Inspection Procedure 6

Inspection Procedure 6: Abnormality in brake operation

CAUTION:

- If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines CAN Bus Diagnostics Chart).

- Whenever ECU is replaced, ensure that the CAN bus lines are normal.

COMMENTS ON TROUBLE SYMPTOM

Although the cause of the trouble cannot be clearly resolved since it depends on the running status and road surface condition, the malfunction of the hydraulic circuit may occur if any DTC is not detected.

PROBABLE CAUSES

- Hydraulic unit (HU) malfunction

DIAGNOSTIC PROCEDURE

STEP 1. Hydraulic unit (integrated with ABS-ECU) check

Refer to Anti-Lock Braking System (ABS).

Q. Is the check result normal?

YES Go to Step 2.
NO Connect the brake tubes correctly, repair the external brake lines, or replace the hydraulic unit (integrated with ABS-ECU) (Refer to Anti-Lock Braking System (ABS)).
STEP 2. Retest the system.

Q. Can any fault be found with the brake operation?

YES Check the brake system related components except ABS.
NO The procedure is complete.