Conditions for Running the DTC

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

Before the PCM can report that DTC P0171 or P0174 failed, DTC P0442 must run and pass.
DTCs P0030, P0050, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0135, P0155, P0300-P0306, P0335, P0339, P0401, P0404, P0442, P0443, P0496, P1128, P1129, P2227, P2228, P2229, P2413, P2414, and P2415 are not set.
Engine coolant temperature (ECT) is more than 69°C (156°F).
Intake air temperature (IAT) is at least 0°C (32°F).
Manifold absolute pressure (MAP) is at least 24 kPa.
Engine speed is between 630-4,000 RPM.
The engine is operating in Closed Loop.
The evaporative emission (EVAP) monitor is not running.
DTC P0171 and DTC P0174 run once per drive cycle when the above conditions are met.