Question about Cars & Trucks
Is there someone out there that has or is having same problem. all parts in evap system have been tested and are perfect. no leaks. i have an actron code reader with a drive cycle monitor in it and evap system goes from open to closed but it keeps kicking on that light. these professors say it is a driveability issue and possibly the computer will decide to handle it. i do not want any guesses, i need someone that is familiar with this. thank you.
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Posted on Jan 02, 2017
If your wanting to know what to check. po445 is the purge solenoid control circuit, po447is the evap vent solenoid control circuit.Check the connections, and the wiring for shorts, or replace solenoid. Could also be a failed pcm.
Posted on Mar 10, 2009
A small evap leak is usually a vapor line with a small crack in it or fuel cap seal. The vapor lines usually crack where they meet a plastic or metal line attachment. Where the line has to swell a bit to fit the other line is where the small crack occurs. You can feel each line at these points and find the crack. It will feel smooth all the way around and then a rough spot. Check the lines going to the service port under the hood and then follow them back to the canister looking closely at each connection. If you don't find anything replace the fuel cap and retest. It is rarely any of the other system parts you mentioned. If it goes undetected long enough a new code will come up as P0442 medium evap leak, meaning the crack has become bigger and possibly easier to find. It is strictly emissions and will have no effect on the way the vehicle runs.
Posted on May 18, 2009
I have the same failure that occurred when smogging my Ford Ranger. The EVAP test was just added a couple of years ago and it tests for leaks in the gas tank vapor recovery system. What this is a system of vapor recovery lines that connect from the gas tank and goes to a canister then returns to the intake and on the next engine start and gets used, instead of leaking into the air.
The only issue is these lines can develop a leak at any of the connection points or along the rubber portions and can be a pain to replace depending on your application. So until you fix the leak you will fail this test since they pressurize the system and if there is a leak it won't hold the pressure.
Posted on May 22, 2009
most p0440 codes are related to gas cap problem check cap and reset code if it the problem code pops problem with a fuel line follow lines from filler neck down and under vehicle[ look for smell of gas or cracked line] all the way up to throttle body if have leak fix asap
Posted on Sep 26, 2009
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Evaporative Emissions (EVAP) Vent System Performance
The EVAP system tests run when the engine is first started and meets the Conditions for Running the DTC. An intermittent condition could be caused by a damaged EVAP vent housing, a temporary blockage at the EVAP canister vent inlet, or a pinched vent hose. A blockage in the vent system will also cause a poor fuel fill condition.An EVAP canister, vent hose, or vent solenoid valve that has restricted flow may cause this DTC to set. Using a purge solenoid command with a scan tool will allow vacuum to be applied to the system instead of pressure. With the engine running, the EVAP canister vent solenoid valve open and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than 5 inches H2O.An EVAP canister filter that is restricted can cause this DTC to set. Refer to Evaporative Emission (EVAP) Canister Filter Replacement and Evaporative Emission (EVAP) System Cleaning .Disconnecting one component at a time while the EVAP system is under flow will help to pinpoint a restriction in the system.Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.For intermittent conditions, refer to Intermittent Conditions .
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