Component Inspection

Ignition "OFF".
Ignition "ON" & Engine "OFF".
Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode.
Using a scantool, Clear DTC.
Check if the pressure sensor's service data shows '0 bar' on the scantool while not pressing the brake pedal.
Check if the pressure sensor's service data rises on the scantool while pressing the brake pedal.
Is the pressure sensor's data unusually shown?
YES
- Substitute with a known-good HECU and check for proper operation.
  If problem is corrected, replace HECU and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  
  * In a case of replacing HECU, operate "Steering Angle Sensor Calibration" by scantool.
NO
- This fault is intermittently caused by pressure sensor.
  Go to "VERIFICATION OF VEHICLE REPAIR " procedure.