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P0401 code and EGR

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by memory, Jul 17, 2024.

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  1. memory

    memory Junior Member

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    Dziękuję za odpowiedź problem z EGR błąd p o 401 pojawia się pomimo wyczyszczenia układu EGR chłodniczki kolektora dolotowego wymieniłem również zawór PVC przejrzałem cały układ wyczyściłem maf i błąd pojawia się nadal dlatego próbuję jakiś kolejnych rozwiązań dzisiaj będę montował no kolejny czujnik map sensor może tutaj tkwi problem Sam już nie wiem gdzie może być przyczyna wyrzucania błędu EGR sama aplikacja nie kończy testu a w wynikach tak jak na załączonym screenie widnieje że to jest przeszedł ale nie ma żadnych wartości. Jestem w pracy więc może troszeczkę niechlujnie ten post powstał i nie skorzystałem z translatora sam jestem ciekaw jak to będzie wyglądało i brakuje mi tu opcji edycji na czacie albo jej nie potrafię odnaleźć
     
    #1 memory, Jul 17, 2024
  2. memory

    memory Junior Member

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    Screenshot_2024-07-17-09-58-22-037_com.ovz.carscanner.jpg Screenshot_2024-07-17-09-48-51-765_com.ovz.carscanner-edit.jpg
     
    #2 memory, Jul 17, 2024
  3. ChapmanF

    ChapmanF Senior Member

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    The test that has been circled in blue (MID $31 TID $BD) is the flow test of the EGR system. Because it is shown here with both minimum and maximum of 0 kPa, and a test value of 0 kPa (passing), I begin to suspect that the Prius sold in Poland did not have EGR.

    The test just above it (MID $21 TID $A9) is the catalyst oxygen storage capacity test. It shows a test value (0.222955) that is above the minimum (0.2196) and therefore also passing. Those values are similar to what others report. It seems common for the test value to be rather near the minimum, without necessarily being cause for alarm, as it seems to decrease very slowly, if at all, in reports taken years apart.
     
    #3 ChapmanF, Jul 17, 2024
  4. Tombukt2

    Tombukt2 Senior Member

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    Do you have a emissions In your country or you have lights on that's bothering you You can't really test the catalytic converter and then a Prius they're more finicky than in other cars so there's always that generally in the Prius you're going to be buying a new converter which is very expensive I mean you can take it out and try to look in it it may be coated with oil If so it's probably expired and ruined.
     
    #4 Tombukt2, Jul 17, 2024
  5. memory

    memory Junior Member

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    Dziękuję za odpowiedź, w moim kraju obowiązują ścisłe normy EGR, w tym strefy, do których samochody nie mogą wjechać. Nie spełniają takich norm.my car has an EGR system, but I cannot deal with the error regarding this system and the qndroid Car Scanner elm32 application is not able to diagnose, however, the techstrim that I also have worked as ChapmanF described, i.e. unlocked EGR in step 60 and the engine was not working properly. the error occurs only when the car warms up significantly, in Poland we currently have high temperatures of up to 34 degrees and around the outside temperature of 30 degrees, DTC P0401 returns when driving a lot around the city. what also worries me, compared to the older version of the prius 2, is the temperature of the mg1 engine, which the hybrid assistant shows as a temperature close to 100 degrees at some points??
     

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    #5 memory, Jul 17, 2024
  6. memory

    memory Junior Member

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    w moim kraju obowiązują surowe normy emisji spalin mój system mój samochód ma system EGR, ale jak widać coś z nim nie tak. jednak sam katalizator, z powodu nieprawidłowego działania EGR, również psuje się szybciej, więc chcę rozwiązać ten problem emisji spalin tak szybko, jak to możliwe. Do tej pory wymieniłem zawór PCV OEM Toyoty, wyczyściłem kolektor dolotowy, EGR i chłodnicę, aby zapewnić optymalne spaliny. Kiedy pojawia się błąd, samochód oczywiście działa gorzej. co ciekawe, sam błąd jest najpierw zapisywany jako oczekujący i prawdopodobnie po kilkukrotnym powtórzeniu komputer sygnalizuje go jako kontrolę silnika i wyświetla.
     
    #6 memory, Jul 18, 2024
  7. Tombukt2

    Tombukt2 Senior Member

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    Absolutely. Lol I don't have to worry much about that here
     
    #7 Tombukt2, Jul 18, 2024
  8. ChapmanF

    ChapmanF Senior Member

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    Ah, this is clear now. You are posting about the EGR system. I have asked the moderator to consider moving these posts (starting with #21) to a new thread about the EGR system and P0401. The thread where you have posted is about the catalytic converter, which is why I replied as I did above.

    So it appears that Car Scanner has a bug that prevents it showing the correct test/minimum/maximum values for the EGR flow monitor. Your post suggests that you also have access to Techstream. What values does Techstream show for the same monitor?
     
    #8 ChapmanF, Jul 18, 2024
  9. memory

    memory Junior Member

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    Dziś wybrałem się w dłuższą podróż i aplikacja zarejestrowała błąd układu EGR. Przetestuję ponownie Techstream Mini Vici i dam znać, co się stało.
     

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    #9 memory, Jul 18, 2024
  10. Tideland Prius

    Tideland Prius Moderator of the North
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    You may want to change your settings on the app you're using @memory as your posts are not showing in English but in Polish to the rest of us.
     
    #10 Tideland Prius, Jul 18, 2024
  11. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    What's the miles?
     
    #11 Mendel Leisk, Jul 18, 2024
  12. memory

    memory Junior Member

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    Sorry, I'm correcting myself now, p.s. I'm using a translator, maybe it doesn't always show what I want to say.
     
    #12 memory, Jul 18, 2024
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  13. memory

    memory Junior Member

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    230 000 miles(370 000km)
     
    #13 memory, Jul 18, 2024
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  14. memory

    memory Junior Member

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    I read the techstream EGR values, it looks bad, in the next few days I will replace the MAP sensor and buy an EGR stepper motor because I have suspicions about it and the exact element inside the drum with electromagnets. IMG_20240718_205411.jpg IMG_20240701_122358.jpg
     
    #14 memory, Jul 18, 2024
  15. memory

    memory Junior Member

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    IMG_20240718_221728.jpg
     
    #15 memory, Jul 18, 2024
  16. ChapmanF

    ChapmanF Senior Member

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    Oh, yes, that ski-jump seems to have a rut through it.

    I doubt that i would bother replacing the MAP sensor. I suspect it is only guilty of giving the bad news, and there is no point in shooting the messenger.

    If you wanted to quickly test the sanity of the MAP sensor, you could read its value in Techstream when the engine is not running, and compare it to the barometer report of your nearest weather station.
     
    #16 ChapmanF, Jul 18, 2024
  17. Tideland Prius

    Tideland Prius Moderator of the North
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    Thanks. It shows correctly now on our side. Sometimes the language setting gets messed up.
     
    #17 Tideland Prius, Jul 19, 2024
  18. memory

    memory Junior Member

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    I just replaced the MAP sensor because I had bought one and the current one seemed to be in worse condition, but it didn't change anything, the MAP sensor reading was the same, around 100 Kpa. I looked at the EGR valve again, I'm uploading videos to YouTube, as soon as it arrives I'll mount the part and let you know if it was the problem with this "jump" I hope it was because I'm running out of ideas, I'm already starting to look at the fuel vapor valve, maybe it opens at the wrong moment and causes pressure spikes.

    https://youtube.com/shorts/U1wajSqBn0c?si=03oEzYmMGS7lhca6

    https://youtube.com/shorts/_KzTLAF9MQw?si=MCxpicpOrJSu4YEX
     
    #18 memory, Jul 19, 2024
  19. memory

    memory Junior Member

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    #19 memory, Jul 31, 2024
  20. memory

    memory Junior Member

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    so far the P0401 EGR system error has not returned. Thank you all for your help. It was a problem with a worn out track,,jump ", of the electromagnet system. IMG_20240731_160323.jpg
     
    #20 memory, Jul 31, 2024
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