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Brake bleeding problem

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by ReshiElderberry82, Jul 29, 2024.

  1. ReshiElderberry82

    ReshiElderberry82 New Member

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    I just replaced the brake pump and actuator on my 2013 toyota prius and i'm having trouble connecting to the unit with scanner tool which is MaxiSys MS906TS. When i try to preform the brake bleeding procedure i get a message that says "Device unable to communicate with the control unit." any help would be greatly appreciated. maybe a different scanner tool or any other suggestions would be a lot of help.

    thanks
     
  2. Tombukt2

    Tombukt2 Senior Member

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    Sometimes this happens You got to make sure if you haven't looked at the factory manual dialogue there's all kinds of things the parking brake has to be down and so on and so forth I don't know whether the aultel system gives you those primers at the beginning of each step or the start of the system whatever so you may need to check that usually when you get that message you haven't done something that needs to be done before you start the whole business.
     
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  3. ReshiElderberry82

    ReshiElderberry82 New Member

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    yeah i think so, i've ordered a new usb cable to make sure its not that. i will check again tomorrow when i get it. the battery 14.76v. i attached a NOCO Boost Plus 12.V 1000A to the battery to make sure the car battery doesn't die. here is a photo of what pops up when it won't connect.
     

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  4. Brian1954

    Brian1954 Senior Member

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    Did you buy a new OEM brake pump and actuator or used parts?
     
  5. ReshiElderberry82

    ReshiElderberry82 New Member

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    i got them off ToyotaPartsDeal. they look brand new but i guess you never know.
     
  6. Tombukt2

    Tombukt2 Senior Member

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    They probably should be brand new I guess that they look like it I see an orange light on your scanner I'm assuming that's not the VCI light I'm assuming you have the VCI light and check mark is green indicating there's communication does your VCI cable or plug not flash green when data's moving or something like that? But there are things that have to be done to the vehicle before all of this works the parking brake has to be down you want to be not ready but in ACC or whatever it is with all the lights on whatever it tells you in the factory manual Chapman or somebody will pop it up here for you in a few minutes and if you don't do all that then highly likely it won't work but I'm thinking that when I had this problem because the parking brake wasn't depressed or something like that it didn't talk about communication problems I don't think but it might have I very quickly figured out that my parking brake wasn't down.
     
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  7. ChapmanF

    ChapmanF Senior Member

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    The orange light on the scanner is tire-warning-shaped, decorated to suggest radio waves. I wonder if this scan tool is one of those you can also use to read your tire pressure sensors.
     
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  8. ReshiElderberry82

    ReshiElderberry82 New Member

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    I wanna thank you guys for your help. i tried it again and i realized that i have to turn the car on and then put the parking brake on then start the procedure. it worked for bleeding the brakes, but i cant go into calibrating the linear solenoid valve because i can't turn the car on (ready off) because the brake lights are on so im assuming the car thinks i have the brake pedal on so when i hit the on button it just cranks like if i had the break pedal down. would that indicate the parts i bought are broke or is there something i can do to fix the issue?

    Again thanks so much for the help. im not very car savvy. up until a few months ago i didn't even change my own oil, but then the head gasket had to be replaced and i did that with some help from people on this forum. now im trying to do this brake pump and actuator, so yeah thank you guys. i really appreciate it the help.

    after i did the brake bleeding these are the codes that are still popping up
     

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  9. ChapmanF

    ChapmanF Senior Member

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    There is a button above the brake pedal that controls the brake lights. When the pedal is released it comes all the way up and pushes the button, and the brake lights are off. When you brake, the pedal moves down away from the button and the lights are on.

    If the released pedal isn't coming up high enough to push the button and turn the lights off, something needs to be adjusted. I'll mention the adjustments in reverse order of likelihood (you'll see why).

    1. (last resort) The button itself is adjustable if needed. You never touched it, so it shouldn't be needed, so only touch this if the steps below haven't fixed the problem.
    2. The brake pedal height when released is adjustable, using the clevis on the cylinder pushrod. The pedal height should be adjusted to the measurement in the drawing below. But only touch this clevis if the step below hasn't fixed the problem.
    3. (First thing to do) Recheck how you mounted the new unit to the firewall. Make sure it is not cockeyed, nothing is stuck in between, holding it away from the firewall. If it came with a gasket to go between the unit and the firewall, make sure the old gasket isn't still stuck on the firewall too.

    Only if you are absolutely sure that the unit is mounted flat down on the firewall where it belongs, then measure the released pedal height as shown in this drawing, and if it isn't right, make it right as described in this post.

    Note the measurement is from the bare metal floor, so the carpet has to be folded back.

    [​IMG]

    Only if you have measured the pedal height and you're sure you've made it correct, and it still isn't pushing the button to turn off the brake lights (this is darned unlikely), then you would adjust the button itself.
     
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  10. ReshiElderberry82

    ReshiElderberry82 New Member

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    Thanks for all the help guys. i really can't take you enough. im gonna try it out in the morning and hopefully i can get it all worked out. i will let you guys know how it goes. really pumped on getting in there tomorrow and getting it fixed.
     
  11. Tombukt2

    Tombukt2 Senior Member

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    Yes I think this a u t e l scanner It's a 906 or something like that is based upon their TPMS software also so it can program there a u t e l TPMS sensors as well as generally strike up relearns and all that with other sensors on various makes and models of cars this series of scanner comes this way It seems like they're touting the TPMS part of the whole scanner more than they are code reading and maintenance which you have to be careful with this brand they make models of each series for homeowner DI wires and then the $4,000 model for the shop with all the plugs and the case and all the nonsense that goes with it.
     
  12. ReshiElderberry82

    ReshiElderberry82 New Member

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    i was able to fix the pedal problem. thanks for your help. Now im stuck with a different problem. i can access the calibration procedure for the linear solenoid valve but it wont actually calibrate it. i tried to erase the memory, but its not doing it. the steps are these. when i do this the abs light does not blink. the lights are always just on. they never blink. then when i try to do the calibration i go through all the steps and the lights are supposed to blink while its doing the procedure, but like i said they never blink.

    the only thing i can think of its maybe im doing the steps wrong. the ignition on/ready off means i press the on button twice with out pressing the brake pedal, correct? and ignition off, ready off means i hit the on button once?
     

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  13. ReshiElderberry82

    ReshiElderberry82 New Member

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    i forgot to mention the codes that are popping up as failed.
     

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  14. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    How much would dealership charge for this? I know, in-for-a-penny, but if it's an hour's labour and you're on your way?
     
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  15. ReshiElderberry82

    ReshiElderberry82 New Member

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    im tempted to just put the old brake actuator and see if it works. when the problem started the car would just show the abs yellow lights on and then eventually the red brake light came on and i would always hear the pump constantly working. im just confused because the brake bleeding went fine so that just seems like the parts work but why cant i calibrate the linear solenoid valve or erase its memory. the scanner tools seems to be doing its thing but the lights on the car don't flash like they're supposed to when its supposedly calibrating the the valve. im just afraid i take it to the shop and they're gonna be like oh you need new parts cause the parts you have are bad.
     
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  16. Tombukt2

    Tombukt2 Senior Member

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    This is a generation 3 right so there are two parts You're replacing just one of the parts what they're going to tell you is the part that you can't mess with is failed and you should be replacing that too more than likely unless that piece contains the part you're trying to calibrate in it I don't know what part has what in it in my generation to the linear valve offset doodad I think is in the one and only break actuator that we have in your car they've split this up I'm sure for monetary reasons that's usually what it's always about I would love to see if that winds up being the answer they should be able to tell you if you tell them the real story I came and I bought the one part because I heard hissing whatever Don't try to sneak in any or leave out anything on purpose you know what I mean Right And then see if the guy immediately comes out of his mouth with oh well that's because this part that has the actual piece in it that you're trying to calibrate is still in the car and now this piece when you add it or whatever the story might be they may not even charge you for that if you go over there and talk to somebody in front of them you'd be surprised catch a tech on lunch offer to buy him lunch whatever I'm sure maybe the factory manual for this model might talk about some of this I'm sure the section is very lengthy
     
  17. ChapmanF

    ChapmanF Senior Member

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    You have C1451, the code that locks out the system from operating until you complete the bleed procedure with a suitable scan tool. That leaves you pretty much one choice for the next step to take.

    The other steps should work better after that.
     
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  18. ReshiElderberry82

    ReshiElderberry82 New Member

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    Im guessing something went wrong during the brake bleeding procedure? im gonna try it in the morning and see what happens. i have nothing to lose. fingers crossed!!!
     
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  19. ReshiElderberry82

    ReshiElderberry82 New Member

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    Hey guys wanted to give an update and thank everyone for all the help. The reason why i couldn't calibrate the linear solenoid valve is because the site i ordered from sent a similar part but its not compatible with my car. They sent the wrong part and won't take responsibility for it. I'm going to order the part from toyota this time and we'll see if it can be fixed. Again thanks for everyones help.
     
  20. ASRDogman

    ASRDogman Senior Member

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    I hope you are returning it. And if they won't take it, call your credit card...
    They will stop payment on it.
    I hope the correct part will resolve the issue.


     
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