STEP 3. Check whether the DTC is set again.
Check again if the DTC is set.(1) Erase the DTC.
(2) Turn the ignition switch to the LOCK (OFF) position.
(3) Turn the ignition switch to the ON position.
(4) Check if the DTC is set.
Is the DTC U0121 set?
Replace the hydraulic unit (ASC-ECU) (Refer to GROUP 35C - Hydraulic Unit ). Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).