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p0446 code, what do I check first?

Discussion in '1st Gen. Tacomas (1995-2004)' started by Inverno4, Mar 13, 2012.

  1. Mar 13, 2012 at 11:53 AM
    #1
    Inverno4

    Inverno4 [OP] Well-Known Member

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    My check engine light came on this morning and when I got the code read, Autozone said it was p0446 (twice now) and p0441 pending. Should I check the gas cap first to make sure its not defective? The truck has 155k on the original. What are next to look for?
     
  2. Mar 13, 2012 at 11:54 AM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Yes, check the gas cap first. Then I'd look at the VSVs.
     
  3. Mar 13, 2012 at 11:55 AM
    #3
    Inverno4

    Inverno4 [OP] Well-Known Member

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    They are located under the hood on the right, correct? I think I've seen them before, mine is green.
     
  4. Mar 13, 2012 at 12:48 PM
    #4
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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  5. Mar 15, 2012 at 3:41 AM
    #5
    Inverno4

    Inverno4 [OP] Well-Known Member

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  6. Mar 15, 2012 at 6:01 AM
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    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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  7. Mar 15, 2012 at 9:20 AM
    #7
    Inverno4

    Inverno4 [OP] Well-Known Member

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    I've noticed lately that the gas pump shuts off every couple gallons when I fill up, that never happened before. Could that be part of this problem? Got the new cap, gotta reset the code and cross my fingers.
     
  8. Mar 15, 2012 at 9:27 AM
    #8
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Yes, the premature shut off is likely the result of this. There is too much pressure in your tank. With that being said, if it were my truck I would look at the VSV next to the tank. You can test them with the battery voltage. By activating the coil with the voltage, you should feel them switch. If not, you can hook a small hose up to one of the ports and try blowing through it. The state should change with voltage added.
     
  9. Mar 15, 2012 at 9:41 AM
    #9
    Inverno4

    Inverno4 [OP] Well-Known Member

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    Is that part replaceable without changing out the canister? I'm going to test the voltage this weekend. Hopefully this is it.
     
  10. Mar 15, 2012 at 9:49 AM
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    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    I believe so.
     
  11. Mar 15, 2012 at 9:50 AM
    #11
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Is yours under the hood or next to the tank?
     
  12. Mar 15, 2012 at 11:07 AM
    #12
    Inverno4

    Inverno4 [OP] Well-Known Member

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    The VSV for EVAP and VSV for CCV are under the hood. I believe there is another VSV on the canister.
     
  13. Mar 15, 2012 at 11:09 AM
    #13
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    I wasn't sure if you canister was under the hood too. Some were, some were not. But yes, it maybe be on the canister but you will be able to remove it from the canister.
     
  14. Mar 15, 2012 at 4:45 PM
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    Inverno4

    Inverno4 [OP] Well-Known Member

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    The dealer told me that I could not buy the VSV by the canister without buying the whole thing for $300+! I've found it on Toyota OEM sites online. Do you know of any step by step instructions of replacing the valve?
     
  15. Mar 15, 2012 at 7:24 PM
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    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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  16. Mar 15, 2012 at 7:25 PM
    #16
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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  17. Mar 17, 2012 at 8:36 AM
    #17
    Inverno4

    Inverno4 [OP] Well-Known Member

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    I checked the two VSVs under the hood, they seemed to be working fine. The switch would open and close when I put 9v across them. The canister one didn't click loudly like the others, though I heard a faint sound. Does it sound like it may be bad? It wasn't as audible as the other two. The VSV link said not compatible with Tacomas?
     
  18. Mar 17, 2012 at 8:53 AM
    #18
    Yamaha Dave

    Yamaha Dave Well-Known Member

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    ^That particular code is more than likely related to the charcoal canister. P0446 is considered a "small" leak in the fuel system, and there is piece on the canister that is faulty by design that fails. It's not the canister that goes bad, but a small plastic piece that cracks and creates the leak that is not replaceable as it's molded into the design of the canister. A new charcoal canister cost around $300 to replace, but it should affect not your driveability or reliability at all, just the annoying orange check light is what you'll have to live with. Considering how many have failed and the exact nature in how they failed, it is beyond me on why Toyota hasn't addressed this issue.
     
  19. Mar 21, 2012 at 3:28 AM
    #19
    Inverno4

    Inverno4 [OP] Well-Known Member

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    The CEL was gone for about 5 days but came on this morning on the way to work. Do you think I should change out the VSV for pressure switching first, since its the cheapest? Or just buy the canister?
     
  20. Mar 28, 2012 at 4:07 PM
    #20
    Inverno4

    Inverno4 [OP] Well-Known Member

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    I ended up taking out the VSV on the canister and it was bad...no clicking when applying a voltage. Got a new one from a junkyard (with a canister), working great now.
     
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