ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1214/62

DESCRIPTION

The skid control ECU controls braking force according to the hybrid control system regenerative braking force and inputs 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 solenoid valve.

• Line pressure drops during air bleeding.

• Brake pad is replaced.

• Rotor is replaced.

  Tech Tips

  When replacing the brake pad, retracting the brake calipers piston and attaching a new brake pad will greatly increase the clearance between the brake pad and brake disc, which will likely cause these DTCs to be set the next time the brake pedal is depressed. As there is not malfunction, clear the DTCs.

INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR FLUID LEAK

   
   

   1. Check that there is no fluid leaks in the brake line between the brake actuator and the wheel cylinder.

   2. Check that the brake is not dragging.

      OK
      There is no fluid leaks or dragging.

   
   

   NG

   REPAIR OR REPLACE APPLICABLE PART

   OK

2. PERFORM AIR BLEEDING

   
   

   1. Clear the DTCs Click here.

   2. Perform the air bleeding procedure in Bleed Brake System Click here.

   
   

   NEXT

3. CHECK BRAKE BOOSTER WITH MASTER CYLINDER (ACTUATOR SIDE)

   
   

   1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

   2. Disconnect the skid control ECU connector 2 minutes after the power switch is turned off.

   3. Check both the connector case and the terminal for deformation and corrosion.

      OK
      No deformation or corrosion.

      Result
      Result Proceed to OK A NG (for LHD) B NG (for RHD) C

   
   

   B

   REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

   C

   REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

   A

4. CHECK HARNESS AND CONNECTOR (VEHICLE SIDE)

   
   

   1. Measure the voltage and resistance on the wire harness side Click here.

      OK
      Voltage and resistance readings are all normal.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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

   
   

   1. Reconnect the skid control ECU connector.

   2. Connect an LSPV gauge set.

   3. Connect the intelligent tester to the DLC3.

   4. Turn the power switch on (IG).

   5. Select the Data List on the intelligent tester Click here.

      ABS/VSC/TRC

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Wheel Cylinder Pressure Sensor	Wheel cylinder pressure sensor / Min.: 0 V, Max.: 5 V	When brake pedal released: 0.1 to 0.9 V	Reading increases when brake pedal is depressed

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

      Standard Voltage
      for Front Wheel Cylinder Pressure Sensor 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 Pressure Sensor 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
      Result Proceed to OK A NG (for LHD) B NG (for RHD) C

   
   

   B

   REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

   C

   REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

   A

6. CHECK BRAKE DISC

   
   

   1. Turn the power switch off.

   2. Disconnect the brake pedal stroke sensor connector.

   3. Perform a road 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.

      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 wheel cylinder piston vibration during electronically controlled brake system control.

      • If the brake pedal stroke sensor 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 driving the vehicle, so disconnect the stroke sensor connector before continuing with inspection.

      • Disc uneven wear can be checked by measuring the disc thickness variation Click here for front, or Click here for rear).

   
   

   NG

   REPLACE BRAKE DISC

   OK

7. RECONFIRM DTC

   
   

   1. Reconnect the brake pedal stroke sensor connector.

   2. Clear the DTCs Click here.

   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 recorded Click here.

      Result
      Result Proceed to DTC (C1214/62) is not output A DTC (C1214/62) is output (for LHD) B DTC (C1214/62) is output (for RHD) C

      Tech Tips

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

   
   

   B

   REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

   C

   REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

   A

   CHECK FOR INTERMITTENT PROBLEMS Click here