DTC    C1341/62    Front Hydraulic System RH Malfunction

DTC    C1342/63    Front Hydraulic System LH Malfunction

DTC    C1343/64    Rear Hydraulic System RH Malfunction

DTC    C1344/65    Rear Hydraulic System LH Malfunction

for Preparation Click here


DESCRIPTION

The skid control ECU inputs the operating fluid pressure of each wheel cylinder using the wheel cylinder pressure sensors in order to control the braking force of each wheel.
DTCs may be stored if brake fluid leaks, wheel cylinder vibrates due to uneven wear of the brake disc rotor, of foreign matter enters the solenoid valve.
DTCs may be stored if the line pressure drops during air bleeding.

DTC No.
INF Code
DTC Detection Condition
Trouble Area
C1341/62
551
552
Hydraulic pressure control on FR wheel has deteriorated.
  1. Fluid leakage
  2. Brake actuator assembly
↑
553
There is a malfunction, such as leakage in the pressure increase control valve of FR wheel.
  1. Fluid leakage
  2. Disc rotor
  3. Brake actuator assembly
↑
554
555
There is a malfunction, such as leakage in the pressure decrease control valve of FR wheel.
↑
C1342/63
561
562
Hydraulic pressure control on FL wheel has deteriorated.
  1. Fluid leakage
  2. Brake actuator assembly
↑
563
There is a malfunction, such as leakage in pressure increase control valve of FL wheel.
  1. Fluid leakage
  2. Disc rotor
  3. Brake actuator assembly
↑
564
565
There is a malfunction, such as leakage in pressure decrease control valve of FL wheel.
↑
C1343/64
571
572
Hydraulic pressure control on RR wheel has deteriorated.
  1. Fluid leakage
  2. Brake actuator assembly
↑
573
There is a malfunction, such as leakage in pressure increase control valve of RR wheel.
  1. Fluid leakage
  2. Disc rotor
  3. Brake actuator assembly
↑
574
575
There is a malfunction, such as leakage in pressure decrease control valve of RR wheel.
↑
C1344/65
581
582
Hydraulic pressure control on RL wheel has deteriorated.
  1. Fluid leakage
  2. Brake actuator assembly
↑
583
There is a malfunction, such as leakage in pressure increase control valve of RL wheel.
  1. Fluid leakage
  2. Disc rotor
  3. Brake actuator assembly
↑
584
585
There is a malfunction, such as leakage in pressure decrease control valve of RL wheel.
↑

WIRING DIAGRAM

Refer to DTCs C1315/31, C1316/32, C1352/21, C1353/23, C1354/25, C1355/27, C1356/22, C1357/24, C1358/26 and C1359/28 (Click here).

INSPECTION PROCEDURE

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

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

1.CHECK BRAKE FLUID LEAKAGE

  1. Check that there is no fluid leakage in the brake line between the brake actuator and the wheel cylinder which is the cause of DTCs.

  1. 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 BLEED

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


NEXT


3.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO BODY GROUND)


    C110724E09

  1. Disconnect the skid control ECU (A13, A15) connectors.

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

    Resistance:
    Tester Connection
    		Specified Condition
    A13-3 (FRA+) - Body ground
    		10 kΩ or higher
    A13-18 (FRA-) - Body ground
    		10 kΩ or higher
    A13-4 (FRR+) - Body ground
    		10 kΩ or higher
    A13-17 (FRR-) - Body ground
    		10 kΩ or higher
    A13-33 (RLA+) - Body ground
    		10 kΩ or higher
    A13-35 (RLA-) - Body ground
    		10 kΩ or higher
    A13-34 (RLR+) - Body ground
    		10 kΩ or higher
    A13-19 (RLR-) - Body ground
    		10 kΩ or higher
    A15-3 (FLA+) - Body ground
    		10 kΩ or higher
    A15-16 (FLA-) - Body ground
    		10 kΩ or higher
    A15-4 (FLR+) - Body ground
    		10 kΩ or higher
    A15-15 (FLR-) - Body ground
    		10 kΩ or higher
    A15-29 (RRA+) - Body ground
    		10 kΩ or higher
    A15-17 (RRA-) - Body ground
    		10 kΩ or higher
    A15-30 (RRR+) - Body ground
    		10 kΩ or higher
    A15-31 (RRR-) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.READ VALUE OF INTELLIGENT TESTER (WHEEL CYLINDER PRESSURE SENSOR)

  1. Connect the pedal effort gauge.

  1. Install the LSPV gauge (SST) and perform bleeding (Click here).

SST
09709-29018  

  1. Connect the intelligent tester to the DLC3.

  1. Select the DATA LIST mode on the intelligent tester.

    ABS / VSC / TR(A)C: 
    Item (Display)
    		Measurement Item /
    Range (Display)
    		Normal Condition
    FR W/C Sensor
    		FR wheel cylinder pressure sensor / min.: 0 V, max.: 5 V
    		When brake pedal is released:
    0.3 to 0.9 V
    FL W/C Sensor
    		FL wheel cylinder pressure sensor / min.: 0 V, max.: 5 V
    		When brake pedal is released:
    0.3 to 0.9 V
    RR W/C Sensor
    		RR wheel cylinder pressure sensor / min.: 0 V, max.: 5 V
    		When brake pedal is released:
    0.3 to 0.9 V
    RL W/C Sensor
    		RL wheel cylinder pressure sensor / min.: 0 V, max.: 5 V
    		When brake pedal is released:
    0.3 to 0.9 V

  1. Check the output value of the wheel cylinder pressure at each fluid pressure during the ECB control.

    Voltage:
    Front Wheel Cylinder Pressure Sensor:

    Fluid Pressure
    MPa (kgf/cm2, psi)
    		FR W/C Sensor
    (DATA LIST)
    		FL W/C Sensor
    (DATA LIST)
    3.2 (32.6, 464)
    		1.0 to 1.3 V
    		1.0 to 1.3 V
    7.0 (71.4, 1016)
    		1.75 to 2.05 V
    		1.75 to 2.05 V
    8.3 (84.6, 1203)
    		2.05 to 2.35 V
    		2.05 to 2.35 V
    Rear Wheel Cylinder Pressure Sensor:

    Fluid Pressure
    MPa (kgf/cm2, psi)
    		RR W/C Sensor
    (DATA LIST)
    		RL W/C Sensor
    (DATA LIST)
    3.1 (31.6, 449)
    		1.0 to 1.3 V
    		1.0 to 1.3 V
    4.0 (40.8, 580)
    		1.15 to 1.45 V
    		1.15 to 1.45 V



NG
REPLACE BRAKE ACTUATOR ASSEMBLY
OK


5.CHECK BRAKE DISC

  1. Disconnect the brake pedal stroke sensor connector.

  1. Carry out the running and braking 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.

    HINT:
    1. The brake pedal does not kick back due to wheel cylinder piston vibration during ECB control.
    2. If the brake pedal stroke sensor connector is disconnected, the fail-safe function will prohibit ECB control.
    3. The active test does not prohibit ECB control when the vehicle is running, so disconnect the stroke sensor connector and carry out inspection.
    4. Disc wear can be checked by measuring the disc thickness.



NG
REPLACE BRAKE DISC
OK


6.RECONFIRM DTC

  1. Clear the DTCs (Click here).

  1. Repeat the braking test under malfunction conditions recreated based on the FREEZE FRAME DATA or customer problem analysis.

  1. Check if the same DTCs are recorded (Click here).

    HINT:
    Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.


    Result:

    Condition
    		Proceed To
    DTCs (C1341/62, C1342/63, C1343/64 and C1344/65) are not output
    		A
    DTCs (C1341/62, C1342/63, C1343/64 and C1344/65) are output
    		B



B
REPLACE BRAKE ACTUATOR ASSEMBLY
A

END