Conditions for Running the DTC
WARNING: This page is about a different car, the 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
- Before the engine control module (ECM) can report DTC P0446 failed, DTC P0452 and P0453 must run and pass.
- DTCs P0101, P0102, P0103, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0221, P0222, P0223, P0443, P0449, P0451, P0452, P0453, P0458, P0459, P0496, P0498, P0499, P0560, P0562, P0563, P0700, P2122, P2123, P2127, P2128, and P2138, are not set.
- The ignition 1 voltage is between 10.5-18 volts.
- The fuel system is operating in closed loop.
- The engine is idling.
- The ambient air temperature (AAT) is between 2-32° C (36-90° F).
- The start-up engine coolant temperature (ECT) is within 10° C (50° F) of AAT.
- The fuel tank pressure (FTP) is between -18.7 and +7.5 mm Hg (-10 and +4 in H2O).
- The volumetric efficiency is less than 35 percent.
- The barometric pressure (BARO) is more than 68 kPa.
- The fuel level is between 12-88 percent.
- The vehicle speed sensor (VSS) is less than 2 km/h (3 mph).
- The engine is operating for more than 16 minutes or the long term fuel is stable.
- DTC P0446 runs once an ignition cycle. The ECM will attempt to run this diagnostic up to 10 times an ignition cycle.