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junebabi06
New User
Apr 20, 2009, 5:59 PM
Post #1 of 2
(7757 views)
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2001 Toyota Echo 4 cyl 85123 miles. check engine lights on and had checked at auto zone and was given code P0441. Need help to diagnose exactly what to do and how to fix the problem. Is this something serious or minor?Yes i'm a woman trying to fix this myself, so as much details will help considerably.
(This post was edited by junebabi06 on Apr 20, 2009, 6:02 PM)
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DanD
Veteran
/ Moderator
Apr 21, 2009, 3:04 AM
Post #2 of 2
(7736 views)
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This code deals with the evaporative emissions system (EVAP); in other words gasoline fumes from the fuel tank and fuel tank ventilation system.
The system is designed to contain fuel tank & fuel system fumes; until it can drawn into the engine to be burnt.
Code P0441 will set if a leak in the system is detected or if there is a malfunction with the solenoid valves or the vapor pressure sensor, causing the computer to think there’s a leak.
On your own all you can do are visual inspections; after that you will need some specific test equipment.
As in a Bi-directional scan tool that is capable of commanding the computer to open or seal the system; along with monitoring the computer’s interpretation of the pressure sensor’s input.
A digital multi-meter for testing resistance values of the solenoids and wiring harness. Then there’s a machine called an EVAP/smoke machine that at times is the only way of finding the leak. It does just what its name says; it generates smoke that can be introduced into the system at a relatively low pressure.
A leak coming from as small of a hole as .020” of an inch (a pin hole) is enough to trigger a code and set the warning light. There is no way of seeing that small of a gasoline vapor leak (its clear) without the aid of a smoke machine.
Things you can check for are whether the gas cap is/was installed properly and that it wasn’t left loose.
Check the rubber seal of the gas cap, for any tears, cuts or if it has become deformed. If you are going to replace the cap, make sure it is the proper one for this vehicle; buy OE (original equipment).
Check the fuel tank filler neck and the area where the gas cap would seal against it for any foreran material, rust or cracks, that would prevent the cap from sealing.
Check under the hood, the carbon canister and then the fuel tank area; for any of the small hoses (vacuum lines) that may have come off or split; I know that this is pretty vague but how do I tell you (from here) which hoses are part of the EVAP system?
This code will not leave you broke down; but it could affect fuel mileage and possibly stop it from passing an emissions inspection.
Dan.
Canadian "EH"
(This post was edited by DanD on Apr 21, 2009, 3:09 AM)
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