I love my job yesterday!!! EGR Cooler and EGR pipe cleaning

Discussion in 'Gen 3 Prius Main Forum' started by htcmember, Jun 12, 2022.

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  1. htcmember

    htcmember Junior Member

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    At almost 200k miles and i decided to clean it before a check-engine light come up (P0401)

    Look at how dirty it was and shiny that I could clean, work every single minutes of my weekeend

    And i saw that the previous owner does not installed gasket on the end of EGR cooler, Is it a must to install the EGR Cooler gasket?

    I've tried to order it from an nearby autoparts store but it took me by around evening time of Sunday (today) to have it available in store to pick up

    Sir, @Mendel Leisk , do you have idea if it's a must to install it back? Because when I took it apart, I did not see the gasket. Thank you Sir for advises!

    And nice Sunday to you all
    Riley
     

    Attached Files:

    #1 htcmember, Jun 12, 2022
    Last edited: Jun 12, 2022
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  2. xliderider

    xliderider Senior Member

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    How many miles on the odometer? You should have a gasket, and it should be available at Toyota parts department(s).

    Posted via the PriusChat mobile app.
     
    #2 xliderider, Jun 12, 2022
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  3. htcmember

    htcmember Junior Member

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    thanks for your advise, it's almost 200k miles this week. and from when i've took it apart, seem no one touch on this before, it's mostly lucky that it's not blown my head gaskets on my trips :)
     
    #3 htcmember, Jun 12, 2022
  4. ChapmanF

    ChapmanF Senior Member

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    If you had posted the flow numbers from before and after cleaning at that mileage, it would have given us a good data point.

    Had you seen a check-engine light or P0401 yet?
     
    #4 ChapmanF, Jun 12, 2022
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  5. htcmember

    htcmember Junior Member

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    No, i don't have an check engine light for P0401 until now. and do you know how to get the flow numbers w/o using Techstream? i don't have one right now to test, a have wifi OBD2 that i've using to monitor my battery, coolant...
     
    #5 htcmember, Jun 12, 2022
  6. ChapmanF

    ChapmanF Senior Member

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    It's a standard OBD "Mode 6" monitor test result; various scan tools and phone apps can bring it up. There are some examples in that linked thread.
     
    #6 ChapmanF, Jun 12, 2022
  7. htcmember

    htcmember Junior Member

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    Can you share me a little bit more on that, i will try to capture today when i assembly them all back and give it a test too with OBD2 and torque pro if possible. thank a lot in advance and i appreciate your help and advise!
     
    #7 htcmember, Jun 12, 2022
  8. ChapmanF

    ChapmanF Senior Member

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    Try looking at this post and the few after it in that thread I linked. Part way down on page 3 of the thread, the page I linked to.
     
    #8 ChapmanF, Jun 12, 2022
  9. Mendel Leisk

    Mendel Leisk Senior Member

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    It might have been there, and dropped when you pulled the cooler. That’s what happened to me. Have a look: mine dropped a little ways, not all the way through.
     
    #9 Mendel Leisk, Jun 12, 2022
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  10. htcmember

    htcmember Junior Member

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    Let me try to find again, weird thing that I can not find it all evening yesterday
     
    #10 htcmember, Jun 12, 2022
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  11. htcmember

    htcmember Junior Member

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    Here are my test value after test drive today

    MID:$21 TID:$a9
    - Catalyst Monitor Bank 1
    Max: 9.99393 Min: 0.24979
    Test result value: 0.25894
    PASS
    ----
    MID:$31 TID:$bd
    - EGR Monitor Bank 1
    Max: 655.34998kPa Min: 0.87kPa
    Test result value: 20.03kPa
    PASS

    But during tonight ride, i suddently heard a sound from torque app that made me heart attack "inverter coolant overheat" and it pops up the screenshot as below with inv coolant = 170oC ????? OMG

    Hope that's only a faulty issue with my OBD2 tool Screenshot_20220614-214959_Torque.jpg
     
    #11 htcmember, Jun 15, 2022
  12. ASRDogman

    ASRDogman Senior Member

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    Maybe the invertor pump is bad? And if you know the "obd tool" is bad, why trust it with
    any other reading?
     
    #12 ASRDogman, Jun 15, 2022
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  13. ChapmanF

    ChapmanF Senior Member

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    That's right in the ballpark of results we've been seeing after full cleaning.

    What would have been really interesting would be your number at almost 200k before cleaning.
     
    #13 ChapmanF, Jun 15, 2022
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  14. htcmember

    htcmember Junior Member

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    yes, my bad that not thinking about that before doing my job so that we can have a clear before and after with a great 200k experience :)

    Btw, do you have any suggest on how to test the inverter pump to make sure i'm ok on the inverter coolant overheat issue that shared above?

    Loop Sir @Mendel Leisk in as well to advise :)

    thank you,
     
    #14 htcmember, Jun 15, 2022
  15. ChapmanF

    ChapmanF Senior Member

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    The typical check is to go look in the inverter coolant reservoir while the car is IG ON, and see if the coolant is turbulent.

    In Gen 1 and Gen 2, the pump was just on or off, and ran whenever the car was IG ON, so that was easy.

    In Gen 3 it's a variable-speed pump, and the ECU is more hands-on in controlling it, so the same check might not be quite as foolproof. On the other hand, the Gen 3 inverter pump has a tachometer, and if your scan tool shows you that PID ("Inverter W/P Revolution" is what it's called in Techstream), you can look at that. It's in the Hybrid Control data list.
     
    #15 ChapmanF, Jun 15, 2022
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  16. htcmember

    htcmember Junior Member

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    in this case, i would like to buy a Techstream clone device from ebay/amazon to deeply investigate my issue, do you have any suggestion on a good tool as your experience? i see a lot of one selling on ebay now but not sure which one is good enough for Techstream testing?
     
    #16 htcmember, Jun 15, 2022
  17. ChapmanF

    ChapmanF Senior Member

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    I would suggest a forum search; you'll find a lot of those kinds of reports here, running from recent to years old. With older ones, some of the information may have gone out of date, but they can still be worth looking at. I don't really have anything to speak of that I could add myself to what's already here about that.
     
    #17 ChapmanF, Jun 15, 2022
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  18. htcmember

    htcmember Junior Member

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    Sure and thanks for your advises as always, i really appreciate these help!
     
    #18 htcmember, Jun 15, 2022
  19. Tande

    Tande Active Member

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    FWIW .......I sorta like the idea, that if "Toyota" thinks it should be there......it's OK with me! ........
     
    #19 Tande, Jun 15, 2022
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  20. htcmember

    htcmember Junior Member

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    Screenshot_20220615-185852_Torque.jpg
    Hi @ChapmanF,
    I've tried to check and test with Torque.

    It's actually turbulent and the inverter pump also showed as attached pics.

    And i have a camp trip on my prius this weekend, really concern about that but can not deeply check the issue w/o TechStream OBD2 cable? Hope that we have other way to double check so that i can have peace of mind for my trip :)

    Thank you,
     
    #20 htcmember, Jun 16, 2022
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