Join Date: Jul 2007
Location: Clearwater, Florida
P0441 Evaporative Emission Control System Incorrect Purge Flow
Can someone explain to me what this is, if its major/expensive to fix?? I looked up what a purge valve was and this is what I got, I'd like to think i know alot about cars but i dont so I dont get everything in the description. I still have no idea where this part is or how bad this problem is but its causing my CEL light to be on all the time now. PO441 is the only code I got with the key trick so i know this has got to be causing the CEL light to stay on.
EVAP System Description:
In this Evaporative Emission (EVAP) Control System, purge flow occurs during non-closed throttle Conditions. Purge volume is related to air intake volume. Under normal purge Conditions (non-closed throttle), the EVAP canister purge volume control solenoid valve is open to admit purge flow. Purge flow exposes the EVAP control system pressure sensor to intake manifold vacuum.
This system controls flow rate of fuel vapor from the EVAP canister. The opening of the vapor by-pass passage in the EVAP canister purge control solenoid valve changes to control the flow rate. The EVAP canister purge control solenoid valve repeats ON/OFF operation according to the signal sent from the ECM. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is determined by considering various engine conditions. When the engine is operating, the flow rate of fuel vapor from the EVAP canister is regulated as the air flow changes.
The EVAP canister purge control solenoid valve uses a ON/OFF duty to control the flow rate of fuel vapor from the EVAP canister. The EVAP canister purge control solenoid valve is moved by ON/OFF pulses from the ECM. The longer the ON pulse, the greater the amount of fuel vapor that will flow through the valve.
Last edited by I275westcoastflorida; 09-10-2007 at 09:07 PM.