ESP® Hydraulic Unit Operation Check

Check that basic brake system other than ESP® is in good condition.
Check that battery voltage is 11 V or higher.
Lift up vehicle.
Set transmission to neutral and release parking brake.
Turn each wheel gradually by hand to check if braked ragging occurs. If it does, correct.
Connect SUZUKI scan tool to data link connector (DLC) (1) with ignition switch OFF.
Special Tool

(A): SUZUKI scan tool

Fig 1: Connecting SUZUKI Scan Tool To Data Link Connector
Courtesy of SUZUKI OF AMERICA CORP.
Turn ignition switch to ON position and select menu press / depress in "HYDRAULIC CONTROL TEST" under "miscellaneous test" ("MISC. TEST") mode of SUZUKI scan tool.
Refer to SUZUKI scan tool operator's manual for further details.
Perform the following checks with help of another person.
- Depressurization check
  Step on brake pedal (1) and then select testing wheel by SUZUKI scan tool and the wheel (2) should be turned by another person's hand. At this time, check whether the wheel rotates freely due to brake depressurization.
- Pressurization check
  Step off brake pedal (1) and then select testing wheel by SUZUKI scan tool and the wheel (2) should be turned by another person's hand. At this time, check whether the wheel locks due to brake pressurization.
  
  NOTE: Pressurization/Depressurization by SUZUKI scan tool is available for 0.5 second.
  
  Fig 2: Rotating Freely Wheel
  Courtesy of SUZUKI OF AMERICA CORP.
Check for all 4-wheels condition respectively. If a faulty condition is found, replace hydraulic unit / control module assembly.
After completing the check, turn ignition switch to OFF position and disconnect SUZUKI scan tool from DLC.