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Pesky P0441, P0455

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by lampriusII, Oct 27, 2024.

  1. lampriusII

    lampriusII New Member

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    Cleveland, OH
    Vehicle:
    2007 Prius
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    N/A
    I've done plenty of research on these forums about EVAP and the woes this generation has. I was wondering if anyone had encountered these two together, P0441 Evap Emission Control System Incorrect Purge Flow and P0455 Evap Emission Control System Leak Detected (Gross Large Leak).

    I'm most curious about the data Techstream is reading out, and was curious if anyone had a diagnosis based on these values. Clogged Purge line? VSV for CCV bad?

    Everything on the list passed besides:
    - Purge VSV Opened (Value -0.308 kPa)
    - Gross Leak (Value -0.308 kPa)

    I have swapped gas caps, Purge VSV in the engine bay, charcoal vapor canister, test Purge Flow Switching valve that is mounted near the canister (tested with audible clicks and airflow with air being blown through), new hoses in the engine bay for Purge VSV and verified no visible cracks going back.

    Any help or experience would be helpful! Even if you run the EVAP test on your perfectly working car, i'd love to see what values are actually normal.
     

    Attached Files:

    #1 lampriusII, Oct 27, 2024
  2. bisco

    bisco cookie crumbler

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    the service manual is available at techinfo.toyota.com
     
    #2 bisco, Oct 27, 2024
  3. Tombukt2

    Tombukt2 Senior Member

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    I would think with a vehicle this old that these service manuals should be shared all over the internet just because that's how it used to be I don't know when and where at all changed and who got sued for what or how but. But it kinda sad.
     
    #3 Tombukt2, Oct 27, 2024
  4. rjparker

    rjparker Tu Humilde Sirviente

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    From earlier Priuschat posts:

    Page 214 P0441
    Page 266 P0455

    The trick is to use Google outside of Priuschat
     

    Attached Files:

    #4 rjparker, Oct 27, 2024
  5. mr_guy_mann

    mr_guy_mann Senior Member

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    What year Prius? 2004-2005 is a different system from 2006-2009. (It looks like 2006-2009 but would like to confirm).

    Posted via the PriusChat mobile app.
     
    #5 mr_guy_mann, Oct 28, 2024
  6. lampriusII

    lampriusII New Member

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    Location:
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    2007 Prius
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    N/A
    Fair point! it's an 2007, thanks for the manual links, i've already secured a full copy of the FSM
     
    #6 lampriusII, Oct 28, 2024
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