Circuit Description

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

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, whenever the EVAP system is in purge mode. Fuel vapors can be purged at anytime the ECM is in Closed Loop and the vehicle is not in a decel. The ECM 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, ECM 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.