ABS

Discussion in 'Gen 3 Prius Main Forum' started by kalum, Apr 30, 2020.

  1. kalum

    kalum Junior Member

    Joined:
    Sep 24, 2014
    31
    5
    0
    Location:
    srilanka
    Vehicle:
    2013 Prius
    Model:
    N/A
    Hi
    2013 Prius with 73,000 miles. The ABS and Brake lights are lit up on the dash, brake pedal goes all the way.
    i have error code .[​IMG] My mechanic wants to replace the abs pump unit.as per my mechanic i should buy a unit with letter RA (i want to buy a recondition one from ebay) pls advice me is this the correct trouble shooting and what is the meaning of this RA[​IMG]
     

    Attached Files:

  2. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    15,241
    10,606
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    You've got a code there about the pump motor not running, two about the pressure being off (perhaps because the pump motor isn't running), and one about a relay that's responsible for making the pump motor run.

    I would kind of want somebody with a multimeter to follow up that last angle before replacing an expensive and difficult part. I would feel sheepish after that much effort and expense if it still didn't work, and then turned out to be a relay or wiring.

    Do you hear the brake pump running from time to time?
     
  3. kalum

    kalum Junior Member

    Joined:
    Sep 24, 2014
    31
    5
    0
    Location:
    srilanka
    Vehicle:
    2013 Prius
    Model:
    N/A
    Thank you for the reply
    .pump is not running and relay is good. Is it look likes pump replacement?.
    Why he is mentioned letter RA should be with the pump.as per him there are pumps with letter EA,EB,EE they does not match with my car
    Thank you
     
  4. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    15,241
    10,606
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    If the pump is not running, and it were my car, I would first make sure the problem is not the relay, and not the wiring from the relay to the pump, and not the wiring from the power source to the relay, and not the wiring from the pump to ground. If I had ruled out all of those possibilities, then I would spend the money and effort on the pump.

    If you are confident that all of those possibilities have been correctly ruled out, then the pump would be what's left. If you are not confident the other possibilities have all been correctly ruled out, then they would be worth checking.

    You could look up the detection condition for C1253 to see why the ECU might have flagged the relay with the relay being good.
     
  5. kalum

    kalum Junior Member

    Joined:
    Sep 24, 2014
    31
    5
    0
    Location:
    srilanka
    Vehicle:
    2013 Prius
    Model:
    N/A
    thanks

    I will update you
     
    Mollyisadog likes this.
  6. BZzap!

    BZzap! Senior Member

    Joined:
    Jun 13, 2012
    1,607
    867
    0
    Vehicle:
    2012 Prius
    Model:
    Two
    Far too often, mechanics ( technicians) tend to use a code scanner as an absolute, well not bothering to properly diagnose the underlying problem. Time is money and diagnosis can be time consuming. So, they start throwing parts at the problem.
    My first train of thought would be to test the circuit by checking the the powers and grounds at the relay. Just because the relay clicks or you can hear it, doesn’t mean the relay is good. The important thing is to determine if the LOAD side of the relay is completing the circuit to the motor. If you can determine that the load is being supplied to the motor and the motor does not run, then you can verify that there is a bad motor or an open in the circuit somewhere beyond the relay.
     
  7. varun singh

    varun singh Member

    Joined:
    Aug 14, 2014
    113
    20
    0
    Location:
    Wayzata
    Vehicle:
    2011 Prius
    Model:
    Four
    Check with Toyota, you may be eligible for brake booster pump replacement
     
  8. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    15,241
    10,606
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    It would still be too bad if they changed the pump and it wasn't the problem. Sure, you'd have a new pump out of the deal, but also delay and frustration.
     
  9. varun singh

    varun singh Member

    Joined:
    Aug 14, 2014
    113
    20
    0
    Location:
    Wayzata
    Vehicle:
    2011 Prius
    Model:
    Four
    Oh that would be the part where toyota would diagnose :)

    most of the codes OP mentioned were mentioned in old brake booster ZJB program

    C1391, C1252, C1256 or C1253
     
  10. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    15,241
    10,606
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    Sure, but that doesn't change what the codes mean, or the need to diagnose what is causing them.

    Oddly enough, a code about a relay or power supply to a pump can at times turn out to be there because of a relay or power supply problem. Even if it was listed in a service campaign as possibly appearing in connection with a bad actuator (ZJB was about an actuator internal leak), just blindly replacing an actuator in that case would result in an unsolved problem.

    Sure, the dealer at that point would probably just hold on to the car and begin the actual diagnosis that should have happened first, and eventually return the car to you when they have found the real problem and fixed it. As long as there's another car or a loaner to use while that's happening, it's fine.

    If the cause turned out not to be the actual internal leak addressed in the ZJB program, the work might not all be cost-free.
     
  11. Christopher Marble

    Christopher Marble New Member

    Joined:
    May 27, 2020
    1
    0
    0
    Location:
    Washington
    Vehicle:
    2012 Prius c
    Model:
    One
    Before you do anything first have them check the connection at the abs pump first. Its a 2 plug connector. What happened to mine was the abs pump rattled loose causing the lights on the dash to come on. I bought the brake pedal actuator for my 2014 prius c
     
  12. Mollyisadog

    Mollyisadog New Member

    Joined:
    Mar 22, 2021
    16
    1
    0
    Location:
    Virginia, USA
    Vehicle:
    2013 Prius
    Model:
    N/A
    What fixed it?