Inspection Procedure 6: Abnormality in brake operation




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 diagnosis code is not detected.

PROBABLE CAUSES



  • Hydraulic unit (HU) malfunction

DIAGNOSIS PROCEDURE


STEP 1. Diagnosis code check


Q. Is the check result normal?

Go to Step 2.
Troubleshoot for the relevant diagnosis code (Refer to ).

STEP 2. Hydraulic unit (Integrated with ABS-ECU) check


Check that the brake tube is installed to the hydraulic unit (integrated with ABS-ECU) correctly (Refer to ).

Q. Is the check result normal?

Go to Step 3.
Connect the brake tubes correctly, repair the external brake lines, or Replace the ABS-ECU (Refer to ).

STEP 3. Retest the system.


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

Check the brake-related parts, and repair if necessary, and then go to Step 4 .
Go to Step 4.

STEP 4. Hydraulic unit check


Perform the following actuator tests.

  • Item No.01: FL wheel ABS drive
  • Item No.02: FR wheel ABS drive
  • Item No.03: RL wheel ABS drive
  • Item No.04: RR wheel ABS drive

Q. Is the check result normal?

This diagnosis is complete.
Replace the ABS-ECU (Refer to ).