Code P0446 P0441 P0440 and VSC off - Toyota Nation Forum : Toyota Car and Truck Forums
2nd Generation (2000-2004) Specific discussion of the second generation Toyota Avalon

 
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#1 Old 04-15-2007, 09:36 AM
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Code P0446 P0441 P0440 and VSC off

I'm getting these codes on my 2001 Avalon:

P0440 = Evaporative Emission System
P0441 = Evap Emis Sys Incorrect Purge Flow
P0446 = Evap Emis Sys Vent Control Circuit

How do these codes relate to the VSC light staying ON?

Lexus IS300, 04 Sienna LE, 01 Avalon XLS
(sold) 99 Tacoma TRD ---- 86 SR5 Xtra cab, 35's w/8.5" lift
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#2 Old 04-16-2007, 01:39 PM
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Could be as simple as a faulty gas cap gasket. Or a problem with the charcoal canister or VSV in the EVAP control system. Check gas cap issue first, then look for leaking vacuum hoses in this system. The canister is expensive if purchased from Toyota, might look for used parts. Don't overfill the gas tank at fillup.

The VSC light could be a result of the other trouble codes. Clear the other codes first and this issue may also go away (pretty common). FYI, the ECM is programmed to turn the VSC system off it thinks the engineor or trans has a problem in order to minimize power loads on the engine.

A Google search of all 3 codes at once will result in many interesting hits.

Last edited by toyomoho; 04-16-2007 at 01:40 PM.
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#3 Old 04-30-2007, 08:45 AM
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I put on a new OEM gas cap and the codes came up again.

I'll check the other two items as soon as I can.

Lexus IS300, 04 Sienna LE, 01 Avalon XLS
(sold) 99 Tacoma TRD ---- 86 SR5 Xtra cab, 35's w/8.5" lift
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#4 Old 05-01-2007, 02:53 PM
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P0440 is a leak in the emission system, gas tank, etc that is causing the fuel tank to loose air pressure (and allowing the gas vapors to excape).

The link below provides access to a service manual.

http://d01.megashares.com/?d01=badd2e4

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#5 Old 05-15-2007, 04:10 PM
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I live with my VSC on per P0441. I passed smog by driving only 10 or so miles after OBDII reset.

I gave up fix after gas cap, cannister replacement and smoging. Hoses look good and there are solanoids on the firewall that would be next.
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#6 Old 08-12-2007, 08:57 PM
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I FINALLY got around to check the VSV's.

All of them under the hood check out per the shop manual.

I'l have to check the one on the Canister next.

Lexus IS300, 04 Sienna LE, 01 Avalon XLS
(sold) 99 Tacoma TRD ---- 86 SR5 Xtra cab, 35's w/8.5" lift
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#7 Old 08-12-2007, 09:34 PM
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Gen1

My 97 has P0446. Had it diagnosed. One of 2 sensors poss both. Ehe VSV for evap and VSV for VPS which is on canister. Can I get these sensors without the canister? I'm selling the car to move abroad. Help is appreciated.

Thanks,
Steve
** 97 XLS With All The Toys! My Baby! **
** Enjoy & Long Live Your Avalon! **
FOR SALE MOVING! $3400 OR BRO
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#8 Old 08-13-2007, 02:15 PM
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If I order a new Charcol Canister Assy, will it come with a new VSV?

I don't want to end up with an extra VSV.

Lexus IS300, 04 Sienna LE, 01 Avalon XLS
(sold) 99 Tacoma TRD ---- 86 SR5 Xtra cab, 35's w/8.5" lift
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#9 Old 08-13-2007, 08:30 PM
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The VSV for Pressure Switching Valve was toast. I'll be just replacing this part and let you all know if the codes clear.

Lexus IS300, 04 Sienna LE, 01 Avalon XLS
(sold) 99 Tacoma TRD ---- 86 SR5 Xtra cab, 35's w/8.5" lift
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#10 Old 08-09-2010, 06:56 PM
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Quote:
Originally Posted by socalscott View Post
I live with my VSC on per P0441. I passed smog by driving only 10 or so miles after OBDII reset.

I gave up fix after gas cap, cannister replacement and smoging. Hoses look good and there are solanoids on the firewall that would be next.


For P0441 the computer will not throw the code and illuminate the check engine light until it has done an evap test and failed it twice. It will not do an evap test unless there is between 3/4 and 1/4 full gas tank, along with some other conditions. Until it does the test the check engine light will stay off.

Last edited by biff44; 08-10-2010 at 12:08 PM.
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#11 Old 08-13-2010, 08:36 AM
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Quote:
Originally Posted by Nunzie View Post
The VSV for Pressure Switching Valve was toast. I'll be just replacing this part and let you all know if the codes clear.
Forgot to get back to you all. The original soloniod was completely rusted. The new one fixed the problem. It's a lot cheaper to replace the faulty valve than the entire canister assy.

Lexus IS300, 04 Sienna LE, 01 Avalon XLS
(sold) 99 Tacoma TRD ---- 86 SR5 Xtra cab, 35's w/8.5" lift
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#12 Old 08-13-2010, 04:12 PM
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which one did you replace?

Thanks for the follow up. My car just started doing this.

Did you change the one under the car? How hard was it to get to and replace? How expensive were the parts? Need anything in addition to the valve? Maybe hoses or clamps?

Thanks

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#13 Old 08-13-2010, 04:26 PM
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Quote:
Originally Posted by tr7driver View Post
Thanks for the follow up. My car just started doing this.

Did you change the one under the car? How hard was it to get to and replace? How expensive were the parts? Need anything in addition to the valve? Maybe hoses or clamps?

Thanks
I changed the one under the car. It's mounted near the evap. canister (big black box) thats right next to the gas tank. It's very easy to get to, no need to take the evap canister out. Mine was so rusty, that the bracket snapped of when I tried to take it off. I ened you using a tie wrap to hold the new one in place. It's still working today. You should be able to use the existing hoses and clamps.

Your best beat is to take the part out, and bring the part to a parts counter to get the replacment.

When you take the valve out, you will see how bad these rust out. The price was under $30 from Toyota. Toyota parts counters are all over the place with pricing. What cost $3 at one counter can cost you $9 the next town over. I see this everytime I need an OEM Toyota part.

Lexus IS300, 04 Sienna LE, 01 Avalon XLS
(sold) 99 Tacoma TRD ---- 86 SR5 Xtra cab, 35's w/8.5" lift
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