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CVT slip and Engine runs

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by abra, Aug 25, 2013.

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  1. daveprius09

    daveprius09 Junior Member

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    Responding to jnet; Gen III Prius will produce a hum sound when driving forward to alert pedestrians so they hear you. As for ICE always on, can be caused by batteries getting hot & the sensors will tell the processor to reduce EV operation.
    Should check for any codes that might have set. Also have you heard the battery fan come on high speed? If not, maybe there is a problem with battery fan/cooling system.
     
    #21 daveprius09, Aug 27, 2013
  2. abra

    abra Member

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    Thanks for the info, I will be taking it in on Wed.
    I did manage to capture video of it happing.
    Btw I noticed the only time it really acts up is when I just filled up (No I dont force top off the tank, and yes the car is off) this is going to be fun.
     
    #22 abra, Aug 31, 2013
  3. thordehr

    thordehr Member

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    You probably popped the #1 motor generator or the #1 Inverter. It's the MG1 that starts the ICE.
     
    #23 thordehr, Aug 31, 2013
  4. thordehr

    thordehr Member

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    This CVT can't slip and really we don't have a CVT but rather a PSD (power split device)

    If you have an abnormal drive problem, it's a problem with one of your electric motors or the internal combustion motor, or the control of them.

    A LOT of good info on this webpage:

    Toyota Prius - Power Split Device
     
    #24 thordehr, Aug 31, 2013
  5. GrumpyCabbie

    GrumpyCabbie Senior Member

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    It was the inverter and was replaced outside of warranty and shipped away to Toyota UK HQ - apparantly.

    A couple months before the failure there was a continuous high pitched whine from the inverter for about 5 seconds when going down a hill. No issues and no problems - then. Not long after going down that same hill a few months later my inverter blew.

    Just a warning incase anyone hears similar.
     
    #25 GrumpyCabbie, Aug 31, 2013
  6. abra

    abra Member

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    Update, no codes and it didnt act up on them last week.
    BUT.....
    Yesterday it was acting up and for once I think I found the issue. I heard some kinda of noise and a smell coming from the back. I pulled over asap and found out my traction fan was on but NO air flow was seen.
    Today...massive cleaning (past owner had a dog or should I say dogs) 1 hour later and everthing cleaned out (the blower wheel complete clogged with hair) the slip/surge/no hybird was gone. I just hope it was cause.

    I also notice that some one else at some point of time was back there too, the seal was boken on the traction battery cover. But yet Toyota service says no such thing (just like the smug on LED screen under the dash cover).
     
    #26 abra, Sep 20, 2013
    john1701a and Umar Ali like this.
  7. abra

    abra Member

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    Test today
    For the first time I can EV to 22mph before ICE kicks in. I can also get the ICE to shut off when on a flat ground at 55mph. MPG is going up from 29 to 54(y) (80 miles on this tank, average speed 38) I can also nail full battery too.
    I would say I found the issue
     
    #27 abra, Sep 21, 2013
  8. 2k1Toaster

    2k1Toaster Brand New Prius Batteries

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    Classic symptoms and repair of an overheating battery. When the battery gets hot, the car tries to not use it.
     
    #28 2k1Toaster, Sep 21, 2013
  9. spiderman

    spiderman wretched

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    not possible for ice to shut down @ 55, perhaps 46.
    glad things are looking up!
     
    #29 spiderman, Sep 21, 2013
  10. john1701a

    john1701a Prius Guru

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    Thanks for the update. We always figured at some point the battery & vents would require cleaning. Only so much air can flow through before it gets impaired. A cool pack is a happy pack.
     
    #30 john1701a, Sep 21, 2013
  11. Jonny Zero

    Jonny Zero Giggidy

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    Make you wonder how these dealers "certify" their used cars. No idiot light on? All good, its certified.
     
    #31 Jonny Zero, Sep 21, 2013
    2k1Toaster, Madduck and spiderman like this.
  12. Former Member 68813

    Former Member 68813 Senior Member

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    Bingo!
     
    #32 Former Member 68813, Sep 21, 2013
  13. abra

    abra Member

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    Im not able to EV to 55, I able to mantian 55 with my mpg bar showing 100% . before it would be like 2bars
     
    #33 abra, Sep 24, 2013
  14. thordehr

    thordehr Member

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    Great you found the problem.

    Other than that, I found out I was wrong, there IS actually a clutch in the drive system. It's not conventional though. It is only there to absorb shocks in the driveline. It is a standard clutch, flywheel and pressure plate that is bolted together but without any throwout mechanism so the clamping force is constant. Extremely unlikely for one of these to get burnt out though.
     
    #34 thordehr, Sep 25, 2013
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