ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1214/62

DTC Code DTC Name
C1214/62 Hydraulic Control System Malfunction

DESCRIPTION

The skid control ECU controls braking force according to the hybrid control system regenerative braking force and inputs 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 Code INF Code DTC Detection Condition Trouble Area
C1214/62 431

Decrease in hydraulic pressure control performance.

(Pressure increase malfunction)


  • Brake fluid leaks

  • Brake disc rotor excessive wear

  • Brake booster with master cylinder (Brake actuator)

432

Decrease in hydraulic pressure control performance.

(Pressure decrease malfunction)

433 Malfunctions such as leaks occur in the SLA valve.

434

435

Malfunctions such as leaks occur in the SLR valve.

436

437

Decrease in hydraulic pressure control performance.
438 Malfunctions such as leaks occur in a hydraulic circuit valve. Brake booster with master cylinder (Brake actuator)

INSPECTION PROCEDURE

Note

When replacing the brake booster with master cylinder (brake actuator), perform initialization and calibration of the linear solenoid valve Click here.

Tech Tips

When C1364/61 is output together with C1214/62, inspect and repair the trouble areas indicated by C1364/61 first Click here.

PROCEDURE


  1. CHECK FOR FLUID LEAK


    1. Check that there is no fluid leaks in the brake line between the brake actuator and the wheel cylinder.

    2. Check that the brake is not dragging.

      OK
      There is no fluid leaks or dragging.

    NG
    OK
  2. PERFORM AIR BLEEDING


    1. Clear the DTCs Click here.

    2. Perform the air bleeding procedure in Bleed Brake System Click here.


    NEXT
  3. CHECK BRAKE BOOSTER WITH MASTER CYLINDER (ACTUATOR SIDE)


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

    2. Disconnect the skid control ECU connector 2 minutes after the power switch is turned off.

    3. Check both the connector case and the terminal for deformation and corrosion.

      OK
      No deformation or corrosion.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B
    C
    A
  4. CHECK HARNESS AND CONNECTOR (VEHICLE SIDE)


    1. Measure the voltage and resistance on the wire harness side Click here.

      OK
      Voltage and resistance readings are all normal.

    NG
    OK
  5. READ VALUE USING INTELLIGENT TESTER (WHEEL CYLINDER PRESSURE SENSOR)


    1. Reconnect the skid control ECU connector.

    2. Connect an LSPV gauge set.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the power switch on (IG).

    5. Select the Data List on the intelligent tester Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Wheel Cylinder Pressure Sensor Wheel cylinder pressure sensor / Min.: 0 V, Max.: 5 V

      When brake pedal released:

      0.1 to 0.9 V

      Reading increases when brake pedal is depressed
    6. Check the output value of the wheel cylinder pressure sensor at each hydraulic pressure level during the electronically controlled brake system control.

      Standard Voltage
      for Front Wheel Cylinder Pressure Sensor LH

      Hydraulic Pressure

      (MPa (kgf/cm2, psi))

      Wheel Cylinder Pressure Sensor

      (V)

      2.0 (20.4, 290) 0.53 to 1.33
      5.0 (51.0, 725) 1.12 to 1.92
      7.0 (71.4, 1015) 1.52 to 2.32
      10.0 (102.0, 1451) 2.14 to 2.94
      for Front Wheel Cylinder Pressure Sensor RH

      Hydraulic Pressure

      (MPa (kgf/cm2, psi))

      Wheel Cylinder Pressure Sensor

      (V)

      2.0 (20.4, 290) 0.53 to 1.33
      5.0 (51.0, 725) 1.12 to 1.92
      7.0 (71.4, 1015) 1.52 to 2.32
      10.0 (102.0, 1451) 2.14 to 2.94
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B
    C
    A
  6. CHECK BRAKE DISC


    1. Turn the power switch off.

    2. Disconnect the brake pedal stroke sensor connector.

    3. Perform a road test according to Freeze Frame Data or customer problem analysis. Check the brake line pressure vibration caused due to uneven wear of the disc according to brake pedal vibration.

      OK
      Brake pedal does not vibrate during braking.

      Tech Tips


      • 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 wheel cylinder piston vibration during electronically controlled brake system control.

      • If the brake pedal stroke sensor 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 driving the vehicle, so disconnect the stroke sensor connector before continuing with inspection.

      • Disc uneven wear can be checked by measuring the disc thickness variation Click here for front, or Click here for rear).


    NG
    OK
  7. RECONFIRM DTC


    1. Reconnect the brake pedal stroke sensor connector.

    2. Clear the DTCs Click here.

    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 recorded Click here.

      Result
      Result Proceed to
      DTC (C1214/62) is not output A
      DTC (C1214/62) is output (for LHD) B
      DTC (C1214/62) is output (for RHD) C

      Tech Tips

      If the DTC is no longer output, it can be suspected that it was output due to an improperly connected connector.


    B
    C
    A