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ABS, Brake and Traction lights on with codes C1252, C1253, C1256, C1365

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by kamrul, Apr 18, 2023.

  1. Midnight2065

    Midnight2065 Junior Member

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    I will pass the information along. We assumed that it wasn't getting power in some fashion because we unplugged the new brake assembly w/ master cylinder and plugged back in the old one to see if maybe the part was defective and it didn't click/respond in any way. He said would of heard it at least buzz.
     
    #21 Midnight2065, May 8, 2023
    Last edited: May 8, 2023
  2. ChapmanF

    ChapmanF Senior Member

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    Well, the buzzing sound is made by the motor, so the motor fuses would affect that. Of course fuses are dead simple to check, shouldn't need to tell a mechanic how to do that.

    How about other signs of the unit receiving power, other than power to the motor? Do any of its three lights on the dash light up? Does it appear in a scan tool's list of responding ECUs?
     
  3. Midnight2065

    Midnight2065 Junior Member

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    So it was only that 30/30/40 amp he wasn't sure if maybe there was something we couldn't see at a quick glance and was causing the issue. We were doing this in my driveway and just didn't have a mechanic shop to quickly assess certain things. Turns out... it was the 12v after all. We picked up a new 12v and fuses to diagnose and got back to it today and sure enough when we opened the door to the prius, we heard the pump click. That said, we determined the 12v must be dying. Needless to say, halfway through the bleed cycle and it went out. A quick swap allowed us to finish the job. So yeah, a bad 12v will throw everything out of whack, but thankfully now all the lights and beeping have gone away and the car is fully operational without incident.
     
  4. Tbkilb01

    Tbkilb01 Active Member

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    Have you checked your accumulator voltage using scan tool? HVe you Heard or seen any signs of leakage of fluid or air under dash at brake pedAl I just worked on accumulator not too long ago... I just went after accumulator not both units ...I heard and saw leakage tho at master cylinder. Used live data to find the culprit...
     
    #24 Tbkilb01, May 9, 2023
    Last edited: May 9, 2023
  5. kamrul

    kamrul Junior Member

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    So since I am driving the Prius like that - the accumulator pump running every now and then plus the "sssshh-ssshhh" noise coming from the brake pedal whenever it is pressed at a moderate speed but no dashboard lights reappearing just yet, is it ok to keep continue to drive?
     
  6. ChapmanF

    ChapmanF Senior Member

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    The sssshh-ssshhh indicates gas bubbles in the system that it would be worthwhile to bleed out. Removing the bubbles reduces the amount of brake fluid that has to be moved on every use of the brake, and that should increase the brake uses between runs of the pump.

    Excessive gas bubbles in the system may also, I've speculated, contribute to a rare but bad situation where the system's fail-safe mode ... isn't.
     
    kamrul likes this.
  7. Midnight2065

    Midnight2065 Junior Member

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    So all was fine for a week but just earlier the abs lights and beeping all started again. I noticed my brake fluid was near empty just now? Should I be able to see fluid and could that possibly be the culprit?
     
  8. kamrul

    kamrul Junior Member

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    Hi @ChapmanF , thank you for all the input you have given to this thread. I really appreciate it. I have been a bit away lately.

    So a couple of months of running fine with no lights and brakes behaving normally, I have got the lights on again while driving. It went off momentarily but appeared soon after and has stayed that way. I haven't scanned but I assume that I need to replace the brake booster pump aka, the accumulator. I just hope I still get the same codes like before that indicated that the brake booster assembly aka, the actuator or the master cylinder aka, the more expensive part is still fine :)

    I have spoken to a different mechanic and he has informed me that there needs to be some adjustment or calibration (probably in the ECU) when the pump is replaced be it with brand new or used. Otherwise, the parts (newly installed accumulator and existing actuator) may not be in sync and may cause a reason for the actuator to malfunction sooner than expected. Do you have any idea about what's he suggesting?
     
    #28 kamrul, Sep 17, 2023
    Last edited: Sep 17, 2023
  9. ChapmanF

    ChapmanF Senior Member

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    If you are assuming because you do not have a scan tool ready at hand, you should be able to get the codes anyway, like this:

    Blink (a/k/a Flash) Codes – How to. | PriusChat

    Then you don't have to assume.

    Replacing the components will require a scan tool that is capable of stepping the brake computer through the fluid bleed process. I believe most scan tools that can do that can also call up the other calibration procedures that may be needed. There are only a few, and I believe the one for the linear solenoid offset is done automatically as part of the long-form bleed procedure anyway.
     
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  10. kamrul

    kamrul Junior Member

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    Thanks for the reply @ChapmanF

    I scanned again and the codes are still C1252, C1253, C1256, C1365


    This is a great share and definitely, I might need it someday. Thanks.
     
  11. kamrul

    kamrul Junior Member

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    Is there any way however to check if the Actuator is faulty even though there is no C1391 yet that represents an abnormal leakage?
     
  12. kamrul

    kamrul Junior Member

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  13. kamrul

    kamrul Junior Member

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