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Need help-pump -pump not running during ABS bleed

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Seymour1, Jun 30, 2024 at 8:35 AM.

  1. Seymour1

    Seymour1 Junior Member

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    I have a new pump and actuator installed. 2 weeks ago, I bled brakes the old school way. I had no scanner. Now I have T S and when I bleed the front brakes, the pump does not run and fluid comes out slowly. And when I opened the valve on the stroke simulator, no fluid came out and no air and the pump does not run. The other end of the hose is submersed and there were no air bubbles. I am doing this alone and use a 2x4 to hold down the petal after I pump the brakes.
    What am I doing wrong?
     
    #1 Seymour1, Jun 30, 2024 at 8:35 AM
  2. Seymour1

    Seymour1 Junior Member

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    I did get "lost communications" 2 times. But, does the T S tell the pump to run or does T S only tell me the steps (one way communications) for this step? I have a battery charger on the 12 volt battery. Maybe I have a crappy cable.
    And I read a post where someone said that without fluid in the stroke simutator, it could be damanged if I drive the car much. I have driven no mire than 25 miles.
     
    #2 Seymour1, Jun 30, 2024 at 8:54 AM
  3. Seymour1

    Seymour1 Junior Member

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    I am running T S ver 12-20-024 which is old. Should I try another version if I can find it and able to set it up?
    My brake codes are C1203, C1336, C1345, and C1451. My battery voltahe has stayed over 12.0 volts.
    I have seen others post the same problem, but with no direct answers. I will keep looking.
     
    #3 Seymour1, Jun 30, 2024 at 9:15 AM
  4. ChapmanF

    ChapmanF Senior Member

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    There are two different fluid paths serving the front brakes, and the scan tool bleed procedure has to bleed both paths. The on-screen instructions will step you through bleeding both front brakes, then later instructions will take you to the front brakes again. It seems weird but that's how it works.

    One path can be bled using the electric pump. The other path can only be bled by you pumping the brake pedal, as when bleeding an old car. I think the pedal-only step is the first one and the pump-powered step is the second time through, but I haven't done it in a while.

    The diagram looks like the accumulator doesn't feed the stroke simulator, so I wouldn't expect any pump assist while bleeding that.

    [​IMG]

    The C1451 code you have (with the weird fortune cookie "motor drive permission malfunction") is there to prohibit the pump motor from running under almost all circumstances. Going through the bleed procedure to the end is the only way to make that code go away, and then the pump will run all the usual times. Until then, it should only run at the few times the bleed procedure itself requires.
     
    #4 ChapmanF, Jun 30, 2024 at 9:35 AM
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