Circuit/System Verification

IMPORTANT: Determine the ambient temperature by using an accurate thermometer.

If the ignition has been OFF for 8 hours or greater, the IAT, the IAT 2 and the engine coolant temperature (ECT) should be within 9°C (16°F) of each other and also the ambient temperature. Ignition ON, observe the scan tool IAT Sensor, IAT 2 Sensor and the ECT Sensor parameters. Compare those sensor parameters to each other and also to the ambient temperature to determine if the condition is current.
Engine running, observe the scan tool IAT Sensor parameter. The reading should be between -39 to +120°C (-38 to +248°F) depending on the current ambient temperature and the vehicle operating conditions.
Engine running, observe the scan tool IAT Sensor 2 parameter. The reading should be between -39 to +140°C (-38 to +284°F) depending on the current ambient temperature and the vehicle operating conditions.