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Question Replacing Coolant?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Tamim, Mar 15, 2010.

  1. Tamim

    Tamim .

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    Hello everyone I have a question about replacing the engine coolant.

    My check engine light went off and the code is p1121 intake flow control valve. When I replace this valve I believe I need to also replace the engine coolant. I downloaded some of these procedures off of techinfo.toyota.com but I have a question.

    When looking at the engine coolant replacement directions it seems pretty straightforward but I think I remember someone on here saying you need to get the pump running by short circuiting something or using some sort of device to do this?

    Do I need any special tools to change the coolant in my car?
     
    #1 Tamim, Mar 15, 2010
  2. Tamim

    Tamim .

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    Sorry I didn't read it all the way through at the bottom of the page it says attach a hand held connecter to the DLC3? Does anyone know where I can get one of these hand held connector things?
     
    #2 Tamim, Mar 15, 2010
  3. Tamim

    Tamim .

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    Will an OBD II work?
     
    #3 Tamim, Mar 15, 2010
  4. Patrick Wong

    Patrick Wong DIY Enthusiast

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    If you refer to the procedures in the repair manual, you will note that the Toyota diagnostic laptop or hand-held tester is used to run the coolant heat recovery system pump. Assuming that you don't have access to that laptop or tester, another approach is required.

    Hence my suggestion that you can short the appropriate CHS relay terminals to run the pump. In that case no special tools would be required.

    See my post #42 as well as jreed's post #56 here:
    http://priuschat.com/forums/gen-ii-...shooting/30813-changing-engine-coolant-5.html
     
    #4 Patrick Wong, Mar 15, 2010
  5. triumph1

    triumph1 Member

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    If I were to use an Airlift, is it necessary to get the pump running?
     
    #5 triumph1, Mar 19, 2010
  6. jreed

    jreed Member

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    I haven't tried the Airlift, but according to the Bentley manual you don't need to turn on the pump when vacuum bleeding the coolant.
     
    #6 jreed, Mar 19, 2010
  7. vertex

    vertex Active Member

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    I did it without the vacuum lift, and without running the pump. I filled it up with the bleed port opened and squeezed the large hoses to move the fluid. After it was full, and stayed full after waiting a few minutes, I started the car 7 forced the engine to run until it was warmed up. The fluid went down a little, I topped it off. I checked it the next 2 days, and had to top it off one more time. It has been fine now for 1 year.
     
    #7 vertex, Mar 19, 2010
  8. Scott Caputo

    Scott Caputo Junior Member

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    What is the DLC3? Is that a diagnostic port?
     
    #8 Scott Caputo, Aug 6, 2022
  9. dolj

    dolj Senior Member

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    Yes, it is Toyota's name for the OBD-II port. The acronym stands for Date Link Connector ver 3.
     
    #9 dolj, Aug 6, 2022
    Scott Caputo likes this.
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