Inspection Procedure 3: ABS Warning Lamp does not Illuminate when Ignition Switch is Turned to the ON Position (Engine Stopped).


OPERATION

  • ABS-ECU sends the illumination request signal of the ABS warning lamp to the combination meter through ETACS-ECU via CAN communication.
  • ABS-ECU illuminates the ABS warning lamp via ETACS-ECU for approximately 3 seconds for valve check with the ignition switch turned to the ON position.

COMMENTS ON TROUBLE SYMPTOM
This may be caused by faults in the CAN bus line, ETACS-ECU, combination meter or ABS-ECU.

PROBABLE CAUSES

  • Damaged wiring harness and connectors
  • Malfunction of ETACS-ECU
  • Combination meter malfunction
  • ABS-ECU malfunction
  • Malfunction of coding data for ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnosis table ), and then go to Step 7.

STEP 2. M.U.T.-III diagnosis code

Q. Is any diagnosis code set?
Troubleshoot the relevant diagnosis code (Refer to ).
Go to Step 3.

STEP 3. M.U.T.-III actuator test
Perform the actuator test No. 07 of the combination meter system, and check if the ABS warning lamp illuminates.

Q. Is the check result normal?
Troubleshoot the combination meter (Refer to GROUP 54A - Combination meter, check chart for diagnosis codes ), and then go to Step 4.
Troubleshoot the combination meter (Refer to GROUP 54A - Combination meter, check chart for diagnosis codes ), and then go to Step 7.

STEP 4. Check coding data
Refer to GROUP 00 - Coding List .

Q. Is the check result normal?
Go to Step 5.
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ), and then go to Step 7.

STEP 5. M.U.T.-III other system diagnosis code
Using M.U.T.-III, check that the diagnosis code No. U0141 is not set by the combination meter system.

Q. Is the diagnosis code set?
Troubleshoot the combination meter (Refer to GROUP 54A - Combination meter, check chart for diagnosis codes ), and then go to Step 7.
Go to Step 6.

STEP 6. M.U.T.-III other system diagnosis code
Using M.U.T.-III, check that the diagnosis code No. U0121 is not set by the ETACS system.

Q. Is the diagnosis code set?
Troubleshoot the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU, check chart for diagnosis codes ), and then go to Step 7.
Replace the ABS-ECU (Refer to ), and then go to Step 7.

STEP 7. Retest the system.

Q. Does the ABS warning lamp turn ON and OFF normally?
The procedure is complete.
Return to Step 1.