P2601 Inverter coolant code always there

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by mite66, Apr 16, 2015.

  1. mite66

    mite66 Junior Member

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    Hello all,

    I had this code shortly after I bought the car last fall.

    I easily found that the electric pump was dead and I replaced it with a brand new one. I made sure that I had no air bubbles trapped in the circuit and everything looked fine.

    But now I'm still stuck with this error code that steadily appears after each reset.

    I can hear the pump running and see the coolant move in the plastic tank.

    So where should I look now ?

    Thanks
     
  2. ChapmanF

    ChapmanF Senior Member

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    Hi!
    • What's the code you're seeing?
    • Have you checked in the service manual at techinfo.toyota.com for what areas it says to check in the case of that code?
    Cheers,
    -Chap
     
  3. bisco

    bisco cookie crumbler

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  4. Patrick Wong

    Patrick Wong DIY Enthusiast

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    There are several "electric pumps" so you need to be specific about which one you replaced. I assume that you replaced the inverter coolant pump, which is located in front of the driver's side headlight fixture.

    DTC P2601 relates to failure of the engine coolant heat recovery pump. This pump is located near the coolant heat recovery canister hidden in the driver's side front fender. You need to remove the fender liner for access.

    Test the pump by applying 12VDC to the connector pins. If you don't hear the pump run, then it is dead. If you do hear the pump run, then test the CHRS relay which is located in the small relay box mounted to the firewall. Remove the relay, use an ohmmeter to determine the relay coil terminals, and apply 12VDC to the relay coil. You should hear the relay engage. Then use an ohmmeter to measure resistance across the switched terminals, which should measure 0.5 ohm or less after accounting for resistance in the test leads.

    Hopefully by now you've found the problem. If not, there may be a fault in the wiring harness which connects the relay.
     
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  5. ChapmanF

    ChapmanF Senior Member

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    Shoot, I have to read the title of the post too? :oops:

    -Chap
     
  6. bisco

    bisco cookie crumbler

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    i know, right?:)
     
  7. mite66

    mite66 Junior Member

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    Thanks Patrick,

    I'm now full of hope :)

    I'll work on this this weekend and hopefully get rid of this problem.

    Can't wait.

    Thanks again
     
  8. 08PriusXSJ

    08PriusXSJ Junior Member

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    Did you fix it?
     
  9. Basemodel325

    Basemodel325 Junior Member

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    Hey, I did this, no power to wires. Pump works when applying straight power from a battery. Can't figure it out. Swapped relays. Still didnt work. Where do I go next?
     
  10. ChapmanF

    ChapmanF Senior Member

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    Wiring diagram and repair manual (techinfo.toyota.com). Do you have a multimeter?

    -Chap
     
  11. Basemodel325

    Basemodel325 Junior Member

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    Yes I have a multimeter.
     
  12. Basemodel325

    Basemodel325 Junior Member

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    No subscription.
     
  13. Basemodel325

    Basemodel325 Junior Member

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    Well I have a question rather, exactly when SHOULD the heat storage pump (not inverter. I know the difference) be turned on? Always on? Cold start only?
    I ask because if it is switched on and off I may not be checking to see if it's running at the right time.
     
  14. dolj

    dolj Senior Member

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    Only on start up and shutdown. Its function is to store hot coolant, which is then used to pre-heat the block. Therefore it runs to take hot coolant into the thermos on shut down, and subsequently it pumps the hot coolant out of the thermos on start up.
     
  15. Basemodel325

    Basemodel325 Junior Member

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    Looks like I need to do a once more check to make sure. I never checked on perfect cold start, nor shut off.
    How long would it run on each of those times? Ballpark estimate, 10 seconds? Or a few minutes ?
     
  16. dolj

    dolj Senior Member

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    I don't think it needs to be a cold start, it should run at every start and shut down. But don't quote me on that, as we don't have that feature on our models. As for how long, idk, but would guess as long as it takes, which would be not long, I guess.
     
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