Conditions required to set DTC are:

No ECT or IAT DTCs are set.
Vehicle speed greater than 5 MPH.
IAT greater than 50°F (10°C).
ECT greater than 32°F (0°C).
Start-up ECT less than 70°F (21°C).
Closed loop operation temperature of 68°F (20°C) not reached within 2 minutes of start-up.