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Changed out ABS Actuator now Prius won't shut off :>(

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Tynyyn, Oct 27, 2022.

  1. Tynyyn

    Tynyyn Member

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    .
     
    #21 Tynyyn, Nov 4, 2022
    Last edited: Nov 4, 2022
  2. Tynyyn

    Tynyyn Member

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    I was hoping someone would look at the last post on page one of this thread and read the techstream pics I posted and see what they can interpret. Thanks.
     
  3. ChapmanF

    ChapmanF Senior Member

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    You haven't posted the rest of the freeze frames. Notice there's a scroll bar across the bottom, and the last thing showing in your photos is the front right wheel speed, but nobody can see what the other three wheels were doing.

    You haven't mentioned how you got to 55 MPH up on blocks without the traction control noticing the front and rear wheels going different speeds. Did you disable it?

    Can you say more about hitting the gas and stomping on the brake as a way to purge air out of the system? Did you encounter some posting or video or whatever somewhere advocating that?
     
  4. Tynyyn

    Tynyyn Member

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    This is the YT vid I watched to help me burp the air out of the lines when the ABS actuator is not working properly due to air build up in the lines. I'm sure it isn't the "best" way to bleed the air, but I thought I'd give it a try. Now, remember, this guy drove his vehicle around a field and stomped on the brakes. My Prius is up on blocks, so I put the car into "Drive" and depressed the gas pedal. The rpms on the dash registered 55mph. Once I achieved that speed I depressed the brake pedal (i.e. stomped on the brakes). I did this a few times to see if the air would bleed out of the lines. I did not check crack open the lines because it was too late in the day to go through the entire brake bleed process. But I did capture the screen shots. I now understand what ChapmanF was talking about when he said he could only see a partial screen shot. But, for some unknown reason, while my Prius is up on the blocks the 12V battery is drained of all power. At this moment I am currently charging the battery and have commitments this morning so I won't be able to capture the entire screen shots until this afternoon. I do know that with nothing on and the hatch open I can visually watch my hand held electrical meter drop in voltage. It goes very quickly, I must say. So, I'll charge up the battery and then take some screen shots.
     
  5. ChapmanF

    ChapmanF Senior Member

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    Oh man, wow. Back before youtube, a person would have to work really hard to find anything that uninformed. I'm sorry you stumbled on it.

    Even that guy mentioned in the first minute that he can do it "one of a couple different ways" and that one of them is to use the scan tool and tell the car to bleed the brakes. Your screenshots show that you have Techstream, so yeah, that's the way to go. The brake ECU knows how to bleed the air out. The Daninator does not.

    It's kind of amazing the things that guy assumes. He assumes that the valve-opening sequence used by the ECU in the brake bleeding process is the same sequence used when ABS is triggered while driving. He assumes driving and skidding in a field and spinning and stopping the wheels on blocks make the same ABS triggering conditions. And he assumes that if triggering ABS moves some air around, the air will then come out at the caliper ends of the lines.

    And of course if you follow to the end of the video, by the time he really gets the brakes working ... he used the scan tool and the bleed process.

    That video could have been a lot shorter....
     
  6. Tynyyn

    Tynyyn Member

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    DTC c1256

    20221104_163008.jpg

    20221106_134428.jpg

    DTC c1391

    20221104_163116.jpg

    20221106_134634.jpg


    This is the right side pics of the dtc screen in techstream. Sorry it took me so long to reply but the learning curve to understand techstream is steep and I'm a noob. Hope these help.
     
  7. ChapmanF

    ChapmanF Senior Member

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    I would have to guess that C1391 was not stored while your car was up on blocks, given that all 4 wheels were clocked at 55 MPH, and your car isn't 4WD.

    With INF code 591, that code indicates either that the accumulator pressure doesn't rise when the pump is running, or that it falls unreasonably quickly when the pump is not running. Because the pump is not running in that freeze frame, I would guess it's the latter condition that triggered the code.
     
  8. Tynyyn

    Tynyyn Member

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    Well, I went out to the Prius with my techstream in tow thinking I could clear the codes and begin again. Hooked the computer wire into the obd2 port and started looking for the button/tab which says "reset codes". Didn't find that option so I unplugged the computer from the obd2 port and used the paper clip option. Inserted the paper clip into the obd2 plug, turned the Prius on, the engine started and depressed the brake pedal so the axle would not spin. This was done while the paperclip was in the obd2 port. I shifted the transmission between Park, drive and reverse a couple of times. I then noticed smoke coming from the area of the dash where the dash lights appear. I shut down the Prius completely. Went to the engine bay to look for the location where the smoke originated. Sniffing on top of the inverter I did not smell smoke. Even poked my nose deep under the cowel where the accumulator connector is located and I did not smell smoke. But, to the left of the inverter, near the spark plug rail I did smell smoke, but I did not see any smoke. This could have been a light bulb within the dash lights getting hot. IDK, I just turned off the car and went inside of my house, frustrated.
     
  9. ChapmanF

    ChapmanF Senior Member

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    When you noticed the smoke, did it seem to be on the inside of the windshield or the outside?
     
  10. Tynyyn

    Tynyyn Member

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    Inside. Small whisps barely visible but there.
     
  11. Tynyyn

    Tynyyn Member

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    I cleared the DTC's. Reran the code reading function in the Techstream and this is what I got for DTC's. c1256 appeared and the c1391 disappeared. Wonder if the Prius is getting "better". hehe Now I got to figure out what detail freeze 141 corresponds to.

    I'm getting used to piddling with the Techstream, but at the same time I feel that if I push the wrong command bad mojo could erupt underneath the hood of my Prius.

    I also noticed the drivers side front window will go up and when it hits the top stop the window will move down about three inches. Something is wonky with that.




    20221107_140305.jpg





    20221107_135944.jpg








    20221107_140005.jpg
     
  12. dolj

    dolj Senior Member

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    It just needs to learn the correct 'home' position. Lower the window to halfway, then raise it to the top and hold the switch in the 'up' position for a further 5 seconds after reaching the closed (home) position. If that doesn't work remove the 12 V power for 10 seconds then reconnect and try the reset procedure again.
     
  13. Tynyyn

    Tynyyn Member

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    After clearing the codes and retesting this is the fault codes that appeared:

    c1252
    c1256
    c1345

    After pondering the readings I'm thinking the problems lie in two areas. One, the accumulator is bad. Flat out bad and its not working like it should. And the next is a connection problem. Maybe I missed a connector and that's what's causing the wonky DTC codes. So tomorrow I'm going out and pulling the inverter and see what might lie underneath. Do some poking around and hopefully I'll find two ends that were not connected together.

    Thanks dolj for helping with the window problem. I did your "trick" and it worked out nicely. I appreciate your input.
     
  14. dolj

    dolj Senior Member

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    Alas, it is not my trick. That comes straight from the repair manual and I am fairly sure it is also in the owner's manual.
     
  15. ChapmanF

    ChapmanF Senior Member

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    Why 'alas'? I might even say "Rejoice! For it is not my trick, but in the repair manual, that all may find it!"
     
  16. dolj

    dolj Senior Member

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    Whilst it is cause for rejoicing the alas is that the glory is not mine in which to bask for, as you point out, it is in the repair manual, that all may find it!