Monitor Description
WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.
The ECM monitors the sensor voltage and uses this value to calculate the intake air temperature. When sensor output voltage deviates from the normal operating range, the ECM interprets this as a fault in the sensor and sets a DTC.
Example:
When the sensor voltage output equal to -40°C (-40°F), or more than 140°C (284°F).