PLEASE help. Completely stuck and no idea what to do next. Linear Relearn keeps failing!

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by jbelcourt, Feb 29, 2020.

  1. jbelcourt

    jbelcourt New Member

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    I feel like I've tried everything I've seen on here and on YouTube.

    I replaced my actuator. Bleed process was fine and passed. I should have left well enough alone but I cleared the memory to do the relearn like I was told to do. Now, I can't get it to pass. It was failing with 25 seconds left and now it's worse and failing right when it starts.

    I have no idea what to do and I need my car Monday for work. Is there anything I can do at this point?

    Please help.
     
  2. jbelcourt

    jbelcourt New Member

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    Here's a picture of the freeze frame data.
     

    Attached Files:

  3. jbelcourt

    jbelcourt New Member

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  4. valde3

    valde3 Senior Member

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    Your 12v battery voltage is way too low! You need keep it up during this. Power supply, cables from another car or battery, maybe charging or new 12v battery, or some other method.
     
  5. jbelcourt

    jbelcourt New Member

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    So because the battery is too low, it's failing at the end of the learning process?

    After I posted this, I drove the car around for a little while then came back and tried again and it was the same results. I'll attempt jumping the battery to another car and see what happens then run the process again.

    If it still fails, I would assume the actuator I installed is bad? Or should I attempt to bleed the system more and try again? (I don't know what causes this process to fail so I don't even know what to test for).
     
  6. valde3

    valde3 Senior Member

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    Just look at the freeze frame data. Your 12V system voltages are around 9v! That's probably why the learning process fails.

    Just jump starting wont help if it can start on it's own anyways. You might just have a battery that's bad enough to not be able to do the learning but is good enough to start the Prius. There's also other possibilities but testing if you can get the learning done by keeping the 12V system voltage up is easy test.

    If what you got is jumper cables and another car keep the jumper cables connected with the another car that's turned off and then try to do the learning process. If it still fails check the freeze frame again. What the battery voltages show?
     
    #6 valde3, Mar 1, 2020
    Last edited: Mar 1, 2020
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  7. jbelcourt

    jbelcourt New Member

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    I'm just waking up, I had a really long day yesterday working on this. I'll go outside now and hook it to my wife's car and try running the test again. I'll report back with what happens and with the freeze frame data.
     
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  8. jbelcourt

    jbelcourt New Member

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    Have it hooked to another car. It made it further this time, 30 seconds remaining, but still failed. It beeped when it first started the test and I got low accumulator pressure warning, which I haven't gotten with this actuator before.

    I've attached everything.
     

    Attached Files:

  9. valde3

    valde3 Senior Member

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    Can you post the frame data for C1256 also?
     
  10. jbelcourt

    jbelcourt New Member

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    Absolutely.
     

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  11. valde3

    valde3 Senior Member

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    Might just be a bad actuator. Or something could have happened during the actuator replacement. Was it used actuator?

    Voltages seem to be between 10.9 and 12V. Maybe you could try to do the relearn with slightly higher voltage but it probably wount make a difference. In a shop we use 13.8V power supply. You could just keep the another car running if you trust it's electrical system.

    Here's the documents:
    Linear solenoid valve calibration: https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/repair%20manual/04pruisr/05/21avn/ciinitia.pdf#[0,{%22name%22:%22XYZ%22},null,null,null]
    C1345 and C1368: https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/repair%20manual/04pruisr/05/21avn/cic13456.pdf
    C1256: https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/repair%20manual/04pruisr/05/21avn/cic13456.pdf
     
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  12. jbelcourt

    jbelcourt New Member

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    It was a used actuator. I think I'm better off buying a used one that was tested and has a warranty and try installing that one. I pulled this one myself from the junk yard, I was trying to save money. I bought this car from a dealer 30 days ago and I've had several issues with it already, I'm just beyond frustrated.

    I really appreciate all your help and insight, thank you.

    My last question is, is it safe to drive with the learn process not in place? I drove it around last night to test and it seemed fine. I need it for work so if it's "safe" I'll use it for now while the other actuator is on order.
     
  13. valde3

    valde3 Senior Member

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    It's not really safe to drive with malfunctioning brake actuator. You could even go down to manual (non assisted) front brakes only and that would increase you stopping distance a lot.
     
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  14. jbelcourt

    jbelcourt New Member

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    I just saw in your instructions you linked that the car is suppose to be in test mode when performing the learn process? Or did I read that incorrectly?

    EDIT- never mind, doesn't matter because I just attempted it that way. I'll just order another actuator.
     
  15. jbelcourt

    jbelcourt New Member

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    I just ordered an actuator on eBay for $300. Tested and guaranteed working with a 180-day warranty. Should have it installed in the next two weekends.

    Hoping for the best.

    Should I do the zero down procedure before removing this actuator? I didn't see that option before doing this one.

    Also, I'll update you guys if this other one works.
     
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  16. jbelcourt

    jbelcourt New Member

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    @valde3 just wanted to thank you again. The other actuator came in Friday and I replaced it today successfully. I jumped the battery to my wife's car just to be safe but the bleeding and relearning process both went through without a hitch and my car is back on the road.
     
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