- This topic has 7 replies, 4 voices, and was last updated 11 years, 11 months ago by
.
-
Topic
-
O.k, I’ve sought help elsewhere for info on how to fix this and have been told several things. Not sure what to make of all this info i dismissed it and decided to just ignore it for the time being until recently. And yes, assuming you read the title i am talking about the dreaded codes. As i am sure there are many codes out there to deal with these ones seems particularly hard to diagnose just from the research i did.
So before i get a little ahead of myself here this is what i am dealing with:
P0440 – Evaporative Emission SystemP0441 – Evaporative Emission System, Incorrect Purge System
P0446 – Evaporative Emission Vent Control Curcuit
As you can see i have 3 codes, these codes are from a ’02 Corolla and from what I’ve read have something to do with the fuel system. Anything from the charcoal canister, purge valve, VSV valve, vacuum hoses, gas cap etc. As you can see i am at loss and not really sure where to even start. I’d really like to fix this but i don’t really wanna throw hundreds of dollars in parts trying different things out. Any help is greatly appreciated in directing me to the probable cause.
-
Replies
-
Yep, all evap system related. I’d just clear it first, if you suspect you didn’t secure the gas cap properly once (that’s all it takes for many of these systems). If it comes back, I’d probably look everything over, if everything seems ok, then I hate to say it, but I’d throw a new gas cap at it. After that probably look at the overall evap system more closely, lines, main filler tube, etc, checking for cracks, rust, etc..
The majority of the system is usually contained directly under the gas tank, under it, or beside it. I’d try to find some service manual pages on it for yours from a toyota forum or the like.
Quick search brings back this(sienna, but testing methodology is sound):
http://www.findonefindall.com/toyota-sienna/toyota_sienna_evap_P0446.htmYou won’t get a definitive answer from asking I’m afraid. The VSV is often the culprit from the short reading I’ve done, but it could be a lot of things. Check for relevant TSB’s as well. Example:
http://www.matrixowners.com/tsb/T-EG051-06.pdfNONE of those codes say gas cap, I feel that would be a waste of time but it’s easy enough to check. Evaporative emissions aren’t really something the DIY can tackle mostly because the majority of the testing that is done needs to be done with a smoke machine. Also having the factory procedure, which it looks like you have some posted above, would be required to find the cause.
That said these videos may help
It’s usually a single specific code, but from the drive-by search I did, any of those can also be due to the cap’s seal, considering the TSB also deals with the filler tube not sealing. Likely not, but after a decent inspection that nothing jumps out at you from, seems good to rule out [to me] as it’s cheap enough.
Assuming a valve or canister issue that isn’t obvious, I’d agree with you(not really DIY friendly), but a decent percentage of these can be pretty obvious assuming you run your hand along them/give a good visual inspection, checking for rust, cracks, etc..
[quote=”Wayne613″ post=36967]It’s usually a single specific code, but from the drive-by search I did, any of those can also be due to the cap’s seal, considering the TSB also deals with the filler tube not sealing. Likely not, but after a decent inspection that nothing jumps out at you from, seems good to rule out [to me] as it’s cheap enough.
Assuming a valve or canister issue that isn’t obvious, I’d agree with you(not really DIY friendly), but a decent percentage of these can be pretty obvious assuming you run your hand along them/give a good visual inspection, checking for rust, cracks, etc..[/quote]
In my opinion without the proper equipment about the best you can do is a good visual and ‘nasal’ inspection. sometimes you can smell a leak but that’s not likely. Those videos I posted are quite good and give a lot of information on this. Evap stuff can be tricky no matter how you slice it.
Thanks for the help everyone including you Eric. Though as helpful as those videos were Eric i think I’m going to take your other advice and get it checked by a professional whenever i have the funds. As of right now the car still operates fine and runs like there’s really nothing wrong, well not that i can visually tell or just by listening. But it’s something I’d rather not leave drag on for to long so I’ll keep ya updated when i find out what the problems were. Thanks again.
- You must be logged in to reply to this topic.