Landcruiser AWD L6-4.5L (1FZ-FE) (1997)
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Intake Air Temperature Sensor: Description and Operation
The intake air temperature sensor is built into the air flow meter and senses the intake air temperature. A thermistor built in the sensor changes the
resistance value according to the intake air temperature. The lower the intake air temperature, the greater the thermistor resistance value and the
higher the intake air temperature, the lower the thermistor resistance value.
The intake air temperature sensor is connected to the ECM. The 5V power source voltage in the ECM is applied to the intake air temperature
sensor from the terminal THA via a resistor R. That is, the resistor R and the intake air temperature sensor are connected in series. When the
resistance value of the intake air temperature sensor changes in accordance with changes in the intake air temperature, the potential at terminal
THA also changes. Based on this signal, the ECM increases the fuel injection volume to improve driveability during cold engine operation.
