[Previous][Next]
Inspection Procedure 4: ABS warning light does not illuminate when the ignition switch is turned to ON.
 
 
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 (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • Before replacing the ECU, ensure that the communication circuit is normal.
 
 
OPERATION
  • ASC-ECU sends the illumination request signal of the ABS warning light to the combination meter through ETACS-ECU via CAN communication.
  • ASC-ECU illuminates the ABS warning light 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 ASC-ECU.
 
 
 
PROBABLE CAUSES
  • Malfunction of ETACS-ECU
  • Combination meter malfunction
  • ASC-ECU malfunction
  • Malfunction of coding data for ETACS-ECU
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE) Special Function.
Perform the following special function by the combination meter system, and check if the ABS warning light illuminates (Refer to GROUP 54A - Combination Meter/Special function table ).
  • Item No.9: Indicator (AUTO)
Is the check result normal?
Go to Step 2.
Replace the combination meter (Refer to GROUP 54A - Combination Meter ).
 
STEP 2. ETACS-ECU coding data check.
Use scan tool (M.U.T.-IIISE) to check if coding data stored in ETACS-ECU is normal
OK: A.S.C. : Present
Is the check result normal?
Go to Step 3.
Repair the coding data or replace ETACS-ECU.
 
STEP 3. Retest the system.
Does the ABS warning light turn ON and OFF normally?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ) and then go to Step 4.
 
STEP 4. Retest the system.
Does the ABS warning light turn ON and OFF normally?
This diagnosis is complete.
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).