RX400h · Service Manual BRAKE

C1341/62

Diagnostic trouble codes

DESCRIPTION

The skid control ECU controls braking force according to the hybrid system regenerative braking force and inputs the fluid pressure necessary for operating each wheel cylinder according to the wheel cylinder pressure sensor.
DTCs may be stored if brake fluid leaks, wheel cylinder vibrates due to uneven wear of the brake disc rotor, or foreign matter enters the solenoid valve.
DTCs may be stored if the line pressure drops during air bleeding.
DTC No.
 INF Code
 DTC Detecting Condition
 Trouble Area
C1341/62
 551
 Hydraulic pressure control on FR wheel has deteriorated.
  1. Fluid leakage
  2. Brake actuator assembly
C1341/62
 552
 Hydraulic pressure control on FR wheel has deteriorated.
  1. Fluid leakage
  2. Brake actuator assembly
C1341/62
 553
 There is a malfunction, such as leakage in the pressure increase control valve of FR wheel.
  1. Fluid leakage
  2. Brake actuator assembly
  3. Disc rotor
C1341/62
 554
 There is a malfunction, such as leakage in the pressure decrease control valve of FR wheel.
  1. Fluid leakage
  2. Brake actuator assembly
  3. Disc rotor
C1341/62
 555
 There is a malfunction, such as leakage in the pressure decrease control valve of FR wheel.
  1. Fluid leakage
  2. Brake actuator assembly
  3. Disc rotor
C1342/63
 561
 Hydraulic pressure control on FL wheel has deteriorated.
  1. Fluid leakage
  2. Brake actuator assembly
C1342/63
 562
 Hydraulic pressure control on FL wheel has deteriorated.
  1. Fluid leakage
  2. Brake actuator assembly
C1342/63
 563
 There is a malfunction, such as leakage in pressure increase control valve of FL wheel.
  1. Fluid leakage
  2. Brake actuator assembly
  3. Disc rotor
C1342/63
 564
 There is a malfunction, such as leakage in pressure decrease control valve of FL wheel.
  1. Fluid leakage
  2. Brake actuator assembly
  3. Disc rotor
C1342/63
 565
 There is a malfunction, such as leakage in pressure decrease control valve of FL wheel.
  1. Fluid leakage
  2. Brake actuator assembly
  3. Disc rotor
C1343/64
 571
 Hydraulic pressure control on RR wheel has deteriorated.
  1. Fluid leakage
  2. Brake actuator assembly
C1343/64
 572
 Hydraulic pressure control on RR wheel has deteriorated.
  1. Fluid leakage
  2. Brake actuator assembly
C1343/64
 573
 There is a malfunction, such as leakage in pressure increase control valve of RR wheel.
  1. Fluid leakage
  2. Brake actuator assembly
  3. Disc rotor
C1343/64
 574
 There is a malfunction, such as leakage in pressure decrease control valve of RR wheel.
  1. Fluid leakage
  2. Brake actuator assembly
  3. Disc rotor
C1343/64
 575
 There is a malfunction, such as leakage in pressure decrease control valve of RR wheel.
  1. Fluid leakage
  2. Brake actuator assembly
  3. Disc rotor
C1344/65
 581
 Hydraulic pressure control on RL wheel has deteriorated.
  1. Fluid leakage
  2. Brake actuator assembly
C1344/65
 582
 Hydraulic pressure control on RL wheel has deteriorated.
  1. Fluid leakage
  2. Brake actuator assembly
C1344/65
 583
 There is a malfunction, such as leakage in pressure increase control valve of RR wheel.
  1. Fluid leakage
  2. Brake actuator assembly
  3. Disc rotor
C1344/65
 584
 There is a malfunction, such as leakage in pressure decrease control valve of RR wheel.
  1. Fluid leakage
  2. Brake actuator assembly
  3. Disc rotor
C1344/65
 585
 There is a malfunction, such as leakage in pressure decrease control valve of RL wheel.
  1. Fluid leakage
  2. Brake actuator assembly
  3. Disc rotor

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 skid control ECU, perform initialization of linear solenoid valve and calibration (Click here).

HINT:
When C1364/61 is output together with C1341/62, C1342/63, C1343/64 or 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 out of the front and rear systems (Click here).


NEXT


3. RECONFIRM DTC

  1. Clear the DTCs (Click here).

  1. Turn the ignition switch on.

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

    Result:
    Condition
    		 Proceed To
    DTC is output
    		 A
    DTC is not output
    		 B

    HINT:
    DTC may be stored if foreign matter or air enters the solenoid valve.



 B
END
A


4. CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND BRAKE ACTUATOR ASSEMBLY)

  1. Disconnect the skid control ECU connectors and brake actuator connector.F047499E03

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

    Resistance:
    Tester Connection
    		 Tester Connection
    S41-6 (FRA-) - B18-43 (SLAFR-)
    		 Below 1 Ω
    S41-7 (FRA+) - B18-44 (SLAFR+)
    		 Below 1 Ω
    S41-26 (RLR-) - B18-26 (SLRRL-)
    		 Below 1 Ω
    S41-16 (RLR+) - B18-25 (SLRRL+)
    		 Below 1 Ω
    S41-27 (RLA-) - B18-42 (SLARL-)
    		 Below 1 Ω
    S41-15 (RLA+) - B18-41 (SLARL+)
    		 Below 1 Ω
    S38-18 (RRR-) - B18-24 (SLRRR-)
    		 Below 1 Ω
    S38-20 (RRR+) - B18-23 (SLRRR+)
    		 Below 1 Ω
    S38-9 (RRA-) - B18-40 (SLARR-)
    		 Below 1 Ω
    S38-19 (RRA+) - B18-39 (SLARR+)
    		 Below 1 Ω
    S38-26 (FLR-) - B18-22 (SLRFL-)
    		 Below 1 Ω
    S38-8 (FLR+) - B18-21 (SLRFL+)
    		 Below 1 Ω
    S38-2 (FLA-) - B18-38 (SLAFL-)
    		 Below 1 Ω
    S38-1 (FLA+) - B18-35 (SLAFL+)
    		 Below 1 Ω
    S41-34 (FRR-) - B18-27 (SLRFR-)
    		 Below 1 Ω
    S41-17 (FRR+) - B18-28 (SLRFR+)
    		 Below 1 Ω

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

    Resistance:
    Tester Connection
    		 Tester Connection
    S41-6 (FRA-) - Body ground
    		 10 kΩ or higher
    S41-7 (FRA+) - Body ground
    		 10 kΩ or higher
    S41-15 (RLA+) - Body ground
    		 10 kΩ or higher
    S41-16 (RLR+) - Body ground
    		 10 kΩ or higher
    S41-17 (FRR+) - Body ground
    		 10 kΩ or higher
    S41-26 (RLR-) - Body ground
    		 10 kΩ or higher
    S41-27 (RLA-) - Body ground
    		 10 kΩ or higher
    S41-34 (FRR-) - Body ground
    		 10 kΩ or higher
    S38-1 (FLA+) - Body ground
    		 10 kΩ or higher
    S38-2 (FLA-) - Body ground
    		 10 kΩ or higher
    S38-8 (FLR+) - Body ground
    		 10 kΩ or higher
    S38-9 (RRA-) - Body ground
    		 10 kΩ or higher
    S38-18 (RRR-) - Body ground
    		 10 kΩ or higher
    S38-19 (RRA+) - Body ground
    		 10 kΩ or higher
    S38-20 (RRR+) - Body ground
    		 10 kΩ or higher
    S38-26 (FLR-) - Body ground
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Connect the pedal effort gauge.

  1. Install the LSPV gauge (SST) and bleed air (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 / TRAC: 
    Item
    		 Measurement Item /
    Range (Display)
    		 Normal Condition
    FR W/C Sensor
    		 Front right 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
    		 Front left 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
    		 Rear right 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
    		 Rear left 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 PRESS SENS
(DATA-LIST)
 FL PRESS SENS
(DATA-LIST)
2.6 (26.5, 376.9)
 0.85 to 1.15 V
 0.85 to 1.15 V
6.3 (64.3, 914.5)
 1.6 to 1.9 V
 1.6 to 1.9 V
8.1 (82.6, 1174.8)
 1.95 to 2.25 V
 1.95 to 2.25 V
8.2 (83.6, 1189.0)
 2.0 to 2.3 V
 2.0 to 2.3 V
Rear wheel cylinder pressure sensor 
Fluid Pressure
MPa (kgf/cm2, psi)
 RR PRESS SENS
(DATA-LIST)
 RL PRESS SENS
(DATA-LIST)
2.7 (27.5, 391.1)
 0.85 to 1.15 V
 0.85 to 1.15 V
5.0 (51.0, 725.4)
 1.35 to 1.65 V
 1.35 to 1.65 V



NG
REPLACE BRAKE ACTUATOR ASSEMBLY
OK


6. 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 prohibits 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

REPLACE BRAKE ACTUATOR ASSEMBLY


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