How To Repair Code P440 ,p441, P446 On Toyota Tacoma

GearHead899 [OP] Member

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Justin

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got a 02 Taco 2.4L thats throwing these codes. I know its some sort of problem with the evap system. Whatever thought what the cause could be?
goomba Information technology is a Fluid Situation

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This is for a starting time gen tacomas yous should post in the 2nd gen tacoma forum.
cory02taco Well-Known Fellow member

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he'southward got an 02 dude. thats a 1st gen. this is probly going to audio stupid, but take y'all checked to make sure your gas cap is tight? sometimes that can throw an evap code. also bank check vac. lines around the engine compartment just to double cheque.
Beluga Member

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EVAP codes. I would first with checking fpr whatsoever vacuum leaks. Oh yeah not to insult you but make certain the fuel tank cap is not loose.
goomba It is a Fluid Situation

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My b. Just looking at his sig.
GearHead899 [OP] Fellow member

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yeah lamentable the sig through yous off lol i did check the gas cap. it was tight only i took it off and put it back on again. this truck threw these codes a while ago. when i replaced the bombardment a few weeks ago it manifestly reset the CEL but it stayed off till yesterday. i must have put a few hundred miles on it before the CEL came dorsum on. Ill cleared the code back out yesterday so i will be checking for vaccuum leaks today and keep you updated. thank you!
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This is the only fourth dimension I promote the method I will propose. Sea foam through the brake booster vacuum line. Await for white fume effectually the intake vacuums and exhaust leaks. Otherwise I would showtime with oxygen sensors since they are the most common culprits.
GearHead899 [OP] Member

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Yeah i dont retrieve its a vaccuum leak simply crusade it idles and so smooth. and if it was the O2 sensor, wouldnt it throw a code for the O2 and not the evap? what about the VSV? iv hear these are a mutual problem on these trucks
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evap codes are such a pain in the ass. i had an o2 and evap codes, replaced b1s2, but the light came back on. theres gotta exist a dtc flow nautical chart somewhere on here right?
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PM me your e-mail accost. I take a PDF file that shows how to diagnose the VSV. I was gonna put information technology up on mega upload and PM you the download link simply Megaupload is down.
tagged. Only got the same codes on my 2002 2.4
P0440
P0441
P0446

Whatever update on this?
zeitgeist films New Member

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I have the same 440 lawmaking. had 440 + 446 before resetting with efi fuse. tarded. best answer. buy or brand an electric motorcar
lets hope we can win this latest electric vehicle battle so we never have to deal with this kind of nonsense again. basically no more of this contrived vehicle "service" economy. some other of granddad'southward failed legacy systems; information technology's all the last 100 years of purposely complicating/manipulating at peoples expense, for their precious profits and economy.
Snow11494 New Member

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I have the same mistake codes for my 02 Tacoma:
P0440
P0441
P0446
I am going to supercede the Vacuum Switching Valve located on the Charcoal Canister, I watched these videos (I was going to replace the whole canister until I watched these):

Part 1: https://www.youtube.com/watch?v=GAzOOWfje9o

Part 2: https://world wide web.youtube.com/picket?five=PDuiopc2ic4&alphabetize=3&listing=PLX_Dy3QSITgg2w3Yx7kpwEuMpk-WVuHeN&t=555s
crazytacoman Well-Known Member

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Any updates on this? I've had the codes for more than than a year at present. Did a fume test, found smoke coming from the filler cervix area, so I replaced the filler neck and the small fuel filler hose. I'g getting these codes again now, so I'one thousand not certain if this is the right solution because the video is for a Sequoia
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for the weekend repair warrior these have a tendancy to be incommunicable to locate and fix as the leaks are so small. If you take a decent browse tool yous can encounter the exact conditions that were nowadays when the CEL was tripped in Freeze Frame Data.
Evaporation codes are what is called 2 trip codes. for the evap monitor(s) to run and examination, the fuel tank HAS to be betwixt 1/4 and iii/4 full, the air temp sensor and h2o temp sensor have to be within 10 degrees (apx) of each other and the vehicle HAS to have sat at least 8 hours and this has to happen twice.

In that location is a recent post where guy had an evap lawmaking and he took it to the dealer and they recommended a fuel tank, he authorized information technology and a few days later on the same code popped. Now, was this a multi trouble issue, probably. I practice not call up the organisation was fume tested subsequently the repair to verify if information technology was stock-still.

A professional fume machine non only creates smoke and pushes it through the system it also monitores pressure level in a very small amount. The parameters for pocket-sized leaks are .030 and large leaks .060, IIRC. You lot might not see smoke from a hole that small but you volition see it isnt holding pressue.

If your state has smog tests the testing facility has a fuel cap tester equally function of the smog motorcar... you might detect a squeamish guy and he will examination your cap for gratuitous or only replace it with a new one. Cheapest and easiest to do.
Snow11494 New Member

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I wish I had an update, mine is yet throwing the same codes, light has been on for nearly 3 years now. I learned how to crook the arrangement for SMOG checks if anyone is interested in that information allow me know.
I have yet to supersede anything other than the Fuel Cap (I'chiliad a cheap donkey and I'm still hopeful for a guaranteed solution)

Those videos I posted are not completely accurate the charcoal canister is dissimilar and they seem to strength you to replace the whole thing, the existent problem is that there are no tutorials specifically nigh my year/model.

This video was my next find, information technology would just be a lot less complicated with a lift (you can skip to around 14:00 for removal of the broken check valve associates and gasket that was causing his leak). Video is for a Toyota 4runner, but its most of the same parts since information technology's an 02:

https://www.youtube.com/watch?5=D-HPp2-_PFM

His receipt (from the video) for reference:

Please update here if y'all end up irresolute any of these parts out, I will do the aforementioned.
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Seeing equally you've had the same codes for iii years already, I call up these aren't important at all and more or less just a waste of coin to go rid of a check engine light. My truck runs very fine and gets me nigh 20mpg, and so I'll probably never attempt fixing it once again . Maybe one of these days when I'k flush with a bit of extra cash, I'll take it to a professional/reputable shop to have information technology fixed once and for all. When that 24-hour interval comes, I'll make certain to update here.
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Sorry to revive an old thread, but I'grand throwing the aforementioned codes. I replaced the gas cap to start, CEL came back. Replaced the entire charcoal canister myself with oem part later on Toyota dealership ran diagnostics and smoke examination and said the canister was leaking, codes are back. Toyota dealership recommends vsv and purge solenoid to exist replaced next to fix the issue.
it'southward been going on for almost a year, merely I tin't pass inspection with the CEL on. Whatever help?
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Get a 9V battery and some exam leads and bank check the 2 VSVs for the evap nether the hood. You can google it only basically take the vsv'southward out and put a lead on each pin and come across if you tin hear it click on. you deceit miss the click. if the VSVs are live, they'll click. once yous know that they are alive, follow the FSM and accident into them with and without the leads connected. this will tell you if they need to be replaced. you can also take some other step and become an Ohm meter or a multimeter and see A) if they have continuity, and B) if they read the correct ohms (~xxx-35 ohms at room temperature). if they are good, i approximate move onto the vsv on the canister, fifty-fifty if its a new piece. eliminate all those equally possibilities. if those are all good, and you checked all your hoses and they are practiced, then i call back you demand to motility onto checking all your gaskets on the fuel tank. this includes the filler neck and roll over valve. check all of this yourself before letting the dealer have you get-go throwing more than parts at it. let us know what yous find.
for the Canister VSV (part number 90910-12250):

For the VSVs under the hood (part #
25860-75230) :

For the other VSV under the hood (part #90910-12245):
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these are the most hard codes to troubleshoot due to the time involved. I practiced affair that is happening is that the evap monitors are running and that is one-half the boxing. I accept attached the vapor pressure sensor diagnostic... this si the device that senses the ascension and fall of vapor force per unit area in the fuel tank which is what is used to set the CEL.
I exercise not know if the country you live in allows for any of the monitors to exist incomplete AND you still be able to pass smog. Evap monitors are notorious for their difficulty to run due to the unique atmospheric condition required to have them offset. If your state allows for 1 monitor to be incomplete and still run the smog test, I would proceed the evap monitor incomplete past keeping the fuel tank full all the time.
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