2005 inverter coolant pump

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Martin_211, Oct 26, 2019.

  1. Martin_211

    Martin_211 New Member

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    I'm new to this but I just bought a 2005 Toyota Prius with about 233,000 miles on it and about a month of having it the inverter coolant pump had went out. After picking it back up the check engine light came on for inverter coolant pump performance. The car drove fine but the AC had stopped working. The next morning I came back out to the car and it will not start. I hear the coolant pump on when I turn the car on just no ready light. Any Ideas of what it can be?
     
  2. bisco

    bisco cookie crumbler

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    any swirling in the coolant reservoir?

    how is the 12v health?
     
  3. Martin_211

    Martin_211 New Member

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    Yes the coolant is swirling in there and the battery is in good health.
     
  4. dolj

    dolj Senior Member

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    You need to get the codes read and report what they are here. Then we can give you a much better idea of where you're at.
     
    #4 dolj, Oct 30, 2019
    Last edited: Oct 30, 2019
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  5. Martin_211

    Martin_211 New Member

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    The codes read P0A93 inverter cooling performance.
     
  6. bisco

    bisco cookie crumbler

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    now you need to subscribe to the service manual at techinfo.toyota.com and use the trouble shooting tree
     
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  7. Patrick Wong

    Patrick Wong DIY Enthusiast

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    What are you using to retrieve the fault codes? If the only problem was the inverter coolant pump, the car should become READY after the inverter has cooled down from overheating. It appears that the pump is operational if you can see fluid turbulence in the inverter coolant reservoir.

    If the inverter coolant pump is working, based upon seeing fluid turbulence, and the inverter is still overheating, make sure that the radiator fans are working. If the fans are working then the only other possibility is to replace the inverter, which you should not do casually.

    If you are not using Mini VCI to retrieve the fault codes, I suggest that you obtain that software and cable.

    Also check the voltage across the 12V battery.
     
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  8. EternalPrius

    EternalPrius New Member

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    Was it an independent mechanic using a non-dealer part? I would suspect the pump first thing. any other symptoms? you can find the OEM Toyota pump online for only $90. it's only $40 or so more than a third party pump, and you should use it. P0A93 is the water pump failure code. It shouldn't happen once you've replaced it.

    Have the codes been cleared properly? What may be happening is that they didn't clear the stored inverter pump codes so the vehicle is behaving as though the inverter pump is still bad. the car will store the code unless you properly clear it. You need to disconnect the 12v battery overnight (the one in the trunk) and reconnect.
     
    #8 EternalPrius, Nov 1, 2019
    Last edited: Nov 1, 2019
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