Conditions for Running the DTC

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Before the ECM can report DTC P0446 failed, DTCs P0450, P0452, and P0453 must run and pass.
The ambient air temperature (AAT) is between 2-32°C (35-90°F).
The closed loop fuel control is active and the short term/long term fuel trims are stabile
The engine has cycled ON and OFF greater than 6 to 16 times dependent on coolant temperature.
The FTP is between -26.2 and +10.5 mm Hg (-14.0 and +5.6 in. H2O).
The fuel level is between 12-88 percent.
The ECT and the IAT are within 10°C (18°F) of each other at engine start-up.
The barometric pressure (BARO) is greater than 68 kPa.
The ignition voltage is between 10-18 volts.
The fuel system is operating in Closed Loop.
The vehicle speed sensor (VSS) is within 19-100 km/h (12-62 mph).
The conditions above exist for approximately 10 minutes.
DTC P0446 will attempt to run up to 10 times or until the test completes successfully once per ignition cycle.