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Error bleeding brake acculumator after replacement

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by virulentspores, Apr 24, 2018.

  1. virulentspores

    virulentspores New Member

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    Hopefully someone has seen this before and can lend some insight..

    Replaced brake accumulator
    Using TIS 12.10.0.019 if I try to bleed the accumulator it fails immediately with the below error.
    All of the active tests associated with the accumulator also fail.
    [​IMG]


    As a test I swapped the old accumulator back in and get the same error.
    Anyone have thoughts? I haven't backprobed the harness to see if I have voltage from the emergency capacitor brake box.

    I can try upgrading to a newer version of TIS but I'm at a loss here. Anyone have ideas?
     
    #1 virulentspores, Apr 24, 2018
  2. SFO

    SFO Senior Member

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    Welcome to PriusChat!!

    Might try downgrading a couple of versions instead.

    Try 10.30.029 and see if that works.
     
    #2 SFO, Apr 24, 2018
    Raytheeagle likes this.
  3. virulentspores

    virulentspores New Member

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    I'll give that a try, had a hard time finding a good copy of 10.30.029 but finally tracked one down. I'll post back with the results good or bad.
     
    #3 virulentspores, Apr 26, 2018
    Raytheeagle and SFO like this.
  4. virulentspores

    virulentspores New Member

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    No luck, tried 9. Something, 10.30.029 and a new mvci cable and nothing.. I'm wondering if the brake capacitor module is hosed.

    None of the active tests for the accumulator work.
     
    #4 virulentspores, Apr 26, 2018
  5. Patrick Wong

    Patrick Wong DIY Enthusiast

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    As you know, this bleeding process happens when the car is IG-ON, which means the 12V battery is being heavily drained by the vehicle electronics. Is the battery fully-charged? Measure the voltage across the battery while the car is IG-ON.

    If the battery voltage is low, it may help to supplement the battery voltage by using a battery charger.
     
    #5 Patrick Wong, Apr 27, 2018
  6. virulentspores

    virulentspores New Member

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    I've tried both with the car in ready mode and just IG-ON after confirming the 12v battery has a charge.
    To add to this I have occasionally gotten a DTC C1377 so I'm wondering if something is flaking out with the capacitor/emergency unit.
    I have checked voltage input/output at the capacitor per the troubleshooting manual and it was to spec but maybe it can't handle the current draw of the accumulator bleeding? I'm out of ideas.
     
    #6 virulentspores, Apr 27, 2018
  7. virulentspores

    virulentspores New Member

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    #7 virulentspores, Apr 27, 2018
  8. virulentspores

    virulentspores New Member

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    As I dislike when a questions is asked and there's never follow-up on a solution.....

    The fix:
    Set the car on fire and pushed it off a cliff (kidding)

    Replace the following:
    Replaced the brake capacitator
    Replace the skid control ECU
    Started seeing error codes
    C1352 inf 11 and C1355. Ran through pinouts and started testing continuity; found broken wires inside the harness SLAFR+ and SLARL+ and SMC2 were bad or damaged were the accumulator sub harness enters the main wiring harness by the firewall. Once these were repaired I was able to bleed the car correctly.
     

    Attached Files:

    #8 virulentspores, May 21, 2018
    thejoyandthepain, Raytheeagle, dolj and 2 others like this.
  9. thejoyandthepain

    thejoyandthepain New Member

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    I am having this same original symptom. I just replaced the accumulator from a donor vehicle. It was hard and way beyond my mechanical aptitude!!!

    But, it is mostly back together and the bleeding process fails almost immediately at the OP's screen.

    I left in on the battery charger while I am at work today, so I hope to be able to rule out a low 12V battery. It was drawing a lot of current and has been sitting for over a week, and the accumulator was running a lot.

    I'm definitely interested if there are any other suggestions. I'll beep out the wiring harness if it comes to that.
     
    #9 thejoyandthepain, Feb 26, 2019
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