Set Condition
- Once the vehicle is soaked for a calibrated engine off time and then driven over calibrated speed and load conditions for a calibrated time, the Powertrain Control Module (PCM) compares the Ambient Air Temperature (AAT) Sensor, Engine Coolant Temperature (ECT), and Intake Air Temperature (IAT) sensor values. If the values of all the three sensors are more than 15°C (27°F) apart, the general temperature sensor rationality test fails.