| DTC Code | DTC Name |
|---|---|
| C1214 | 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 the master cylinder and each wheel cylinder according to the servo 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 | Hydraulic Control System Malfunction | 431 432 436 438 439 440 441 442 |
|
|
Electronically controlled brake system DTC |
CAUTION / NOTICE / HINT
Note
After replacing the brake booster with master cylinder assembly or brake actuator assembly, perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".
PROCEDURE
CUSTOMER PROBLEM ANALYSIS (CHECK CONDITION WHEN MALFUNCTION OCCURRED) AND FREEZE FRAME DATA
Interview the customer to check the vehicle conditions when the brake warning light / yellow (minor malfunction) illuminated.
Using the GTS, read the "Shift Lever Position", "Vehicle Speed", "Yaw Rate Sensor", "Steering Angle Sensor", "Reaction Force Pressure", "Servo Pressure" and "Accumulator Pressure" of the Freeze Frame Data stored when the DTC was stored.
Also, read the Freeze Frame Data stored when the DTC was stored and make a note of the INF codes.
Note
Make sure to make a note of the INF codes as they are used in a following step.
Tech Tips
Freeze Frame Data is only stored once when a DTC is stored.
If other DTCs are output, repair any malfunctions related to those DTCs first, and then reproduce the conditions that caused DTC C1214 to be stored based on the interview with the customer.
| Result | ||
|---|---|---|
|
| NEXT |
|
CHECK FOR FLUID LEAK
Check that there are no fluid leaks in the brake lines between the brake booster with master cylinder assembly and the wheel cylinders.
Check that there is no brake fluid leaks from the brake booster with master cylinder assembly or brake actuator assembly body.
Check that the brakes are not dragging.
| OK |
|---|
| There are no fluid leaks or dragging. |
| Result | |||
|---|---|---|---|
|
| NG |
|
REPAIR OR REPLACE APPLICABLE PART |
| OK |
|
PERFORM AIR BLEEDING
Clear the DTCs.
Perform the air bleeding procedure in Bleed Brake System.
| Result | ||
|---|---|---|
|
| NEXT |
|
CHECK BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY AND BRAKE ACTUATOR ASSEMBLY (ACTUATOR SIDE)
Turn the power switch off.
Make sure that there is no looseness at the locking part and the connecting part of the connectors.
| OK |
|---|
| The connector is securely connected. |
Disconnect the A39 skid control ECU (brake booster with master cylinder assembly) connector 2 minutes after the power switch is turned off.
Disconnect the A40 brake actuator assembly connector (for LHD).
Disconnect the A41 brake actuator assembly connector (for RHD).
Check both the connector case and the terminals for deformation and corrosion.
| OK |
|---|
| No deformation or corrosion. |
| Result | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| B |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
| C |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
| D |
|
REPLACE BRAKE ACTUATOR ASSEMBLY Click here |
| E |
|
REPLACE BRAKE ACTUATOR ASSEMBLY Click here |
| A |
|
CHECK HARNESS AND CONNECTOR (VEHICLE SIDE)
Reconnect the A39 skid control ECU (brake booster with master cylinder assembly) connector.
Reconnect the A40 brake actuator assembly connector (for LHD).
Reconnect the A41 brake actuator assembly connector (for RHD).
Measure the voltage and resistance on the wire harness side.
| OK |
|---|
| Voltage and resistance readings are all normal. |
| Result | |||
|---|---|---|---|
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
| OK |
|
CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)
Turn the power switch off.
Make sure that there is no looseness at the locking part and the connecting part of the connectors.
| OK |
|---|
| The connector is securely connected. |
Disconnect the A39 skid control ECU (brake booster with master cylinder assembly) connector.
Disconnect the A40 brake actuator assembly connector (for LHD).
Disconnect the A41 brake actuator assembly connector (for RHD).
Check both the connector case and the terminals for deformation and corrosion.
| OK |
|---|
| No deformation or corrosion. |
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
| Result | |||
|---|---|---|---|
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
| OK |
|
CHECK INFORMATION CODE
Reconnect the A39 skid control ECU (brake booster with master cylinder assembly) connector.
Reconnect the A40 brake actuator assembly connector (for LHD).
Reconnect the A41 brake actuator assembly connector (for RHD).
Reconfirm the INF codes noted in step 1.
| Result | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
| B |
|
READ VALUE USING GTS (SERVO PRESSURE) Click here |
| C |
|
RECONFIRM DTC Click here |
| D |
|
INSPECT BRAKE PEDAL STROKE SENSOR ASSEMBLY OUTPUT VOLTAGES AND WHEEL CYLINDER PRESSURE Click here |
| A |
|
READ VALUE USING GTS (SERVO PRESSURE)
Connect an LSPV gauge set.
Select the Data List on the GTS.
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Servo Pressure | Pressure value of servo | Min.: 0.00 MPa, Max.: 24.48 MPa | Brake pedal released: 0.00 to 2.10 MPa | Brake pedal is being depressed: Changes in proportion to the depression force of the brake pedal |
| Tester Display |
|---|
| Servo Pressure |
Depress the brake pedal slowly and check the servo pressure output values with respect to the wheel cylinder pressure values for each wheel.
| Standard Pressure | ||||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
|
| Result | ||||||||
|---|---|---|---|---|---|---|---|---|
|
| B |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
| C |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
| A |
|
CHECK BRAKE DISC
Turn the power switch off.
Disconnect the A44 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 | |||
|---|---|---|---|
|
| NG |
|
REPLACE BRAKE DISC |
| OK |
|
RECONFIRM DTC
Turn the power switch off.
Reconnect the A44 brake pedal stroke sensor assembly connector.
Clear the DTCs.
Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.
Turn the power switch off and wait for 2 minutes or more.
Turn the power switch on (IG).
Check if the same DTC is output.
| Result | ||||||||
|---|---|---|---|---|---|---|---|---|
|
Tech Tips
If the DTC is no longer output, it can be suspected that it was output due to an improperly connected connector.
| A |
|
USE SIMULATION METHOD TO CHECK Click here |
| B |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
| C |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
READ VALUE USING GTS (SERVO PRESSURE)
Connect an LSPV gauge set.
Select the Data List on the GTS.
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Servo Pressure | Pressure value of servo | Min.: 0.00 MPa, Max.: 24.48 MPa | Brake pedal released: 0.00 to 2.10 MPa | Brake pedal is being depressed: Changes in proportion to the depression force of the brake pedal |
| Tester Display |
|---|
| Servo Pressure |
Depress the brake pedal slowly and check the servo pressure output values with respect to the wheel cylinder pressure values for each wheel.
| Standard Pressure | ||||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
|
| Result | ||||||||
|---|---|---|---|---|---|---|---|---|
|
| B |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
| C |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
| A |
|
CHECK BRAKE DISC
Turn the power switch off.
Disconnect the A44 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 | |||
|---|---|---|---|
|
| NG |
|
REPLACE BRAKE DISC |
| OK |
|
READ VALUE USING GTS (BRAKE PEDAL STROKE SENSOR ASSEMBLY)
Turn the power switch off.
Reconnect the A44 brake pedal stroke sensor assembly connector.
Clear the DTCs.
Turn the power switch off.
Mount a pedal effort gauge.
Turn the power switch on (READY) and depress the brake pedal once.
Tech Tips
Depress the brake pedal after turning the power switch on (READY) to set the vehicle to linear mode (switching solenoid (SSA) on).
Select the Data List on the GTS.
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Stroke Sensor | Brake pedal stroke sensor assembly | Min.: 0.00 V, Max.: 5.00 V | Brake pedal released: 0.65 to 1.35 V | Reading increases when brake pedal is depressed |
| Stroke Sensor2 | Brake pedal stroke sensor assembly 2 | Min.: 0.00 V, Max.: 5.00 V | Brake pedal released: 3.65 to 4.35 V | Reading decreases when brake pedal is depressed |
| Tester Display |
|---|
| Stroke Sensor |
| Stroke Sensor2 |
Depress the brake pedal slowly and check the brake pedal stroke sensor assembly output voltages with respect to brake pedal depression force.
Note
Perform this procedure in linear mode (switching solenoid (SSA) on).
| Standard Voltage | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| Result | ||||||||
|---|---|---|---|---|---|---|---|---|
|
| B |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
| C |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
| A |
|
RECONFIRM DTC
Clear the DTCs.
Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.
Turn the power switch off and wait for 2 minutes or more.
Turn the power switch on (IG).
Check if the same DTC is output.
| Result | ||||||||
|---|---|---|---|---|---|---|---|---|
|
Tech Tips
If the DTC is no longer output, it can be suspected that it was output due to an improperly connected connector.
| A |
|
USE SIMULATION METHOD TO CHECK Click here |
| B |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
| C |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
RECONFIRM DTC
Clear the DTCs.
Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.
Turn the power switch off and wait for 2 minutes or more.
Turn the power switch on (IG).
Check if the same DTC is output.
| Result | ||||||||
|---|---|---|---|---|---|---|---|---|
|
Tech Tips
If the DTC is no longer output, it can be suspected that it was output due to an improperly connected connector.
| A |
|
USE SIMULATION METHOD TO CHECK Click here |
| B |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
| C |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
INSPECT BRAKE PEDAL STROKE SENSOR ASSEMBLY OUTPUT VOLTAGES AND WHEEL CYLINDER PRESSURE
Mount a pedal effort gauge.
Disconnect the A12 brake booster pump assembly connector.
Depress the brake pedal 10 times or more until it becomes hard.
Tech Tips
Depressing the brake pedal with the connector of the brake booster pump assembly disconnected drops the accumulator pressure to approximately 0 MPa.
Connect an LSPV gauge set.
Select the Data List on the GTS.
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Stroke Sensor | Brake pedal stroke sensor assembly | Min.: 0.00 V, Max.: 5.00 V | Brake pedal released: 0.65 to 1.35 V | Reading increases when brake pedal is depressed |
| Tester Display |
|---|
| Stroke Sensor |
Slowly depress the brake pedal and check the brake pedal stroke sensor assembly output voltages and the wheel cylinder pressure with respect to brake pedal depression force.
Note
Check the wheel cylinder pressure with the switching solenoid (SSA, SGH) off and an accumulator pressure of 0 MPa.
| Standard Pressure | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
|||||||||
|
| Result | ||||||||
|---|---|---|---|---|---|---|---|---|
|
| B |
|
REPLACE BRAKE ACTUATOR ASSEMBLY Click here |
| C |
|
REPLACE BRAKE ACTUATOR ASSEMBLY Click here |
| A |
|
RECONFIRM DTC
Turn the power switch off.
Reconnect the A12 brake booster pump assembly connector.
Clear the DTCs.
Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.
Turn the power switch off and wait for 2 minutes or more.
Turn the power switch on (IG).
Check if the same DTC is output.
| Result | ||||||||
|---|---|---|---|---|---|---|---|---|
|
Tech Tips
If the DTC is no longer output, it can be suspected that it was output due to an improperly connected connector.
| A |
|
USE SIMULATION METHOD TO CHECK Click here |
| B |
|
REPLACE BRAKE ACTUATOR ASSEMBLY Click here |
| C |
|
REPLACE BRAKE ACTUATOR ASSEMBLY Click here |