Conditions for Running the DTC (w/LLT)

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

Before the ECM can report DTC P2270 or P2272 failed, DTCs P0036, P0037, P0038, P0056, P0057, P0058, P0137, P0138, P0140, P0141, P0157, P0158, P0160, P0161, P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, P0393, P0443, P0458, and P0459 must run and pass.
DTC P0461, P0462, P0463, P2066, P2067, or P2068 is not set.
The engine is operating.
The ignition voltage is greater than 10 volts.
The rear HO2S are at operating temperature for greater than 10 seconds.
The long term fuel control is enabled.
The mass air flow (MAF) sensor is greater than 10 g/s.
The MAF sensor is between 6-33 g/s for greater than 3 seconds during the intrusive test.
DTC P2270 and P2272 run continuously once the above conditions are met for approximately 10 minutes when the fuel level is greater than 12 percent.
DTC P2270 and P2272 run continuously once the above conditions are met for approximately 20 minutes when the fuel level is less 12 percent.