Conditions For Running DTC

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0137, P0138, or P0140 are not set.
The difference between ECT at last key OFF and the current key ON indicates a cold start.
System voltage is 10-18 volts.
Average mass airflow is less than 30 g/s.