Bad combo meter —> linear valve offset fail? hypothetically…

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Phaul80, Jun 18, 2025 at 1:02 PM.

  1. Phaul80

    Phaul80 Junior Member

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    my combo meter is bad and went from intermittent to totally gone while doing this brake work in the driveway over the last week or so. Since the lights blink rapidly during the linear valve offset process, the skid control ecu is sending a signal to the dash. could there be an error between those two ecus that causes my 1345 and 1368 dtc’s?

    i swapped in a ebay abs actuator i got from partsbravo. i also replaced all brake components on the front end - flex hose, calipers, rotors and pads.

    the pads were extremely uneven, and the caliper piston was seized.. even after removal and emptying the fluid via banjo bolt, it took more than a little effort with a caliper piston tool to make it budge, let alone seat itself back in the caliper.

    now here’s the other issue- and maybe more telling. when installed the new brake parts, the wheels moved freely. after the air bleed, the new pads are clamped on the rotors, ie the fluid is not being sent back upstream. thats gotta be the used actuator with a bad valve/solenoid/whatever and im about to rip it out and send it back

    But… hypothetically, could a bad combo meter send errors to the skid ecu becuase the lights arent showing up on the dash?
     
    #1 Phaul80, Jun 18, 2025 at 1:02 PM
  2. Tombukt2

    Tombukt2 Senior Member

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    I don't know I wouldn't put put too much stock on the combination meter clamping my brakes because the skid ECU can't see something or there's miscommunication between ecu's I would think it would refer to some default mode under conditions like said . Not just clamp up and hold . I check that caliper make sure it is releasing when there's no pressure there just to be sure especially anything that I had to wrestle apart
     
    #2 Tombukt2, Jun 18, 2025 at 3:01 PM
  3. dolj

    dolj Senior Member

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    The best idea would be to read the codes. If there were problems with the CM, you would see codes for it.

    C1345 – Linear Solenoid Valve Offset Learning Undone
    C1368 – Linear Solenoid Valve Offset Malfunction

    There are 4 sub-codes for C1345 – 501, 502, 503, and 504 that will tell you for which corner of the car the value of initialization of linear solenoid valve and calibration is not stored

    The C1368 indicates initialization of the linear solenoid valve and calibration is undone.

    It would seem the learning process failed.

    That could implicate the ABS actuator unit as being suspect if the process continually fails to calibrate.
     
    #3 dolj, Jun 18, 2025 at 11:16 PM
  4. Tombukt2

    Tombukt2 Senior Member

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    But these weren't the codes you had initially when you started on this journey I'm guessing. Did you just buy default go and try n lean linear v offset ? Did you clear out what's stored first . But why did you do this just because usuall wen I'm using used part I do not touch that screen at all I til after all bleeding is complete and cars stopping like supposed to more or less . Usually with a used actuator I don't even have to touch that setting . But I also have not cleared or unlearned anything either.
     
    #4 Tombukt2, Jun 19, 2025 at 12:27 AM
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