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

To control the braking force for each wheel, the skid control ECU assembly inputs the operating fluid pressure of each wheel cylinder from the wheel cylinder pressure sensors.

DTCs may be stored if one of the following occurs:

Brake fluid leaks.
Wheel cylinder vibrates due to uneven wear of a brake disc.
Foreign matter enters solenoid valve.
Line pressure drops during air bleeding.
Brake pads are replaced.
Rotors are replaced.

Tech Tips

When replacing the brake pads, retracting the brake caliper pistons and installing new brake pads will greatly increase the clearance between the brake pads and brake discs. This will result in a significant possibility of this DTC being stored the next time the brake pedal is depressed. As this is not a malfunction, clear the DTC if it is stored for this reason.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	Note
C1341/62	Front Hydraulic System RH Malfunction	551 552 553 554 555	INF Code: 551 Decrease in FR wheel hydraulic pressure control performance. (Pressure increase malfunction) INF Code: 552 Decrease in FR wheel hydraulic pressure control performance. (Pressure decrease malfunction) INF Code: 553 Malfunctions such as leaks occur in the FR wheel pressure increase control valve. INF Code: 554, 555 Malfunctions such as leaks occur in the FR wheel pressure decrease control valve.	INF Code: 551, 552 Brake fluid leaks Brake actuator assembly INF Code: 553, 554, 555 Brake fluid leaks Brake disc rotor excessive wear Brake actuator assembly	Electronically controlled brake system DTC
C1342/63	Front Hydraulic System LH Malfunction	561 562 563 564 565	INF Code: 561 Decrease in FL wheel hydraulic pressure control performance. (Pressure increase malfunction) INF Code: 562 Decrease in FL wheel hydraulic pressure control performance. (Pressure decrease malfunction) INF Code: 563 Malfunctions such as leaks occur in the FL wheel pressure increase control valve. INF Code: 564, 565 Malfunctions such as leaks occur in the FL wheel pressure decrease control valve.	INF Code: 561, 562 Brake fluid leaks Brake actuator assembly INF Code: 563, 564, 565 Brake fluid leaks Brake disc rotor excessive wear Brake actuator assembly	Electronically controlled brake system DTC
C1343/64	Rear Hydraulic System RH Malfunction	571 572 573 574 575	INF Code: 571 Decrease in RR wheel hydraulic pressure control performance. (Pressure increase malfunction) INF Code: 572 Decrease in RR wheel hydraulic pressure control performance. (Pressure decrease malfunction) INF Code: 573 Malfunctions such as leaks occur in the RR wheel pressure increase control valve. INF Code: 574, 575 Malfunctions such as leaks occur in the RR wheel pressure decrease control valve.	INF Code: 571, 572 Brake fluid leaks Brake actuator assembly INF Code: 573, 574, 575 Brake fluid leaks Brake disc rotor excessive wear Brake actuator assembly	Electronically controlled brake system DTC
C1344/65	Rear Hydraulic System LH Malfunction	581 582 583 584 585	INF Code: 581 Decrease in RL wheel hydraulic pressure control performance. (Pressure increase malfunction) INF Code: 582 Decrease in RL wheel hydraulic pressure control performance. (Pressure decrease malfunction) INF Code: 583 There is a malfunction or leak in the RL wheel pressure increase control valve. INF Code: 584, 585 There is a malfunction or leak in the RL wheel pressure decrease control valve.	INF Code: 581, 582 Brake fluid leaks Brake actuator assembly INF Code: 583, 584, 585 Brake fluid leaks Brake disc rotor excessive wear Brake actuator assembly	Electronically controlled brake system DTC

DTC No.	Brake warning light / yellow (minor malfunction) code	ABS warning light code	Slip indicator light code	Brake hold standby indicator light code
C1341	62	42	45	21
C1342	63	42	45	21
C1343	64	42	45	21
C1344	65	42	45	21

WIRING DIAGRAM

Refer to DTCs C1246/46 and C1364/61.

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CAUTION / NOTICE / HINT

Note

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

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Tech Tips

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

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PROCEDURE

CHECK DTC

Check if the same DTC is output.

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Chassis > ABS/VSC/TRC > Trouble Codes

Result

Result	Proceed to
DTCs C1341/62, C1342/63, C1343/64 and/or C1344/65, are output.	A
DTC C1364/61 is output.	B

GO TO DTC (C1364/61) Click here

CHECK FOR FLUID LEAK

Check that there are no fluid leaks in the brake lines between the brake actuator assembly and the wheel cylinders.

Check that the brakes are not dragging.

OK
There are no fluid leaks or dragging.

Result

Proceed to
OK
NG

REPAIR OR REPLACE APPLICABLE PART

PERFORM AIR BLEEDING

Bleed the air from the front and rear brake systems.

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Result

Proceed to
NEXT

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY AND BRAKE ACTUATOR ASSEMBLY - BODY GROUND)

Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Disconnect the A11 and A8 skid control ECU assembly connectors.
Disconnect the A7 brake actuator assembly connector.

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

Standard Resistance

for RHD:
Tester connection	Condition	Specified condition
A8-8 (E) or A7-45 (E)- Body ground	Always	10 kΩ or higher
A8-9 (VCM) or A7-35 (VCM) - Body ground	Always	10 kΩ or higher
A8-18 (PRL) or A7-36 (PRL) - Body ground	Always	10 kΩ or higher
A8-21 (PAC1) or A7-46 (PAC1) - Body ground	Always	10 kΩ or higher
A8-30 (PMC1) or A7-38 (PMC1)- Body ground	Always	10 kΩ or higher
A8-31 (PCK1) or A7-37 (PCK1)- Body ground	Always	10 kΩ or higher
A8-32 (PFR) or A7-34 (PFR) - Body ground	Always	10 kΩ or higher
A11-15 (E2) or A7-44 (E2) - Body ground	Always	10 kΩ or higher
A11-16 (VCM2) or A7-40 (VCM2) - Body ground	Always	10 kΩ or higher
A11-23 (PFL) or A7-39 (PFL) - Body ground	Always	10 kΩ or higher
A11-24 (PRR) or A7-41 (PRR)- Body ground	Always	10 kΩ or higher
A11-28 (PMC2) or A7-43 (PMC2) - Body ground	Always	10 kΩ or higher
A11-29 (PCK2) or A7-42 (PCK2)- Body ground	Always	10 kΩ or higher

for LHD:
Tester connection	Condition	Specified condition
A8-8 (E) or A7-14 (E)- Body ground	Always	10 kΩ or higher
A8-9 (VCM) or A7-10 (VCM) - Body ground	Always	10 kΩ or higher
A8-18 (PRL) or A7-11 (PRL) - Body ground	Always	10 kΩ or higher
A8-21 (PAC1) or A7-15 (PAC1) - Body ground	Always	10 kΩ or higher
A8-30 (PMC1) or A7-13 (PMC1)- Body ground	Always	10 kΩ or higher
A8-31 (PCK1) or A7-12 (PCK1)- Body ground	Always	10 kΩ or higher
A8-32 (PFR) or A7-9 (PFR) - Body ground	Always	10 kΩ or higher
A11-15 (E2) or A7-16 (E2) - Body ground	Always	10 kΩ or higher
A11-16 (VCM2) or A7-5 (VCM2) - Body ground	Always	10 kΩ or higher
A11-23 (PFL) or A7-4 (PFL) - Body ground	Always	10 kΩ or higher
A11-24 (PRR) or A7-6 (PRR)- Body ground	Always	10 kΩ or higher
A11-28 (PMC2) or A7-8 (PMC2) - Body ground	Always	10 kΩ or higher
A11-29 (PCK2) or A7-7 (PCK2)- Body ground	Always	10 kΩ or higher

Result

Result
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

READ VALUE USING GTS (WHEEL CYLINDER PRESSURE SENSOR)

Reconnect the A11 and A8 skid control ECU assembly connectors.
Reconnect the A7 brake actuator assembly connector.
Connect an LSPV gauge set.
Connect the GTS to the DLC3.
Turn the engine switch on (IG).

Select the Data List on the GTS.

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Chassis > ABS/VSC/TRC > Data List

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	Brake pedal released: 0.30 to 0.70 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	Brake pedal released: 0.30 to 0.70 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	Brake pedal released: 0.30 to 0.70 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	Brake pedal released: 0.30 to 0.70 V	Reading increases when brake pedal is depressed

Chassis > ABS/VSC/TRC > Data List

Tester Display
FR W/C Sensor
FL W/C Sensor
RR W/C Sensor
RL W/C Sensor

Check the output values of the wheel cylinder pressure sensor at each hydraulic pressure level during the electronically controlled brake system control.

Standard Voltage

for Front Wheel Cylinder
Hydraulic Pressure MPa (kgf/cm², psi)	FR W/C Sensor (Tester Display)	FL W/C Sensor (Tester Display)
1.76 (17.9, 255)	0.66 to 1.06 V	0.66 to 1.06 V
5.22 (53.2, 757)	1.37 to 1.77 V	1.37 to 1.77 V

for Rear Wheel Cylinder
Hydraulic Pressure MPa (kgf/cm², psi)	RR W/C Sensor (Tester Display)	RL W/C Sensor (Tester Display)
1.76 (17.9, 255)	0.66 to 1.06 V	0.66 to 1.06 V
5.22 (53.2, 757)	1.37 to 1.77 V	1.37 to 1.77 V

Result

Proceed to
OK
NG

REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here
REPLACE BRAKE ACTUATOR ASSEMBLY for LHD: Click here

CHECK BRAKE DISC

Turn the engine switch off.
Disconnect the A3 brake pedal stroke sensor assembly connector.

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

REPLACE BRAKE DISC

RECONFIRM DTC

Reconnect the A3 brake pedal stroke sensor assembly connector.
Clear the DTCs.

Click here

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

Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRC > Trouble Codes

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

USE SIMULATION METHOD TO CHECK Click here

REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here
REPLACE BRAKE ACTUATOR ASSEMBLY for LHD: Click here