Conditions for Setting the DTC

WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.

The ECM determines the difference between the ECT and IAT at ignition ON is not within 15°C (26°F) of the difference recorded during a previous ignition cycle, when the enable conditions were met.
OR
The ECM determines the IAT at ignition ON is within a calibrated range of the ECT and IAT recorded during a previous ignition cycle, but the ECT is not within 15°C (26°F) of the calibrated range.
The condition exists for more than 4 seconds or cumulative of 50 seconds.