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ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1341/62, C1342/63, C1343/64, C1344/65

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DTC Code DTC Name
C1341/62 Front Hydraulic System RH Malfunction
C1342/63 Front Hydraulic System LH Malfunction
C1343/64 Rear Hydraulic System RH Malfunction
C1344/65 Rear Hydraulic System LH Malfunction
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DESCRIPTION

The skid control ECU assembly controls braking force according to the hybrid control system regenerative braking force and provides the hydraulic pressure necessary for operating each wheel cylinder according to the wheel cylinder pressure sensor.

DTCs may be stored if one of the following occurs:


DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1341/62 Front Hydraulic System RH Malfunction

551

552

553

554

555

  • INF Code: 551


    • Decrease in FR wheel hydraulic pressure control performance.

      (Pressure increase malfunction)

  • INF Code: 552


    • Decrease in FR wheel hydraulic pressure control performance.

      (Pressure decrease malfunction)

  • INF Code: 553


    • Malfunctions such as leaks occur in the FR wheel pressure increase control valve.

  • INF Code: 554, 555


    • Malfunctions such as leaks occur in the FR wheel pressure decrease control valve.

  • INF Code: 551, 552


    • Brake fluid leaks

    • Brake actuator assembly

  • INF Code: 553, 554, 555


    • Brake fluid leaks

    • Brake disc rotor excessive wear

    • Brake actuator assembly

 Electronically controlled brake system DTC
C1342/63 Front Hydraulic System LH Malfunction

561

562

563

564

565

  • INF Code: 561


    • Decrease in FL wheel hydraulic pressure control performance.

      (Pressure increase malfunction)

  • INF Code: 562


    • Decrease in FL wheel hydraulic pressure control performance.

      (Pressure decrease malfunction)

  • INF Code: 563


    • Malfunctions such as leaks occur in the FL wheel pressure increase control valve.

  • INF Code: 564, 565


    • Malfunctions such as leaks occur in the FL wheel pressure decrease control valve.

  • INF Code: 561, 562


    • Brake fluid leaks

    • Brake actuator assembly

  • INF Code: 563, 564, 565


    • Brake fluid leaks

    • Brake disc rotor excessive wear

    • Brake actuator assembly

 Electronically controlled brake system DTC
C1343/64 Rear Hydraulic System RH Malfunction

571

572

573

574

575

  • INF Code: 571


    • Decrease in RR wheel hydraulic pressure control performance.

      (Pressure increase malfunction)

  • INF Code: 572


    • Decrease in RR wheel hydraulic pressure control performance.

      (Pressure decrease malfunction)

  • INF Code: 573


    • Malfunctions such as leaks occur in the RR wheel pressure increase control valve.

  • INF Code: 574, 575


    • Malfunctions such as leaks occur in the RR wheel pressure decrease control valve.

  • INF Code: 571, 572


    • Brake fluid leaks

    • Brake actuator assembly

  • INF Code: 573, 574, 575


    • Brake fluid leaks

    • Brake disc rotor excessive wear

    • Brake actuator assembly

 Electronically controlled brake system DTC
C1344/65 Rear Hydraulic System LH Malfunction

581

582

583

584

585

  • INF Code: 581


    • Decrease in RL wheel hydraulic pressure control performance.

      (Pressure increase malfunction)

  • INF Code: 582


    • Decrease in RL wheel hydraulic pressure control performance.

      (Pressure decrease malfunction)

  • INF Code: 583


    • There is a malfunction or leak in the RL wheel pressure increase control valve.

  • INF Code: 584/585


    • There is a malfunction or leak in the RL wheel pressure decrease control valve.

  • INF Code: 581, 582


    • Brake fluid leaks

    • Brake actuator assembly

  • INF Code: 583, 584, 585


    • Brake fluid leaks

    • Brake disc rotor excessive wear

    • Brake actuator assembly

 Electronically controlled brake system DTC
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WIRING DIAGRAM

Refer to DTCs C1246/46 and C1364/61.

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CAUTION / NOTICE / HINT

Note:

When replacing the brake actuator assembly, perform initialization and calibration of the linear solenoid valve.

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Tip:

When C1364/61 is output together with C1341/62, C1342/63, C1343/64 and/or C1344/65, inspect and repair trouble areas indicated by C1364/61 first.

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PROCEDURE


  1. Click here

    CHECK FOR FLUID LEAK


    1. Check that there are no fluid leaks in the brake lines between the brake actuator assembly and the wheel cylinders.

    2. Check that the brakes are not dragging.

      OK
      There are no fluid leaks or dragging.
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE APPLICABLE PART

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    PERFORM AIR BLEEDING


    1. Bleed the air from the front and rear brake systems.

      Click here

      Result
      Proceed to
      NEXT

  3. Click here

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY AND BRAKE ACTUATOR ASSEMBLY - BODY GROUND)


    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    2. Disconnect the A24 and A25 skid control ECU assembly connectors.

    3. Disconnect the A16 brake actuator assembly connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Table 1. for LHD
      Tester connection Condition Specified condition
      A24-28 (E) or A16-45 (E) - Body ground Always 10 kΩ or higher
      A24-27 (VCM) or A16-35 (VCM) - Body ground Always 10 kΩ or higher
      A24-42 (PRL) or A16-36 (PRL) - Body ground Always 10 kΩ or higher
      A24-26 (PAC1) or A16-46 (PAC1) - Body ground Always 10 kΩ or higher
      A24-14 (PMC1) or A16-38 (PMC1) - Body ground Always 10 kΩ or higher
      A24-9 (PCK1) or A16-37 (PCK1) - Body ground Always 10 kΩ or higher
      A24-44 (PFR) or A16-34 (PFR) - Body ground Always 10 kΩ or higher
      A25-44 (E2) or A16-44 (E2) - Body ground Always 10 kΩ or higher
      A25-28 (VCM2) or A16-40 (VCM2) - Body ground Always 10 kΩ or higher
      A25-45 (PFL) or A16-39 (PFL) - Body ground Always 10 kΩ or higher
      A25-43 (PRR) or A16-41 (PRR) - Body ground Always 10 kΩ or higher
      A25-14 (PMC2) or A16-43 (PMC2) - Body ground Always 10 kΩ or higher
      A25-7 (PCK2) or A16-42 (PCK2) - Body ground Always 10 kΩ or higher
      Table 2. for RHD
      Tester connection Condition Specified condition
      A24-28 (E) or A16-14 (E) - Body ground Always 10 kΩ or higher
      A24-27 (VCM) or A16-10 (VCM) - Body ground Always 10 kΩ or higher
      A24-42 (PRL) or A16-11 (PRL) - Body ground Always 10 kΩ or higher
      A24-26 (PAC1) or A16-15 (PAC1) - Body ground Always 10 kΩ or higher
      A24-14 (PMC1) or A16-13 (PMC1) - Body ground Always 10 kΩ or higher
      A24-9 (PCK1) or A16-12 (PCK1) - Body ground Always 10 kΩ or higher
      A24-44 (PFR) or A16-9 (PFR) - Body ground Always 10 kΩ or higher
      A25-44 (E2) or A16-16 (E2) - Body ground Always 10 kΩ or higher
      A25-28 (VCM2) or A16-5 (VCM2) - Body ground Always 10 kΩ or higher
      A25-45 (PFL) or A16-4 (PFL) - Body ground Always 10 kΩ or higher
      A25-43 (PRR) or A16-6 (PRR) - Body ground Always 10 kΩ or higher
      A25-14 (PMC2) or A16-8 (PMC2) - Body ground Always 10 kΩ or higher
      A25-7 (PCK2) or A16-7 (PCK2) - Body ground Always 10 kΩ or higher
      Result
      Result
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. Click here

    READ VALUE USING GTS (WHEEL CYLINDER PRESSURE SENSOR)


    1. Reconnect the A24 and A25 skid control ECU assembly connectors.

    2. Reconnect the A16 brake actuator assembly connector.

    3. Connect an LSPV gauge set.

    4. Connect the GTS to the DLC3.

    5. Turn the power switch on (IG).

    6. Select the Data List on the GTS.

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      1. Chassis > ABS/VSC/TRC > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        FR W/C Sensor Front wheel cylinder pressure sensor RH Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.30 to 0.70 V Reading increases when brake pedal is depressed
        FL W/C Sensor Front wheel cylinder pressure sensor LH Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.30 to 0.70 V Reading increases when brake pedal is depressed
        RR W/C Sensor Rear wheel cylinder pressure sensor RH Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.30 to 0.70 V Reading increases when brake pedal is depressed
        RL W/C Sensor Rear wheel cylinder pressure sensor LH Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.30 to 0.70 V Reading increases when brake pedal is depressed






      1. Chassis > ABS/VSC/TRC > Data List
        Tester Display
        FR W/C Sensor
        FL W/C Sensor
        RR W/C Sensor
        RL W/C Sensor







    7. Check the output values of the wheel cylinder pressure sensor at each hydraulic pressure level during the electronically controlled brake system control.

      Tip:

      Read Calibration ID using the GTS.

      Standard Voltage (Calibration ID: F1526-53182 and F1526-53192)
      Table 3. for Front Wheel Cylinder (for Type A Front Brake)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Tester Display)

      FL W/C Sensor

      (Tester Display)
      3.61 (36.8, 524) 1.04 to 1.44 V 1.04 to 1.44 V
      5.36 (54.7, 777) 1.39 to 1.79 V 1.39 to 1.79 V
      Table 4. for Front Wheel Cylinder (for Type B Front Brake with Solid Type Rear Disc)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Tester Display)

      FL W/C Sensor

      (Tester Display)
      3.58 (36.5, 519) 1.03 to 1.43 V 1.03 to 1.43 V
      4.77 (48.7, 692) 1.28 to 1.68 V 1.28 to 1.68 V
      Table 5. for Front Wheel Cylinder (for Type B Front Brake with Ventilated Type Rear Disc)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Tester Display)

      FL W/C Sensor

      (Tester Display)
      3.09 (31.5, 448) 0.93 to 1.33 V 0.93 to 1.33 V
      4.85 (49.5, 703) 1.29 to 1.69 V 1.29 to 1.69 V
      Table 6. for Rear Wheel Cylinder (for Type A Front Brake)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Tester Display)

      RL W/C Sensor

      (Tester Display)
      3.71 (37.9, 538) 1.06 to 1.46 V 1.06 to 1.46 V
      5.39 (55.0, 782) 1.40 to 1.80 V 1.40 to 1.80 V
      Table 7. for Rear Wheel Cylinder (for Type B Front Brake with Solid Type Rear Disc)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Tester Display)

      RL W/C Sensor

      (Tester Display)
      3.61 (36.8, 524) 1.04 to 1.44 V 1.04 to 1.44 V
      4.85 (49.5, 703) 1.29 to 1.69 V 1.29 to 1.69 V
      Table 8. for Rear Wheel Cylinder (for Type B Front Brake with Ventilated Type Rear Disc)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Tester Display)

      RL W/C Sensor

      (Tester Display)
      3.19 (32.6, 463) 0.95 to 1.35 V 0.95 to 1.35 V
      4.85 (49.5, 703) 1.29 to 1.69 V 1.29 to 1.69 V
      Standard Voltage (Calibration ID: Except F1526-53182 and F1526-53192)
      Table 9. for Front Wheel Cylinder (for Type A Front Brake)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Tester Display)

      FL W/C Sensor

      (Tester Display)
      2.83 (28.9, 410) 0.88 to 1.28 V 0.88 to 1.28 V
      3.89 (39.7, 564) 1.09 to 1.49 V 1.09 to 1.49 V
      Table 10. for Front Wheel Cylinder (for Type B Front Brake with Solid Type Rear Disc)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Tester Display)

      FL W/C Sensor

      (Tester Display)
      3.05 (31.1, 442) 0.92 to 1.32 V 0.92 to 1.32 V
      4.82 (49.1, 699) 1.28 to 1.68 V 1.28 to 1.68 V
      Table 11. for Front Wheel Cylinder (for Type B Front Brake with Ventilated Type Rear Disc)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Tester Display)

      FL W/C Sensor

      (Tester Display)
      2.47 (25.2, 358) 0.80 to 1.20 V 0.80 to 1.20 V
      4.82 (49.1, 699) 1.28 to 1.68 V 1.28 to 1.68 V
      Table 12. for Rear Wheel Cylinder (for Type A Front Brake)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Tester Display)

      RL W/C Sensor

      (Tester Display)
      2.78 (28.3, 403) 0.87 to 1.27 V 0.87 to 1.27 V
      3.90 (39.8, 566) 1.10 to 1.50 V 1.10 to 1.50 V
      Table 13. for Rear Wheel Cylinder (for Type B Front Brake with Solid Type Rear Disc)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Tester Display)

      RL W/C Sensor

      (Tester Display)
      2.94 (30.0, 426) 0.90 to 1.30 V 0.90 to 1.30 V
      4.72 (48.1, 685) 1.26 to 1.66 V 1.26 to 1.66 V
      Table 14. for Rear Wheel Cylinder (for Type B Front Brake with Ventilated Type Rear Disc)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Tester Display)

      RL W/C Sensor

      (Tester Display)
      2.44 (24.9, 354) 0.80 to 1.20 V 0.80 to 1.20 V
      4.75 (48.4, 689) 1.27 to 1.67 V 1.27 to 1.67 V
      Result
      Proceed to
      OK
      NG

  5. Click here

    CHECK BRAKE DISC


    1. Turn the power switch off.

    2. Disconnect the A53 brake pedal stroke sensor assembly connector.

    3. Perform a road test according to Freeze Frame Data or customer problem analysis. While driving, check for abnormal brake pedal vibration caused by brake discs that are worn or have excess runout.

      OK
      Brake pedal does not vibrate during braking.
      Tip:

      • An unevenly worn disc may vibrate the caliper piston and cause fluctuations in brake line pressure, triggering a malfunction detection condition.

      • The brake pedal does not kick back due to caliper piston vibration during electronically controlled brake system control.

      • If the brake pedal stroke sensor assembly connector is disconnected, the fail-safe function will prohibit electronically controlled brake system control.

      • The Active Test does not prohibit electronically controlled brake system control when the vehicle is being driven, so disconnect the brake pedal stroke sensor assembly connector before continuing with inspection.

      • Uneven disc wear can be checked by measuring the disc thickness variation.

        for Front Brake:Click here

        for Rear Brake:Click here

      Result
      Proceed to
      OK
      NG

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    RECONFIRM DTC


    1. Reconnect the A53 brake pedal stroke sensor assembly connector.

    2. Clear the DTCs.

      Click here


      1. Chassis > ABS/VSC/TRC > Clear DTCs


    3. Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.

    4. Check if the same DTC is output.

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      1. Chassis > ABS/VSC/TRC > Trouble Codes


      Result
      Result Proceed to
      DTCs C1341/62, C1342/63, C1343/64 and C1344/65 are not output. A
      DTCs C1341/62, C1342/63, C1343/64 and/or C1344/65 are output. B