor (MAFS). 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 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.
