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P2601 Replaced Auxiliary Pump but not refilling

Discussion in 'Gen 2 Prius Main Forum' started by LocalPriusDan, May 11, 2018.

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  1. LocalPriusDan

    LocalPriusDan New Member

    Joined:
    May 11, 2018
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    Location:
    Howell NJ
    Vehicle:
    2008 Prius
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    N/A
    Hello,

    I recently had an issue where where the P2601 error code was displaying on my prius, I ended up clearing it a few times this week and ordered a replacement auxiliary pump. Following some instructions I removed the tire, replaced the inactive heat sink pump and reconnected the wiring. After attempting to refill the overflow, and doing the bleeding, the fluid is circulating but does not appear to be filling up the gallon of fluid that was drained. I checked the voltages on the pins going into the small auxiliary motor and it did not have any voltage.

    I was reading up that there was a relay that may be the source of the issue, is there an easy way to test the relay and force the pump to run?
     
    #1 LocalPriusDan, May 11, 2018
  2. Patrick Wong

    Patrick Wong DIY Enthusiast

    Joined:
    Mar 8, 2008
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    Location:
    Green Valley, AZ
    Vehicle:
    2015 Prius
    Model:
    Two
    The coolant heat recovery system pump receives voltage only a few seconds at a time upon startup and shutdown, so you have to force the pump to manually run. You can use Toyota Techstream to do that, or you can do this manually by shorting the correct terminals of the CHRS relay socket. Do not run the pump more than 30 seconds at a time, to avoid overheating it.

    Even after you think you are done, it is not easy to get all of the air out of the engine coolant loop, so keep checking the radiator fluid level at the radiator itself (not just the overflow reservoir) on a daily basis when the engine is cold, and fill as needed.

    See my post #22 here:
    Changing engine coolant | Page 2 | PriusChat
     
    #2 Patrick Wong, May 12, 2018
    Last edited: May 12, 2018
    SFO and M in KC like this.
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