Chrysler
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    IAT Sensor Circuit Fault Conditions
Cause:
    Key on for 60 seconds or right after startup, then the test started and the PCM detected an IAT sensor input of 4.6v or less than 0.2v for 4 seconds.

Generic
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    Intake Air Temperature Sensor 1 Circuit

GM
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    IAT Sensor Circuit Conditions
Cause:
    Key on or engine running, then the PCM detected the IAT sensor input was -40°F, or that the IAT input was 284°F, either for 500 ms.