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DTC P0446: EVAP Canister Vent Blocked: Description

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

This DTC tests Evaporative (EVAP) emission system for a restricted or blocked EVAP vent path. Powertrain Control Module (PCM) commands EVAP canister purge valve and EVAP canister vent valve on. This allows a vacuum to be applied to the EVAP system. Once a calibrated vacuum level has been reached, the PCM commands EVAP canister purge valve and EVAP canister vent valve off. The PCM monitors Fuel Tank Pressure (FTP) sensor for a decrease in vacuum. If vacuum does not decrease to near zero in. H2O in a calibrated time, DTC P0446 will set.

The table illustrates the relationship between the ON and OFF states, and the OPEN or CLOSED states of the EVAP canister purge and vent valves. See EVAP VALVE LOGIC  table under DTC P0440: EVAP SYSTEM.

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