NOTES WITH REGARD TO DIAGNOSIS

1. The hydraulic brake booster (HBB) accumulates a high-pressure fluid in the accumulator by operating the pump motor, thus boosting the brake. Therefore, the pump motor generates an operating sound, but it indicates that the HBB is operating correctly, and it is not a malfunction.
   
2. Diagnosis detection condition can vary depending on the diagnosis code. Make sure that checking requirements listed in the