Inspection Procedure 2: The ABS warning lamp remains illuminated after the engine is started.












caution If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Diagnose the CAN bus lines before the diagnosis codes (Refer to GROUP 54C, CAN Bus Diagnostics Table .).

OPERATION



  • ABS-ECU send the illumination signal of ABS warning lamp to the combination meter.
  • ABS-ECU operates the ABS warning lamp and the ABS warning lamp for three seconds after the ignition switch is turned "ON" position for bulb check.

COMMENT



PROBABLE CAUSES



  • Malfunction of the combination meter
  • Damaged wiring harness and connectors
  • Malfunction of the ABS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
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 Diagnostics Table .). Then go to Step 6.

STEP 2. Connector check: A-01 ABS-ECU connector, C-13 intermediate connector, C-113 combination meter connector

Q. Is the check result normal?
Go to Step 3.
Repair or replace it. Then go to Step 6.

STEP 3. Resistance measurement at C-113 combination meter connector
(1)Disconnect the A-01 ABS-ECU connector and C-113 combination meter connector.
(2)Resistance between the C-113 combination meter connector terminal No.19 and the body earth.
OK: No continuity

Q. Is the check result normal?
Go to Step 4.
A short circuit may be present in the earth circuit. Repair the wiring harness between the A-01 ABS-ECU terminal No.16 and the C-113 combination meter connector terminal No.19. Then go to Step 6.

STEP 4. M.U.T.-III diagnosis code

Q. Is any diagnosis code set?
Refer to Diagnosis Code Chart (Refer to .). Then go to Step 6.
Replace the combination meter assembly (Refer to GROUP 54A, Combination Meter Assembly .). Then go to Step 5.

STEP 5. Retest the system

Q. Turn the ignition switch to the "ON" position. Does the ABS warning lamp illuminate for three seconds, and then go out after the engine starts?
The procedure is complete.
Replace the hydraulic unit (integrated with ABS-ECU) (Refer to .). Then go to Step 6.

STEP 6. Retest the system

Q. Turn the ignition switch to the "ON" position. Does the ABS warning lamp illuminate for three seconds, and then go out after the engine starts?
The procedure is complete.
Return to Step 1.