Conditions for Running the DTC

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0335, P0336, P0340, P0341 are not set.
The engine speed is less than 1,500 RPM.
The diagnostic runs 24 times per engine revolution when the above conditions are met.