Monitor Description
WARNING: This page is about a different car, the 2025 Toyota Highlander, 2024 Toyota Highlander, and 2023 Toyota Highlander. 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 the sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the intake air temperature sensor circuit, illuminate the MIL and stores a DTC.
Example:
If the intake air temperature sensor output voltage is less than 0.176 V for 0.5 seconds or more, the ECM will illuminate the MIL and store this DTC.