DTC P1441: Evaporative Emission System Vacuum Is Greater Than Predetermined Value ("A" & "B" Series): Description

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