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Odd behaviour

Discussion in 'Gen 2 Prius Main Forum' started by Has Raf, Oct 3, 2024.

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  1. Has Raf

    Has Raf Junior Member

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    I was having an issue with my car. As I would come to a stop, just before, as I was slowing down, the car would jerk and jolt forwards. It’d be worse the faster I was going, and the harsher I’d be braking. (I try to brake slowly and gradually of course, not harshly). It would feel like I was being hit from behind the car. Thankfully, this has now subsided, but I now have the yellow VSC, ABS and (!) on my dash… I’ve ordered a Autel, but hasn’t arrived yet, so can’t read error codes at the moment. Help please!

    upload_2024-10-3_20-42-50.jpeg
     
    #1 Has Raf, Oct 3, 2024
  2. ChapmanF

    ChapmanF Senior Member

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    #2 ChapmanF, Oct 3, 2024
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  3. Has Raf

    Has Raf Junior Member

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    Thank you. This seems awfully complex and time consuming for me. I’ll wait for my Autel. I wasn’t really asking about the error codes. In more curious about the odd behaviour.
     
    #3 Has Raf, Oct 3, 2024
  4. pasadena_commut

    pasadena_commut Senior Member

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    Looks like the car is doing its best to tell you: problem with the braking system.
     
    #4 pasadena_commut, Oct 3, 2024
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  5. ChapmanF

    ChapmanF Senior Member

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    It even wants to tell you what problem with the braking system, but you have to ask it.
     
    #5 ChapmanF, Oct 3, 2024
  6. Has Raf

    Has Raf Junior Member

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    Again, this post wasn’t so much about the error codes. What about the physical issue, which has now resolved, but error codes instead?
     
    #6 Has Raf, Oct 4, 2024
  7. rjparker

    rjparker Tu Humilde Sirviente

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    Your car is brake by wire meaning a computer is opening and closing valves in the master cylinder to allow a hydraulic pump and accumulator to pressurize the brake calipers. In most cases regenerative braking where the wheels are driving a generator do most of the braking. So your system was failing at the time.
     
    #7 rjparker, Oct 4, 2024
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  8. Has Raf

    Has Raf Junior Member

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    But, at the time the car was malfunctioning, there were no warnings on the dash. Now, the car is not malfunctioning when braking, but error cars are displayed as above. Odd?
     
    #8 Has Raf, Oct 4, 2024
  9. rjparker

    rjparker Tu Humilde Sirviente

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    Many failures require multiple trips to code.
     
    #9 rjparker, Oct 4, 2024
  10. Has Raf

    Has Raf Junior Member

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    I just ran a diagnostic using mini Autel MaxiAP AP200, and no fault codes. But the VSC, ABS and (!) lights are on…
     
    #10 Has Raf, Oct 6, 2024
  11. Brian1954

    Brian1954 Senior Member

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    Did you do a "full scan" or the "regular scan"?
     
    #11 Brian1954, Oct 6, 2024
  12. Has Raf

    Has Raf Junior Member

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    IMG_2748.jpeg
    Full I’m assuming. This was the result:
     
    #12 Has Raf, Oct 6, 2024
  13. Brian1954

    Brian1954 Senior Member

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    What app are you using and the version of the app?

    Take a look at this linked thread with screenshots of the correct app:https://priuschat.com/index.php?posts/3248209 Read post #1.

    It looks like you did not register or link the Autel AP200 to your Toyota Prius. You can not run a full scan until you have done this, and the Toyota data file is downloaded to your phone.

    Maybe @mr_guy_mann can help with the app.
     
    #13 Brian1954, Oct 6, 2024
    Last edited: Oct 6, 2024
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  14. Has Raf

    Has Raf Junior Member

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    Yes, I did download the data file I believe. My app looks like those screenshots. I’m using MaxiAP200, version 1.47 on iOS. It just said 0 errors…
     
    #14 Has Raf, Oct 6, 2024
  15. Brian1954

    Brian1954 Senior Member

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    I think that you do not have something set up correctly in the app. All the vehicle information for your Prius is not showing in the screenshot that you uploaded. Something is not right.

    I do not own or use the Autel AP200, so I am not able to help you any further.

    Edit: Take a look at the attached Autel AP200 Quick Reference Guide for North America
     

    Attached Files:

    #15 Brian1954, Oct 6, 2024
    Last edited: Oct 6, 2024
  16. Has Raf

    Has Raf Junior Member

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    Ah, yes. I fear I have not set-up the app correctly. Thanks for your help.
     
    #16 Has Raf, Oct 6, 2024
  17. Has Raf

    Has Raf Junior Member

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    IMG_2753.png IMG_2750.png IMG_2751.png IMG_2752.png These are the codes:
     
    #17 Has Raf, Oct 7, 2024
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  18. pasadena_commut

    pasadena_commut Senior Member

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    There are a few threads on C1235 which the OP should probably read. Unfortunately the ones I read faded out without a "this fixed it" at the end. Anyway, definitely go have a look to see what is stuck to the RH front speed sensor.
     
    #18 pasadena_commut, Oct 7, 2024
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  19. Has Raf

    Has Raf Junior Member

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    Codes cleared. warning lights off now, and the cars back to doing the jerking on slow braking before coming to a stop, weird! I need change a drop link, ball joint and lower engine mount, so I’ll check the speed sensor while I’m at it. PS speed sensor and ABS sensor same thing?
     
    #19 Has Raf, Oct 8, 2024
  20. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    Get a dealership to diagnose and propose a course of action, or is that just crazy talk in this day'n age?
     
    #20 Mendel Leisk, Oct 10, 2024
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