DTC P1441: EVAP System Flow During Non-Purge: Description

This DTC tests for undesired intake manifold vacuum flow to the Evaporative Emission (EVAP) system. The control module seals the EVAP system by commanding EVAP canister purge valve off and EVAP canister vent valve on. The control module monitors the Fuel Tank Pressure (FTP) sensor to determine if a vacuum is being drawn on the EVAP system. If vacuum in EVAP system is more than a predetermined value within a predetermined time, DTC will set.