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Inverter pump Problem?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Glyn, Jun 28, 2018.

  1. Glyn

    Glyn New Member

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    Prius 2010 model, ZVW30, LHD
    I'm having trouble with a P0AA6 code. Orange triangle, Check Hybrid System message.
    Took it to the local Toyota dalership who ran tests and found the fault code, With no sub-codes.
    They suggest a new inverter is needed. I'm not really convinced.
    Car runs OK, expect for the warning message and the fact that the EV, Eco and Sport modes become unavailable after about a minute of driving. Also the arrows on the charging display disappear ( the Diagramm of the prius showing were the electricity is flowing to and from)
    Air-con works OK.
    I checked the header tank for the inverter coolant but can see no movement.
    My question, at this point, is, how much turbulance should I be seeing?
    I'll try to upload a video I took of it.



    Any other way of checking or any suggestions as to what the problem may be?
    Thanks.
     
    #1 Glyn, Jun 28, 2018
  2. bisco

    bisco cookie crumbler

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    welcome!
    hard to tell, looks like there is movement. i believe the pump either works or it doesn't.
     
    #2 bisco, Jun 28, 2018
  3. padroo

    padroo Senior Member

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    I'm thinking there should be continual turbulence in the tank.
     
    #3 padroo, Jun 28, 2018
  4. bisco

    bisco cookie crumbler

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    you would know better than i.(y)
     
    #4 bisco, Jun 28, 2018
  5. padroo

    padroo Senior Member

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    This is from a 2005.

     
    #5 padroo, Jun 28, 2018
  6. Glyn

    Glyn New Member

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    Thanks for the replies so far. I was expecting the turbulence to be fairly obvious, though I have since learned that the speed is variable on the Gen 3 pump. I guess this is why there is a four pin connector to it.
    Maybe the inverter really does need replacing, it's just that the Toyota mechanic seemed less than convincing.
    I wonder if it`s possible to speed the pump up using Techstream, I`ve ordered an OBDII connector, hasn`t arrived yet.
     
    #6 Glyn, Jun 29, 2018
  7. Glyn

    Glyn New Member

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    OK, quick update.
    I`m fairly sure that the inverter pump IS working.
    Although there is no turbulence present, the level in the right hand chamber is higher (compared to that of the left)
    when in 'Ready' as compared to when switched off.
    So, back to the drawing board with regards to my P0AA6 code problem.
    I was hoping for an easy fix with the inverter pump.
     
    #7 Glyn, Jun 29, 2018
  8. padroo

    padroo Senior Member

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    I couldn't find a good YouTube video gorge a Gen 3 Prius.
     
    #8 padroo, Jun 29, 2018
  9. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Whether or not the inverter pump is working, that is unrelated to DTC P0AA6. That fault code is telling you that the hybrid system has a high voltage ground fault. If you had a three-digit subcode, that might narrow down where the ground fault exists. It could be in the high voltage traction battery, or the inverter, or the transaxle, or the AC compressor.

    You probably already know that a workaround is to disconnect the 12V battery to clear the fault code, then the car can be started once. I suggest that you wait for the three-digit subcode to appear before you start replacing components.

    Another possibility is to use a megohmmeter to determine where the ground fault exists. This is basically an ohmmeter which uses high voltage. You would have to disconnect the cabling between the various components, then see which component has the ground fault.
     
    #9 Patrick Wong, Jul 1, 2018
    m.wynn likes this.
  10. padroo

    padroo Senior Member

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    #10 padroo, Jul 1, 2018
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