Inverter coolant pump. New pump may not be working.

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Tennessee Chris, May 18, 2019.

  1. Tennessee Chris

    Tennessee Chris New Member

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    I installed a new inverter coolant pump today. I had all the alarms that I had read that were common to inverter coolant pump failure and even had the error code checked at Advanced Auto. After completing install and adding fresh coolant, I still couldn’t feel the pump pumping or see coolant moving in reservoir. I then checked all fuses related to hybrid although I didn’t read in owners manual a specific one that called out inverter coolant pump. I didn’t find a blown fuse. Is there a way to check if pump is getting power?
     
    #1 Tennessee Chris, May 18, 2019
  2. TMR-JWAP

    TMR-JWAP Senior Member

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    The inverter cooling pump is powered by the AM2 fuse. If AM2 is open, your dash will be dead. There was an electrical plug on the pump, right?

    Was air bled from the system after the pump swap? Are you sure you connected the hoses correctly?

    1. With your foot off the brake, press the power button twice. The pump should run in this condition. This is the best way to check for flow, as the engine will not start, so there's no false vibrations created in the coolant

    If you have a meter, you can check for 12v at the electrical connector at the pump or at the connector by the inverter coolant reservoir. If there's no 12v at the connector after performing step 1, then you have a problem.
     
    #2 TMR-JWAP, May 19, 2019
    Last edited: May 19, 2019
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  3. Tennessee Chris

    Tennessee Chris New Member

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    Thanks, I will give that a try.
     
    #3 Tennessee Chris, May 19, 2019
  4. Tennessee Chris

    Tennessee Chris New Member

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    #4 Tennessee Chris, May 20, 2019
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