An advanced scan tool is another tool used in the diagnosis of the P0446 code. P0446 can caused by many different components so care must be taken to test all of these properly to avoid misdiagnosis. P0446 seems to be something related to an evac canister by the fuel tank. You should also check that the spark plug gap is set properly. Hopefully the new filter design keeps that from happening again. If the fuel tank pressure sensor does not respond to pressure or vacuum , inspect the ground circuit for an open.
If your are for a different car, select that vehicle series before searching for the diagnostic codes because not all used by one manufacture are used by the other makes. These scan tools do much more than just check for codes and clear them. A similar test can be done for the pressure side of the sensor operation by applying pressure with the J 41413-200 while taking a snapshot. I haven't really bothered to fix it because the truck runs and drives fine, but since I just failed my inspection I reckon it's time to do something about it. Is the evaportive canister alot of money? I guess the dust and gas from overfilling turned to mud and clogged it up.
Often this is caused by your gas cap not being properly tightened. When the engine cold the purge valve remains closed. If the check engine light doesn't turn off you will need to go to a repair shop who can scan and troubleshoot the problem. That's the problem with guessing. The other half just end up needing a new purge solenoid. Not all garages will do them.
The length of the test can be up to 40 minutes. Did you find and correct the condition? YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Posted on Jan 30, 2010 www. Continue driving and see if the check engine light turns off. Pull over, retighten it, and take a look at the cap to see if it has any cracks in it. When pressure is applied to the system and released, a properly operating system will return to the atmospheric pressure rapidly.
The ability to seal the vent is necessary for the on board diagnosis of other evaporative emission control system components. Hi, I have a 1999 Yukon Denali 5. Raise and suitably support the vehicle. The information contained on this site is presented for informational purposes only. Disconnect the canister vent valve hose.
Did you find and correct the condition? H2O to the vacuum shown on the scan tool from the Fuel Tank Pressure sensor while the system is sealed. It whines like hell but it doesn't seem to be getting any worse, so that makes me think it's a vacuum leak. These can range from a faulty spark plug lead, shorted kill switch or flywheel key damage. I replaced my vent valve solenoid and purge valve still have po446. Before using this signal as an atmospheric reference, it must first be re-zeroed. Basically the problem is, the evap purge vent valve gets clogged with dirt, especially if the truck is used in dirty conditions.
The scan tool displays a message when the service bay test does not run. Refer to link for specifics or search using that format I suggested. This solenoid valve is used only for diagnosis, and usually remains opened. Will replacing the vent valve solenoid most likely solve my problem? Give it a try, worse case you buy a new solenoid the one you have isn't working anyway. Did you find and correct the condition? Evap vent valve is usually supplied Batt. The Fuel Tank Pressure sensor monitors a range from 7.
If the code was cleared and came back, you need to do a little in-depth diagnosis to figure out what's going on. Before running out and spending money on this issue be sure the gas cap is in good condition and make sure it's tight. Here it is: 1 find the location of the vent valve; its under the truck, locate the charcoal canister on the front of the gas tank and trace the vent line to the vent valve. If the vent system cannot bleed off pressure fast enough, this code can set. The currently selected is for the Pontiac makes. If your spark plugs look good, problems with your ignition system can also preventing a spark. Dec 19, 2015 Quick fix for code p0446 evap emissions vent circuit low.
I have looked everywhere under the truck and cannot find the evap canister, vent solenoid or anything that resembles them. Then later it says the canister or hoses are the most likely cause. Does the vehicle pass the Service Bay Test? As the title says: some might have an ses p0446, evap emissions vent circuit low. I made sure I put as much info in here as I could. Posted on Jun 23, 2010 Generally in google search type obd2 then po446 or whatever and an obd2 site will come up w specifics for that code. It was the evaportive canister.