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Cataclean and EGR Clog Codes

Discussion in 'Gen 3 Prius Technical Discussion' started by C-in-DC, Feb 21, 2023.

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  1. ChapmanF

    ChapmanF Senior Member

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    As I was getting at in #72, if there were cash offered to think of a story how that could happen, I would be able to think of one, but I have no idea whether it would be realistic. Maybe it would require such a large leak the engine flat-out wouldn't run. Or maybe not....
     
    #81 ChapmanF, Mar 11, 2023
  2. C-in-DC

    C-in-DC Member

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    this video confused me then. Diff car.
     
    #82 C-in-DC, Mar 11, 2023
  3. ChapmanF

    ChapmanF Senior Member

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    Haven't watched the video, but as I said, I can think of a possible story but I do not know if it's plausible, realistic, or not. I meant that the way I said it: I don't know.
     
    #83 ChapmanF, Mar 11, 2023
  4. C-in-DC

    C-in-DC Member

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    I understand, wasn’t questioning anyone’s expertise especially not any senior members. Really appreciate everyone’s help and insight. I was just explaining where I got the incorrect idea from (the video, another cars diagram) and was trying to wrap my head around the system.
     
    #84 C-in-DC, Mar 11, 2023
  5. ChapmanF

    ChapmanF Senior Member

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    Maybe it's not incorrect. At least I haven't said it's incorrect. Only that I don't know.
     
    #85 ChapmanF, Mar 11, 2023
  6. AzusaPrius

    AzusaPrius Senior Member

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    Each time you reset the engine light, the system will need another 500 miles to check if P0420 is still there again.
     
    #86 AzusaPrius, Mar 11, 2023
  7. ChapmanF

    ChapmanF Senior Member

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    Might not be 500 miles every time (or even close), but the A/F sensor and O₂ sensor monitors do have to complete with passing status first, before the catalyst monitor is even able to run, and then it runs once per drive and only in certain temperature and load conditions, and to set a P0420 that monitor has to complete with not-passed status on two drives in a row. (If the code was set before and is now remembered as permanent, the monitor has to complete with passing status on three drives in a row for the permanent code to go away on its own. Or you can chase it away by driving the confirmation pattern on purpose.)
     
    #87 ChapmanF, Mar 11, 2023
  8. C-in-DC

    C-in-DC Member

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    I drive 5 hours straight daily. The check engine light would come on at the very end of that time while going 70 on the highway. This is the first week the code hasn’t come up. I still have the other codes though. been using premium gas and my mpg have increased. I stopped resetting the check engine light this week.
     
    #88 C-in-DC, Mar 11, 2023
  9. C-in-DC

    C-in-DC Member

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    Definitely drive more than that in a week. Hasn’t come back this week.
     
    #89 C-in-DC, Mar 11, 2023
  10. AzusaPrius

    AzusaPrius Senior Member

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    Well I dont want to lead you on but if that code doesnt come back, then I guess it would be safe to say that cataclean works.

    Let check engine light stay on and dont reset it anymore.

    Your cat might not be that bad if cataclean did its job.

    You can seek the other codes out and try to fix what you think it is but just dont reset the codes after you fix anything, let the computers delete the codes on their own.
     
    #90 AzusaPrius, Mar 12, 2023
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  11. C-in-DC

    C-in-DC Member

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    I think I installed the gaskets on the new egr wrong. This is the only video I could find that tries to explain how they should be installed.

    https://youtube/TSyMG7ZfsSs
     
    #91 C-in-DC, Mar 12, 2023
  12. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    ^ I watched that video, then made this sketch (attached). Not 100% sure I got it right, think I do. Also not sure of the ramifications of flipping them.
     

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    #92 Mendel Leisk, Mar 12, 2023
  13. C-in-DC

    C-in-DC Member

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    Thanks, I saw one when I was doing the engine swap that said if they’re oriented wrong they won’t expand properly and would cause overheating/code to appear. I can’t find that video again though. I thought it was the car care nut’s video but nope.
     
    #93 C-in-DC, Mar 12, 2023
  14. mr_guy_mann

    mr_guy_mann Senior Member

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    If that capture is from your car, I am wondering why does the ECT show (-13°F)?

    I mentioned that you have to drive the car until the engine and cat are up to normal operating temperatures. Nothing will work properly when it's really cold.

    The ECM doesn't turn on the heater for the B1S2 O2 sensor until the engine has run for awhile (that's why it says - "not available").

    Posted via the PriusChat mobile app.
     
    #94 mr_guy_mann, Mar 13, 2023
  15. C-in-DC

    C-in-DC Member

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    I was wondering why it was reading negative as well. Could be I wired the temp sensor incorrectly. been getting positive readings around 153 f while driving.

    I was reading the temp diff upstream and downstream of the cat. They’re reading less than 100 degrees. Around only 60 degrees difference.
     

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    #95 C-in-DC, Mar 14, 2023
    Last edited: Mar 14, 2023
  16. C-in-DC

    C-in-DC Member

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    Swapped out hoses 23826 1 and 2 as well as vacuum valve. No effect on p0401. P0403 came back so there's a short somewhere. I'm wondering if I should clear codes and see if the evaporator ones p0441 and po455 come back. Ecu isn't clearing them.
     

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    #96 C-in-DC, Mar 14, 2023
  17. C-in-DC

    C-in-DC Member

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    P0403 wouldn’t clear. The problem is where the wires are pinned. I can’t get them to sit properly and that’s what’s cutting the circuit is my guess.

    Later in the day, the car had a misfire on start up. Was able to push the wires down in and finally p403 cleared. I have the wire harness from the 2016 motor. I’m wondering if I should cut that egr connection off and solder it to the 2010 harness to get rid of the problem. Clearly it’s just going to keep shorting because I can’t pin it right. Any suggestions on how to re-pin?

    The replacement cat was delivered Saturday. Waiting to see if the evap codes and egr codes will come back and how long it’ll take them…
     
    #97 C-in-DC, Mar 14, 2023
  18. ASRDogman

    ASRDogman Senior Member

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    It would probably be a good idea to fix the short....

     
    #98 ASRDogman, Mar 14, 2023
  19. ChapmanF

    ChapmanF Senior Member

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    Can you show a photo? Have you looked at the connector in the wiring diagram to be clear on how both the primary and secondary terminal retention features work?
     
    #99 ChapmanF, Mar 14, 2023
  20. C-in-DC

    C-in-DC Member

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    FB39E21B-5C73-4B78-882A-FFFB85AD8616.jpeg 02310741-7886-420B-AE92-13089A608C62.jpeg FB39E21B-5C73-4B78-882A-FFFB85AD8616.jpeg
     
    #100 C-in-DC, Mar 14, 2023
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