ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1214/62

DTC Code	DTC Name
C1214/62	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 each wheel cylinder according to the wheel cylinder pressure sensor.

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 a 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
C1214/62	Hydraulic Control System Malfunction	431 432 433 434 435 436 437 438	INF Code: 431 Decrease in hydraulic pressure control performance. (Pressure increase malfunction) INF Code: 432 Decrease in hydraulic pressure control performance. (Pressure decrease malfunction) INF Code: 433 Malfunctions such as leaks occur in the SLA valve. INF Code: 434, 435 Malfunctions such as leaks occur in the SLR valve. INF Code: 436, 437 Decrease in hydraulic pressure control performance. INF Code: 438 Malfunctions such as leaks occur in a hydraulic circuit valve.	INF Code: 431, 432, 433, 434, 435, 436, 437 Brake fluid leaks Brake disc rotor excessive wear Brake actuator (Brake booster with master cylinder assembly) INF Code: 438 Brake actuator (Brake booster with master cylinder assembly)	Electronically controlled brake system DTC

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1214/62

Hydraulic Control System Malfunction

431

432

433

434

435

436

437

438

INF Code: 431

Decrease in hydraulic pressure control performance.

(Pressure increase malfunction)

INF Code: 432

Decrease in hydraulic pressure control performance.

(Pressure decrease malfunction)

INF Code: 433

Malfunctions such as leaks occur in the SLA valve.

INF Code: 434, 435

Malfunctions such as leaks occur in the SLR valve.

INF Code: 436, 437

Decrease in hydraulic pressure control performance.

INF Code: 438

Malfunctions such as leaks occur in a hydraulic circuit valve.

INF Code: 431, 432, 433, 434, 435, 436, 437

Brake fluid leaks

Brake disc rotor excessive wear

Brake actuator (Brake booster with master cylinder assembly)

INF Code: 438

Brake actuator (Brake booster with master cylinder assembly)

Electronically controlled brake system DTC

CAUTION / NOTICE / HINT

Note

When replacing the brake actuator (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.

Click here

Tech Tips

When C1364/61 is output together with C1214/62, inspect and repair the trouble areas indicated by C1364/61 first.

Click here

PROCEDURE

CHECK FOR FLUID LEAK

Check that there are no fluid leaks in the brake lines between the brake actuator (brake booster with master cylinder 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

CHECK BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (ACTUATOR SIDE)

Make sure that there is no looseness at the locking part and the connecting part of the connector.
Disconnect the A144 skid control ECU (brake booster with master cylinder assembly) connector 2 minutes after the power switch is turned off.

Check both the connector body and the terminals for deformation and corrosion.

OK
No deformation or corrosion.

Result

Proceed to
OK
NG

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here

PERFORM AIR BLEEDING

Clear the DTCs.

Click here

Chassis > ABS/VSC/TRC > Clear DTCs

Perform the air bleeding procedure in Bleed Brake System.

Click here

Result

Proceed to
NEXT

CHECK HARNESS AND CONNECTOR (VEHICLE SIDE)

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

READ VALUE USING GTS (WHEEL CYLINDER PRESSURE SENSOR)

Reconnect the A144 skid control ECU (brake booster with master cylinder assembly) connector.
Connect an LSPV gauge set.
Connect the GTS to the DLC3.
Turn the power switch on (IG).

Select the Data List on the GTS.

Click here

Chassis > ABS/VSC/TRC > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Wheel Cylinder Pressure Sensor	Wheel cylinder pressure sensor	Min.: 0.00 V, Max.: 5.00 V	Brake pedal released: 0.10 to 0.90 V	Reading increases when brake pedal is depressed

Chassis > ABS/VSC/TRC > Data List

Tester Display
Wheel Cylinder Pressure Sensor

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

Standard Voltage

for Front Wheel Cylinder LH
Hydraulic Pressure (MPa (kgf/cm², psi))	Wheel Cylinder Pressure Sensor (V)
2.0 (20.4, 290)	0.53 to 1.33
5.0 (51.0, 725)	1.12 to 1.92
7.0 (71.4, 1015)	1.52 to 2.32
10.0 (102.0, 1451)	2.14 to 2.94

for Front Wheel Cylinder RH
Hydraulic Pressure (MPa (kgf/cm², psi))	Wheel Cylinder Pressure Sensor (V)
2.0 (20.4, 290)	0.53 to 1.33
5.0 (51.0, 725)	1.12 to 1.92
7.0 (71.4, 1015)	1.52 to 2.32
10.0 (102.0, 1451)	2.14 to 2.94

Result

Proceed to
OK
NG

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here

CHECK BRAKE DISC

Turn the power switch off.
Disconnect the A133 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 15 inch Front Brake: Click here

for 16 inch Front Brake: Click here

for Rear Brake: Click here

Result

Proceed to
OK
NG

REPLACE BRAKE DISC

RECONFIRM DTC

Reconnect the A133 brake pedal stroke sensor assembly connector.
Clear the DTCs.

Click here

Chassis > ABS/VSC/TRC > Clear DTCs
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
DTC C1214/62 is not output.	A
DTC C1214/62 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.

USE SIMULATION METHOD TO CHECK Click here

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here