DTC C1214-62: Hydraulic Control System Malfunction [06/2015 - ]: Procedure

1. 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.
2. Check that the brakes are not dragging.

   OK

   There are no fluid leaks or dragging.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE APPLICABLE PART 

Result: 

OK 

See step  2

1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
2. Disconnect the A63 skid control ECU (brake booster with master cylinder assembly) connector 2 minutes after the power switch is turned off.
3. Check both the connector body and the terminals for deformation and corrosion.

   OK

   No deformation or corrosion.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

Result: 

OK 

See step  3

1. Reconnect the A63 skid control ECU (brake booster with master cylinder assembly) connector.
2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [06/2015 - ]

   Chassis > ABS/VSC/TRAC > Clear DTCs 

3. Perform the air bleeding procedure in Bleed Brake System.

   Refer to BLEEDING [06/2015 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

1. Disconnect the A63 skid control ECU (brake booster with master cylinder assembly) connector.
2. Measure the voltage and resistance on the wire harness side.

   Refer to TERMINALS OF ECU [06/2015 - ]

   OK

   Voltage and resistance readings are all normal.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Reconnect the A63 skid control ECU (brake booster with master cylinder assembly) connector.
2. Connect an LSPV gauge set.
3. Connect the Techstream to the DLC3.
4. Turn the power switch on (IG).
5. Select the Data List on the Techstream.

   Refer to DATA LIST / ACTIVE TEST [06/2015 - ]

   Chassis > ABS/VSC/TRAC > 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/TRAC > Data List 

   Tester Display
   Wheel Cylinder Pressure Sensor

6. 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

Result: 

NG 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

Result: 

OK 

See step  6

1. Turn the power switch off.
2. Disconnect the A9 brake pedal stroke sensor assembly connector.
3. 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.

   HINT: 

   • 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: Refer to INSPECTION [06/2015 - ]

     For Rear Brake: Refer to INSPECTION [06/2015 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE BRAKE DISC 

Result: 

OK 

See step  7

1. Reconnect the A9 brake pedal stroke sensor assembly connector.
2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [06/2015 - ]

   Chassis > ABS/VSC/TRAC > Clear DTCs 

3. Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.
4. Check if the same DTC is output.

   Refer to DTC CHECK / CLEAR [06/2015 - ]

   Chassis > ABS/VSC/TRAC > Trouble Codes 

   Result

   Result	Proceed to
   DTC C1214/62 is not output.	A
   DTC C1214/62 is output.	B

   HINT: 

   If the DTC is no longer output, it can be suspected that it was output due to an improperly connected connector.

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2015 - 11/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

Result: 

B 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ]