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 ) -ESP (ESC) only
"Longitudinal Sensor Calibration" for Longitudinal sensor offset correction (refer to C1285 ) - ESP (ESC) only
"Variant Coding" for option coding (refer to C1702 )

NO

This fault is intermittently caused by pressure sensor. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.