Repair Procedures: Inspection

Check installation status of BBVPS and Vacuum hose or damage of vacuum hose.
Connect GDS to DLC (Data Link Cable).
Warm up the engine to normal operating temperature.
Monitor "BBVPS" parameter on GDS.

Fig 1: Display - BBVPS Screen (Idle Status)
Courtesy of KIA MOTORS AMERICA, INC.

Fig 2: Display - BBVPS Screen (Brake Pressure Signal)
Courtesy of KIA MOTORS AMERICA, INC.

NOTE: With a brake partial vacuum that is too low, the ISG function also starts without activity on the part of the driver.
Insufficient brake partial vacuum can lead to safety risks during braking maneuvers, when rolling on an incline. To prevent this, the engine is started.
(Refer to "DTC P0557, P0558" in DTC INDEX article)