ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1214

DTC Code DTC Name
C1214 Hydraulic Control System Malfunction

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) controls braking force according to the hybrid control system regenerative braking force and provides the hydraulic pressure necessary for operating the master cylinder and each wheel cylinder according to the servo pressure sensor.

DTCs may be stored if one of the following occurs:


DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1214 Hydraulic Control System Malfunction

431

432

436

438

440

441

442


  • INF Code: 431


    • Fluid pressure control performance degraded (high pressure).

  • INF Code: 432


    • Fluid pressure control performance degraded (low pressure).

  • INF Code: 436


    • SLA valve malfunction (stuck, etc.).

  • INF Code: 438


    • Malfunction in one of the two circuits (leakage, etc.).

  • INF Code: 440


    • SSA valve malfunction (stuck, etc.).

  • INF Code: 441


    • SGH valve malfunction (stuck, etc.).

  • INF Code: 442


    • Malfunction (leakage, etc.) detected in the ABS decrease pressure valve in the brake actuator assembly.


  • INF Code: 431, 432, 436, 438, 440, 441


    • Brake fluid leaks

    • Uneven brake disc rotor wear

    • Brake actuator (brake booster with master cylinder assembly)

  • INF Code: 442


    • Brake actuator assembly

Electronically controlled brake system DTC

WIRING DIAGRAM

Refer to DTCs C1352, C1353, C1354, C1355, C1356, C1357, C1358 and C1359

Click here

CAUTION / NOTICE / HINT

Note

After replacing the brake booster with master cylinder assembly or brake actuator assembly, perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".

Click here

PROCEDURE


  1. CUSTOMER PROBLEM ANALYSIS (CHECK CONDITION WHEN MALFUNCTION OCCURRED) AND FREEZE FRAME DATA


    1. Interview the customer to check the vehicle conditions when the brake warning light / yellow (minor malfunction) illuminated.

    2. Using the GTS, read the "Shift Lever Position", "Vehicle Speed", "Yaw Rate Sensor", "Steering Angle Sensor", "Reaction Force Pressure", "Servo Pressure" and "Accumulator Pressure" of the Freeze Frame Data stored when the DTC was stored.

      Also, read the Freeze Frame Data stored when the DTC was stored and make a note of the INF codes.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes

      Note

      Make sure to make a note of the INF codes as they are used in a following step.

      Tech Tips


      • Freeze Frame Data is only stored once when a DTC is stored.

      • If other DTCs are output, repair any malfunctions related to those DTCs first, and then reproduce the conditions that caused DTC C1214 to be stored based on the interview with the customer.

      Result
      Proceed to
      NEXT

    NEXT
  2. CHECK FOR FLUID LEAK


    1. Check that there are no fluid leaks in the brake lines between the brake booster with master cylinder assembly and the wheel cylinders.

    2. Check that there is no brake fluid leaks from the brake booster with master cylinder assembly or brake actuator assembly body.

    3. Check that the brakes are not dragging.

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

    NG
    OK
  3. PERFORM AIR BLEEDING


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs
    2. Perform the air bleeding procedure in Bleed Brake System.

      Click here

      Result
      Proceed to
      NEXT

    NEXT
  4. CHECK BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY AND BRAKE ACTUATOR ASSEMBLY (ACTUATOR SIDE)


    1. Turn the power switch off.

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

      OK
      The connector is securely connected.
    3. Disconnect the A32 skid control ECU (brake booster with master cylinder assembly) connector 2 minutes after the power switch is turned off.

    4. Disconnect the A33 brake actuator assembly connector (for LHD).

    5. Disconnect the A34 brake actuator assembly connector (for RHD).

    6. Check both the connector case and the terminals for deformation and corrosion.

      OK
      No deformation or corrosion.
      Result
      Result Proceed to
      OK A
      NG (skid control ECU (brake booster with master cylinder assembly)) B
      NG (brake actuator assembly) C

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


    1. Reconnect the A32 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Reconnect the A33 brake actuator assembly connector (for LHD).

    3. Reconnect the A34 brake actuator assembly connector (for RHD).

    4. Measure the voltage and resistance on the wire harness side.

      Click here

      OK
      Voltage and resistance readings are all normal.
      Result
      Proceed to
      OK
      NG

    NG
    OK
  6. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)


    1. Turn the power switch off.

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

      OK
      The connector is securely connected.
    3. Disconnect the A32 skid control ECU (brake booster with master cylinder assembly) connector.

    4. Disconnect the A33 brake actuator assembly connector (for LHD).

    5. Disconnect the A34 brake actuator assembly connector (for RHD).

    6. Check both the connector case and the terminals for deformation and corrosion.

      OK
      No deformation or corrosion.
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A32-14 (+BS) - A33-38 (+BS) Always Below 1 Ω
      A32-14 (+BS) or A33-38 (+BS) - Body ground Always 10 kΩ or higher
      A32-48 (SFRH) - A33-8 (SFRH) Always Below 1 Ω
      A32-48 (SFRH) or A33-8 (SFRH) - Body ground Always 10 kΩ or higher
      A32-49 (SFLH) - A33-37 (SFLH) Always Below 1 Ω
      A32-49 (SFLH) or A33-37 (SFLH) - Body ground Always 10 kΩ or higher
      A32-50 (SRRH) - A33-11 (SRRH) Always Below 1 Ω
      A32-50 (SRRH) or A33-11 (SRRH) - Body ground Always 10 kΩ or higher
      A32-51 (SRLH) - A33-34 (SRLH) Always Below 1 Ω
      A32-51 (SRLH) or A33-34 (SRLH) - Body ground Always 10 kΩ or higher
      A32-44 (SFRR) - A33-2 (SFRR) Always Below 1 Ω
      A32-44 (SFRR) or A33-2 (SFRR) - Body ground Always 10 kΩ or higher
      A32-45 (SFLR) - A33-31 (SFLR) Always Below 1 Ω
      A32-45 (SFLR) or A33-31 (SFLR) - Body ground Always 10 kΩ or higher
      A32-46 (SRRR) - A33-5 (SRRR) Always Below 1 Ω
      A32-46 (SRRR) or A33-5 (SRRR) - Body ground Always 10 kΩ or higher
      A32-47 (SRLR) - A33-28 (SRLR) Always Below 1 Ω
      A32-47 (SRLR) or A33-28 (SRLR) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A32-14 (+BS) - A34-38 (+BS) Always Below 1 Ω
      A32-14 (+BS) or A34-38 (+BS) - Body ground Always 10 kΩ or higher
      A32-48 (SFRH) - A34-37 (SFRH) Always Below 1 Ω
      A32-48 (SFRH) or A34-37 (SFRH) - Body ground Always 10 kΩ or higher
      A32-49 (SFLH) - A34-8 (SFLH) Always Below 1 Ω
      A32-49 (SFLH) or A34-8 (SFLH) - Body ground Always 10 kΩ or higher
      A32-50 (SRRH) - A34-34 (SRRH) Always Below 1 Ω
      A32-50 (SRRH) or A34-34 (SRRH) - Body ground Always 10 kΩ or higher
      A32-51 (SRLH) - A34-11 (SRLH) Always Below 1 Ω
      A32-51 (SRLH) or A34-11 (SRLH) - Body ground Always 10 kΩ or higher
      A32-44 (SFRR) - A34-31 (SFRR) Always Below 1 Ω
      A32-44 (SFRR) or A34-31 (SFRR) - Body ground Always 10 kΩ or higher
      A32-45 (SFLR) - A34-2 (SFLR) Always Below 1 Ω
      A32-45 (SFLR) or A34-2 (SFLR) - Body ground Always 10 kΩ or higher
      A32-46 (SRRR) - A34-28 (SRRR) Always Below 1 Ω
      A32-46 (SRRR) or A34-28 (SRRR) - Body ground Always 10 kΩ or higher
      A32-47 (SRLR) - A34-5 (SRLR) Always Below 1 Ω
      A32-47 (SRLR) or A34-5 (SRLR) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  7. CHECK INFORMATION CODE


    1. Reconnect the A32 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Reconnect the A33 brake actuator assembly connector (for LHD).

    3. Reconnect the A34 brake actuator assembly connector (for RHD).

    4. Reconfirm the INF codes noted in step 1.

      Result
      Result Proceed to
      INF codes 431, 432 and/or 436 were output in step 1. A
      INF code 438 was output in step 1. B
      INF codes 440 and/or 441 were output in step 1. C
      INF code 442 was output in step 1. D

    B
    C
    D
    A
  8. READ VALUE USING GTS (SERVO PRESSURE)


    1. Connect an LSPV gauge set.

    2. Select the Data List on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Servo Pressure Pressure value of servo Min.: 0.00 MPa, Max.: 24.48 MPa Brake pedal released: 0.00 to 2.10 MPa Brake pedal is being depressed: Changes in proportion to the depression force of the brake pedal

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Servo Pressure
    3. Depress the brake pedal slowly and check the servo pressure output values with respect to the wheel cylinder pressure values for each wheel.

      Standard Pressure
      Servo Pressure (for Front Right Wheel)

      Hydraulic Pressure

      [MPa (kgf/cm2, psi)]

      Servo Pressure

      [MPa]

      2.0 (20.4, 290) 0.3 to 4.3
      5.0 (51.0, 725) 3.3 to 7.3
      7.0 (71.4, 1015) 5.3 to 9.3
      Servo Pressure (for Front Left Wheel)

      Hydraulic Pressure

      [MPa (kgf/cm2, psi)]

      Servo Pressure

      [MPa]

      2.0 (20.4, 290) 0.3 to 4.3
      5.0 (51.0, 725) 3.3 to 7.3
      7.0 (71.4, 1015) 5.3 to 9.3
      Result
      Proceed to
      OK
      NG

    NG
    OK
  9. CHECK BRAKE DISC


    1. Turn the power switch off.

    2. Disconnect the A36 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.

      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 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

    NG
    OK
  10. RECONFIRM DTC


    1. Turn the power switch off.

    2. Reconnect the A36 brake pedal stroke sensor assembly connector.

    3. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs
    4. Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.

    5. Turn the power switch off and wait for 2 minutes or more.

    6. Turn the power switch on (IG).

    7. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1214 is not output. A
      DTC C1214 is output. B

      Tech Tips

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

      Click here


    A
    B
  11. READ VALUE USING GTS (SERVO PRESSURE)


    1. Connect an LSPV gauge set.

    2. Select the Data List on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Servo Pressure Pressure value of servo Min.: 0.00 MPa, Max.: 24.48 MPa Brake pedal released: 0.00 to 2.10 MPa Brake pedal is being depressed: Changes in proportion to the depression force of the brake pedal

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Servo Pressure
    3. Depress the brake pedal slowly and check the servo pressure output values with respect to the wheel cylinder pressure values for each wheel.

      Standard Pressure
      Servo Pressure (for Front Right Wheel)

      Hydraulic Pressure

      [MPa (kgf/cm2, psi)]

      Servo Pressure

      [MPa]

      2.0 (20.4, 290) 0.3 to 4.3
      5.0 (51.0, 725) 3.3 to 7.3
      7.0 (71.4, 1015) 5.3 to 9.3
      Servo Pressure (for Front Left Wheel)

      Hydraulic Pressure

      [MPa (kgf/cm2, psi)]

      Servo Pressure

      [MPa]

      2.0 (20.4, 290) 0.3 to 4.3
      5.0 (51.0, 725) 3.3 to 7.3
      7.0 (71.4, 1015) 5.3 to 9.3
      Result
      Proceed to
      OK
      NG

    NG
    OK
  12. CHECK BRAKE DISC


    1. Turn the power switch off.

    2. Disconnect the A36 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.

      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 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

    NG
    OK
  13. READ VALUE USING GTS (BRAKE PEDAL STROKE SENSOR ASSEMBLY)


    1. Turn the power switch off.

    2. Reconnect the A36 brake pedal stroke sensor assembly connector.

    3. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs
    4. Turn the power switch off.

    5. Mount a pedal effort gauge.

    6. Turn the power switch on (READY) and depress the brake pedal once.

      Tech Tips

      Depress the brake pedal after turning the power switch on (READY) to set the vehicle to linear mode (switching solenoid (SSA) on).

    7. Select the Data List on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stroke Sensor Brake pedal stroke sensor assembly Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.65 to 1.35 V Reading increases when brake pedal is depressed
      Stroke Sensor2 Brake pedal stroke sensor assembly 2 Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 3.65 to 4.35 V Reading decreases when brake pedal is depressed

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Stroke Sensor
      Stroke Sensor2
    8. Depress the brake pedal slowly and check the brake pedal stroke sensor assembly output voltages with respect to brake pedal depression force.

      Note

      Perform this procedure in linear mode (switching solenoid (SSA) on).

      Standard Voltage

      Brake Effort

      [N (kgf, lbf)]

      Stroke Sensor

      [V]

      Stroke Sensor2

      [V]

      50 (5, 11.2) 1.05 to 1.75 3.25 to 3.95
      100 (10, 22.5) 1.18 to 1.88 3.12 to 3.82
      150 (15, 33.7) 1.28 to 1.98 3.02 to 3.72
      200 (20, 45.0) 1.34 to 2.04 2.96 to 3.66
      Result
      Proceed to
      OK
      NG

    NG
    OK
  14. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs
    2. Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.

    3. Turn the power switch off and wait for 2 minutes or more.

    4. Turn the power switch on (IG).

    5. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1214 is not output. A
      DTC C1214 is output. B

      Tech Tips

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

      Click here


    A
    B
  15. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs
    2. Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.

    3. Turn the power switch off and wait for 2 minutes or more.

    4. Turn the power switch on (IG).

    5. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1214 is not output. A
      DTC C1214 is output. B

      Tech Tips

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

      Click here


    A
    B
  16. INSPECT BRAKE PEDAL STROKE SENSOR ASSEMBLY OUTPUT VOLTAGES AND WHEEL CYLINDER PRESSURE


    1. Mount a pedal effort gauge.

    2. Disconnect the A11 brake booster pump assembly connector.

    3. Depress the brake pedal 10 times or more until it becomes hard.

      Tech Tips

      Depressing the brake pedal with the connector of the brake booster pump assembly disconnected drops the accumulator pressure to approximately 0 MPa.

    4. Connect an LSPV gauge set.

    5. Select the Data List on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stroke Sensor Brake pedal stroke sensor assembly Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.65 to 1.35 V Reading increases when brake pedal is depressed

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Stroke Sensor
    6. Slowly depress the brake pedal and check the brake pedal stroke sensor assembly output voltages and the wheel cylinder pressure with respect to brake pedal depression force.

      Note

      Check the wheel cylinder pressure with the switching solenoid (SSA, SGH) off and an accumulator pressure of 0 MPa.

      Standard Pressure
      for Front Right Wheel

      Brake Effort

      [N (kgf, lbf)]

      Stroke Sensor

      [V]

      Hydraulic Pressure

      [MPa (kgf/cm2, psi)]

      200 (20, 45.0) 1.14 to 1.84 0.03 (0.3, 4.4) to 2.03 (20.7, 294)
      500 (51, 112.4) 1.31 to 2.01 2.00 (20.4, 290) to 4.00 (40.8, 580)
      for Front Left Wheel

      Brake Effort

      [N (kgf, lbf)]

      Stroke Sensor

      [V]

      Hydraulic Pressure

      [MPa (kgf/cm2, psi)]

      200 (20, 45.0) 1.14 to 1.84 0.03 (0.3, 4.4) to 2.03 (20.7, 294)
      500 (51, 112.4) 1.31 to 2.01 2.00 (20.4, 290) to 4.00 (40.8, 580)
      Result
      Proceed to
      OK
      NG

    NG
    OK
  17. RECONFIRM DTC


    1. Turn the power switch off.

    2. Reconnect the A11 brake booster pump assembly connector.

    3. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs
    4. Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.

    5. Turn the power switch off and wait for 2 minutes or more.

    6. Turn the power switch on (IG).

    7. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1214 is not output. A
      DTC C1214 is output. B

      Tech Tips

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

      Click here


    A
    B