Component Inspection
- IG "OFF".
- IG "ON".
- Connect GDS and select "Diagnostic Trouble Codes (DTC)" mode.
- Using a GDS, Clear DTC.
- Check if the pressure sensor's service data shows '0 bar' on the GDS while not pressing the brake pedal.
- Use the GDS and check that the pressure sensor value rises 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.NOTE: In a case of replacing HECU, operate following functions
- "Steering Angle Sensor Calibration" for steering angle sensor offset correction (refer to C1261 STEERING ANGLE SENSOR NOT CALIBRATED ) -ESC only
- "Longitudinal Sensor Calibration" for Longitudinal sensor offset correction (refer to C1285 SENSOR CLUSTER CHANGE DETECTION_UNCALIBRATED ) - ESC only
NO
- This fault is intermittently caused by pressure sensor. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- 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.