DTC P1441: Evaporative Emission System Flow During Non-Purge: Description
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix, 2003 Chevrolet Malibu, and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
This DTC tests for undesired intake manifold vacuum flow to the Evaporative Emission (EVAP) system. The PCM seals the EVAP system by commanding the EVAP canister purge valve Closed and the EVAP canister vent valve Closed. The PCM monitors the Fuel Tank Pressure (FTP) sensor to determine if a vacuum is being drawn on the EVAP system. If vacuum in the EVAP system is more than a predetermined value within a predetermined time, this DTC sets.
The following 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 CANISTER PURGE VALVE/VENT VALVE RELATIONSHIP table.