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

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

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
C1341/62 551

Decrease in front wheel RH hydraulic pressure control performance.

(Pressure increase malfunction)

  • Fluid leak

  • Brake actuator assembly
↑ 552

Decrease in front wheel RH hydraulic pressure control performance.

(Pressure decrease malfunction)

 ↑
↑ 553 There is a malfunction or leak in the FR wheel pressure increase control valve.

  • Fluid leak

  • Disc rotor

  • Brake actuator assembly
↑

554

555

 There is a malfunction or leak in the front wheel RH pressure decrease control valve. ↑
C1342/63 561

Decrease in front wheel LH hydraulic pressure control performance.

(Pressure increase malfunction)

  • Fluid leak

  • Brake actuator assembly
↑ 562

Decrease in front wheel LH hydraulic pressure control performance.

(Pressure decrease malfunction)

 ↑
↑ 563 There is a malfunction or leak in the front wheel LH pressure increase control valve.

  • Fluid leak

  • Disc rotor

  • Brake actuator assembly
↑

564

565

 There is a malfunction or leak in the front wheel LH pressure decrease control valve. ↑
C1343/64 571

Decrease in rear wheel RH hydraulic pressure control performance.

(Pressure increase malfunction)

  • Fluid leak

  • Brake actuator assembly
↑ 572

Decrease in rear wheel RH hydraulic pressure control performance.

(Pressure decrease malfunction)

 ↑
↑ 573 There is a malfunction or leak in the rear wheel RH pressure increase control valve.

  • Fluid leak

  • Disc rotor

  • Brake actuator assembly
↑

574

575

 There is a malfunction or leak in the rear wheel RHl pressure decrease control valve. ↑
C1344/65 581

Decrease in rear wheel LH hydraulic pressure control performance.

(Pressure increase malfunction)

  • Fluid leak

  • Brake actuator assembly
↑ 582

Decrease in rear wheel LH hydraulic pressure control performance.

(Pressure decrease malfunction)

 ↑
↑ 583 There is a malfunction or leak in the rear wheel LH pressure increase control valve.

  • Fluid leak

  • Disc rotor

  • Brake actuator assembly
↑

584

585

 There is a malfunction or leak in the rear wheel LH pressure decrease control valve. ↑

WIRING DIAGRAM

Refer to DTCs C1246/46, C1281/81 and C1364/61 Click here.

INSPECTION PROCEDURE

Note

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

Tech Tips

When C1364/61 is output together with C1341/62, C1342/63, C1343/64 and/or C1344/65, 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 leakage in the brake line between the brake actuator assembly and the wheel cylinder which is indicated by DTCs.

    2. Check that the brake is not dragging.

      OK
      There is no fluid leakage or dragging.

    NG

    REPAIR OR REPLACE APPLICABLE PART

    OK

  2. PERFORM AIR BLEEDING


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


    NEXT

  3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU 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 A14 and A16 skid control ECU assembly connectors and the A12 brake actuator assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A14-28 (E) - Body ground Always 10 kΩ or higher
      A14-27 (VCM) - Body ground Always 10 kΩ or higher
      A14-42 (PRL) - Body ground Always 10 kΩ or higher
      A14-26 (PAC1) - Body ground Always 10 kΩ or higher
      A14-14 (PMC1) - Body ground Always 10 kΩ or higher
      A14-9 (PCK1) - Body ground Always 10 kΩ or higher
      A14-44 (PFR) - Body ground Always 10 kΩ or higher
      A16-44 (E2) - Body ground Always 10 kΩ or higher
      A16-28 (VCM2) - Body ground Always 10 kΩ or higher
      A16-45 (PFL) - Body ground Always 10 kΩ or higher
      A16-43 (PRR) - Body ground Always 10 kΩ or higher
      A16-14 (PMC2) - Body ground Always 10 kΩ or higher
      A16-7 (PCK2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. READ VALUE USING GTS (WHEEL CYLINDER PRESSURE SENSOR)


    1. Reconnect the skid control ECU assembly connectors and the brake actuator assembly connector.

    2. Connect a pedal effort gauge Click here.

    3. Connect the GTS to the DLC3.

    4. Turn the power switch on (IG).

    5. Select the Data List on the GTS Click here.

      ABS/VSC/TRC
      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

      When brake pedal is released:

      0.3 to 0.7 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

      When brake pedal is released:

      0.3 to 0.7 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

      When brake pedal is released:

      0.3 to 0.7 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

      When brake pedal is released:

      0.3 to 0.7 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
      Front Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2GR-FXE)
      except Sport Package

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Data List Display)

      FL W/C Sensor

      (Data List Display)
      3.84 (39.2, 557) 1.08 to 1.48 V 1.08 to 1.48 V
      5.29 (53.9, 767) 1.38 to 1.78 V 1.38 to 1.78 V
      Front Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2GR-FXE)
      for Sport Package

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Data List Display)

      FL W/C Sensor

      (Data List Display)
      3.19 (32.5, 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
      Front Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2AR-FSE)
      Front Disc Brake Pad (Type A) / Rear Disc Brake Pad (Type A)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Data List Display)

      FL W/C Sensor

      (Data List Display)
      3.60 (36.7, 522) 1.04 to 1.44 V 1.04 to 1.44 V
      5.26 (53.6, 763) 1.37 to 1.77 V 1.37 to 1.77 V
      Front Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2AR-FSE)
      Front Disc Brake Pad (Type B) / Rear Disc Brake Pad (Type B)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Data List Display)

      FL W/C Sensor

      (Data List Display)
      2.57 (26.2, 373) 0.83 to 1.23 V 0.83 to 1.23 V
      4.76 (48.5, 690) 1.27 to 1.67 V 1.27 to 1.67 V
      Front Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2AR-FSE)
      Front Disc Brake Pad (Type B) / Rear Disc Brake Pad (Type A)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Data List Display)

      FL W/C Sensor

      (Data List Display)
      2.78 (28.3, 403) 0.87 to 1.27 V 0.87 to 1.27 V
      4.81 (49.0, 697) 1.28 to 1.68 V 1.28 to 1.68 V
      Front Wheel Cylinder Pressure Sensor: for 18 inch Front Disc Brake

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Data List Display)

      FL W/C Sensor

      (Data List Display)
      3.25 (33.1, 471) 0.96 to 1.36 V 0.96 to 1.36 V
      4.85 (49.5, 703) 1.29 to 1.69 V 1.29 to 1.69 V
      Rear Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2GR-FXE)
      except Sport Package

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Data List Display)

      RL W/C Sensor

      (Data List Display)
      3.84 (39.2, 557) 1.08 to 1.48 V 1.08 to 1.48 V
      5.29 (53.9, 767) 1.38 to 1.78 V 1.38 to 1.78 V
      Rear Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2GR-FXE)
      for Sport Package

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Data List Display)

      RL W/C Sensor

      (Data List Display)
      3.19 (32.5, 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
      Rear Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2AR-FSE)
      Front Disc Brake Pad (Type A) / Rear Disc Brake Pad (Type A)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Data List Display)

      RL W/C Sensor

      (Data List Display)
      3.60 (36.7, 522) 1.04 to 1.44 V 1.04 to 1.44 V
      5.26 (53.6, 763) 1.37 to 1.77 V 1.37 to 1.77 V
      Rear Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2AR-FSE)
      Front Disc Brake Pad (Type B) / Rear Disc Brake Pad (Type B)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Data List Display)

      RL W/C Sensor

      (Data List Display)
      2.57 (26.2, 373) 0.83 to 1.23 V 0.83 to 1.23 V
      4.76 (48.5, 690) 1.27 to 1.67 V 1.27 to 1.67 V
      Rear Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2AR-FSE)
      Front Disc Brake Pad (Type B) / Rear Disc Brake Pad (Type A)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Data List Display)

      RL W/C Sensor

      (Data List Display)
      2.78 (28.3, 403) 0.87 to 1.27 V 0.87 to 1.27 V
      4.81 (49.0, 697) 1.28 to 1.68 V 1.28 to 1.68 V
      Rear Wheel Cylinder Pressure Sensor: for 18 inch Front Disc Brake

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Data List Display)

      RL W/C Sensor

      (Data List Display)
      3.25 (33.1, 471) 0.96 to 1.36 V 0.96 to 1.36 V
      4.85 (49.5, 703) 1.29 to 1.69 V 1.29 to 1.69 V

      Tech Tips

      Refer to the on-vehicle inspection for the brake stroke simulator cylinder for details about the pad shapes and which pad combinations to use for the 17 inch front disc brake for vehicles with a 2AR-FSE engine Click here.


    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  5. CHECK BRAKE DISC


    1. Turn the power switch off.

    2. Disconnect the brake pedal stroke sensor assembly connector.

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

      OK
      The brake pedal does not vibrate during braking.

      Tech Tips


      • 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 the vehicle is driving, so disconnect the stroke sensor connector before continuing with inspection.

      • Disc wear can be checked by measuring the disc thickness Click here for 17 inch Front Disc Brake, Click here for 18 inch Front Disc Brake, or Click here for rear).


    NG

    REPLACE BRAKE DISC

    OK

  6. RECONFIRM DTC


    1. Reconnect the brake pedal stroke sensor assembly 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
      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

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here