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TROUBLESHOOTING ANTI-SKID BRAKING SYSTEM (ABS) 35B-47 STEP 4. ETACS-ECU coding data check − Pre- cautions before Service/Coding List ). Q: Is the check result normal? YES : Go to Step 6. NO : Go to Step 5. STEP 5. ETACS-ECU coding data check Q: Is the check result normal? YES : Go to Step 9. NO : Replace the ETACS-ECU (Refer to GROUP − ETACS-ECU ), and then go to Step 9. STEP 6. M.U.T.-III diagnosis code for other Q: Is the diagnosis code set? YES : Diagnose the combination meter (Refer to GROUP 54A − Combination Meter/Troubleshooting ). Then go to Step 9. NO : Go to Step 7. STEP 7. M.U.T.-III diagnosis code for other Q: Is the diagnosis code set? YES : Perform troubleshooting on ETACS-ECU (Refer to GROUP 54A − ETACS/Troubleshooting ). Then go to Step NO : Go to Step 8. STEP 8. Retest the system. Q: Does the ABS warning lamp turn ON and OFF normally? Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). NO : Replace the hydraulic unit (integrated with ). Then go to Step 9. STEP 9. Retest the system. Q: Does the ABS warning lamp turn ON and OFF normally? This diagnosis is complete. NO : Return to Step 1. Inspection Procedure 4: Brake warning lamp does not illuminate when the ignition switch is turned to CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior − CAN Bus Diagnostics Table ). • Before replacing the ECU, ensure that the communication circuit is normal. OPERATION • ABS-ECU sends the illumination request signal of the break warning lamp to the combination meter • ABS-ECU illuminates brake warning lamp via ETACS-ECU for approximately 3 seconds for COMMENTS ON TROUBLE SYMPTOM This may be caused by faults in the CAN bus line, PROBABLE CAUSES • Damaged wiring harness and connectors • Malfunction of ETACS-ECU • Malfunction of combination meter • Malfunction of ABS-ECU DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Q: Is the check result normal? YES : Go to Step 2. NO : Repair the CAN bus lines (Refer to GROUP − CAN Bus Diagnostics Table ). Then go to Step 7. |