When Monitored and Set Condition:

When Monitored: Engine off time is greater than 480 minutes. Ambient temperature is greater than 4°C (39°F).

Set Condition: After a calibrated amount of cool down time, the PCM compares the ECT Sensor, IAT Sensor and the Ambient Air Temperature Sensor values. If the IAT Sensor value is not within calibrated temperature amount of the other two temperature sensors an error is detected. Two Trip Fault.