after shutoff water pump acting up

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Bob the Builder, Feb 21, 2015.

  1. Bob the Builder

    Bob the Builder Junior Member

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    When you shut down the car a pump moves water in the engine for a few seconds. Now it is making a grinding sound instead of the usual brrrrrr sound. It seems to keep trying because nothing is pumping. Can I shut down this program? I don't think I need it in my climate area anyway. Is this the unit under the recall I had done last year? Will Toyota stand behind the pump they replaced? Thanks for your help guys!! 128,000 miles 2005 Prius
     
    #1 Bob the Builder, Feb 21, 2015
  2. valde3

    valde3 Senior Member

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    No recall pump was inverter coolant pump. This pump is heat storage pump. I don’t think you can just turn it off.
     
    #2 valde3, Feb 21, 2015
  3. nh7o

    nh7o Off grid since 1980

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    You could unplug the motor, but that might set the check engine light. If you are in a warmer area, then yes, that whole system is superfluous. Have you changed the engine coolant on schedule? Some have reported improved pump lubrication as a result of that.
     
    #3 nh7o, Feb 21, 2015
  4. Bob the Builder

    Bob the Builder Junior Member

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    I was hoping it was something I could turn off. I had the coolant changed at 100K. Does anyone know where the pump is at so I could try unhooking it?
     
    #4 Bob the Builder, Feb 22, 2015
  5. valde3

    valde3 Senior Member

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    #5 valde3, Feb 22, 2015
  6. 69shovlhed

    69shovlhed Surly tree hugger

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    if your in a cold weather area, you need that pump. it might be failing and you need to replace it.
     
    #6 69shovlhed, Feb 22, 2015
  7. Bob the Builder

    Bob the Builder Junior Member

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    It looks like there is a relay controlling the pump. It is sporadic in operation. The sound is the relay clicking when in operation. Dealer wants a fee to find so I am hoping someone here has had the same problem and can tell me where the relay is.
     
    #7 Bob the Builder, Feb 24, 2015
  8. valde3

    valde3 Senior Member

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    100K maint - 5

    This shows removal of the relay from cowl relay box and jumping it to run the pump
     
    #8 valde3, Feb 24, 2015
  9. Bob the Builder

    Bob the Builder Junior Member

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    Thank you very much!!!!
     
    #9 Bob the Builder, Feb 24, 2015
  10. Bob the Builder

    Bob the Builder Junior Member

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    I opened the relay box and pushed all of them down and now the pump is working normally. It was corrosion on the terminals of the relay. Thanks for your help guys!!
     
    #10 Bob the Builder, Feb 26, 2015
  11. Lesk_The_Glut

    Lesk_The_Glut Junior Member

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    Anyone know how to get the code to stop appearing for this pump? I live in Bakersfield CA. It's not the coldest climate. After I replaced the coolant flow control valve, I was shorting the pump relay, during the bleeding process, with a multimeter. One lead was attached to the relay terminal and I touched the other lead to a nearby bold, causing an arc. Not my most brilliant move. The pump no longer runs. I don't know if I fried the pump itself or something else. But the car runs fine now. I'd just rather not have to repeatedly clear the code.
    Any ideas?
     
    #11 Lesk_The_Glut, Jun 1, 2015
  12. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Here is my idea: Check the 10A CHS W/P fuse and replace if the fuse is open.
     
    #12 Patrick Wong, Jun 1, 2015
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