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Inverter Water Pump vs Coolant control 04

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by hydride, Aug 14, 2014.

  1. hydride

    hydride Junior Member

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    Hi guys, my 04 finally showed the p0A93 code so, I've been doing some research.

    Luscious Garage did a tutorial and took out the inverter water pump, but when I checked mine, I didn't see a water pump like theirs; only the coolant control.

    What's the difference between the coolant control and the inverter water pump? Thanks for the help.

    Coolant Control
    [​IMG]

    Inverter Water Pump?
    [​IMG]
     
    #1 hydride, Aug 14, 2014
  2. Patrick Wong

    Patrick Wong DIY Enthusiast

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    The inverter coolant pump circulates coolant in the inverter/transaxle coolant loop. It is located behind the driver's headlight assembly. Your second photo shows an inverter coolant pump which is not mounted to the shiny metal bracket which comes with the pump and attaches to the pump base.

    The engine coolant valve can switch engine coolant flow between the cabin heater core and the coolant heat recovery system canister.

    DTC P0A93 means that the inverter cooling system has failed. Usually that is because the inverter coolant pump died, and this can be verified by looking for fluid turbulence in the inverter coolant reservoir when the Prius is IG-ON or READY. If you don't see this then the pump is not working or there is air trapped in the system.

    The inverter coolant pump was the subject of a recent Limited Service Campaign, which expired in November 2013.
     
    #2 Patrick Wong, Aug 14, 2014
    Last edited: Aug 14, 2014
    mclchu, m.wynn, Robert Holt and 1 other person like this.
  3. hydride

    hydride Junior Member

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    So, I would have to replace the pump of the first photo?
     
    #3 hydride, Aug 14, 2014
  4. Patrick Wong

    Patrick Wong DIY Enthusiast

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    The first photo shows a valve, not a pump. That valve is in the engine coolant loop and has nothing to do with P0A93.

    The second photo shows the correct inverter coolant pump, the only issue is that particular pump happens to not be mounted to the metal bracket. When you buy the correct pump, it will come with a bracket.
     
    #4 Patrick Wong, Aug 14, 2014
  5. hydride

    hydride Junior Member

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    Okay. I get it now. Where is the inverter water pump located then? Is it near the valve also?
     
    #5 hydride, Aug 15, 2014
  6. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Please see my post #2, first paragraph, second sentence.
     
    #6 Patrick Wong, Aug 15, 2014
  7. Ajourney101

    Ajourney101 Member

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    So if there is turbulence inside the inverter Reservoir does that mean it's working or it's not working?

    Posted via the PriusChat mobile app.
     
    #7 Ajourney101, Jun 28, 2017
  8. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Turbulence means the inverter coolant pump is working.
     
    #8 Patrick Wong, Jun 28, 2017
    m.wynn likes this.
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