Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection

Scan Tool Diagnosis
The scan tool displays temperature of the air entering the engine, which should read close to ambient air temperature when engine is cold. The temperature should rise as underhood temperature increases. If the engine has not been run for several hours (overnight) the Intake Air Temperature (IAT) sensor temperature and engine coolant temperature should read close to each other.

IAT Sensor Circuit Malfunctions
If the PCM detects a malfunction in the IAT sensor circuit, the following Diagnostic Trouble Codes (DTCs) will set:

^ DTC P0112 circuit low. Testing and Inspection

^ DTC P0113 circuit high. Testing and Inspection

^ DTC P1111 circuit intermittent high. Testing and Inspection

^ DTC P1112 circuit intermittent low. Testing and Inspection