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

The Evaporative Emission (EVAP) system is used to store fuel vapors to reduce the amount of unburned fuel from escaping into the atmosphere. The EVAP purge solenoid is Pulse-Width Modulated (PWM) and is used to control the flow of fuel vapors from the EVAP canister to the intake manifold. The EVAP purge solenoid is commanded ON, PWM, whenever the EVAP system is in purge mode. Fuel vapors can be purged at anytime the PCM is in Closed Loop and the vehicle is not in a decel. The PCM controls the EVAP purge solenoid by controlling an internal driver that pulls the solenoid circuit to ground. During one part of the EVAP diagnostic system test, the PCM will close the EVAP purge solenoid and the EVAP vent solenoid. DTC P1441 sets when the Fuel Tank Pressure (FTP) sensor indicates that the pressure is lower than atmospheric, vacuum, indicating the EVAP purge solenoid is stuck open.