DTC C1214/62: Hydraulic Control System Malfunction: Procedure

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: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Perform the air bleeding procedure in Bleed Brake System. Refer to BLEEDING - Step 2 .

NEXT: Go to next step 

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.

NG → See step   8 

OK: Go to next step 

1. Measure the voltage and resistance on the wire harness side. Refer to TERMINALS OF ECU .

   OK

   Voltage and resistance readings are all normal.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the skid control ECU 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 .
   ABS/VSC/TRAC
   
   

   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 

   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

   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

NG → See step   8 

OK: Go to next step 

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.

   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 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 the vehicle is running, so disconnect the stroke sensor connector before continuing with inspection.
   • Disc uneven wear can be checked by measuring the disc thickness variation. Refer to INSPECTION for front, or INSPECTION for rear).

NG → REPLACE BRAKE DISC 

OK: Go to next step 

1. Reconnect the brake pedal stroke sensor connector.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR .
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. Refer to DTC CHECK / CLEAR .

   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.

B → See step   8 

A → See step   9