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-line diagnostic flow ).

OPERATION



  • ABS-ECU send the illumination signal of ABS warning lamp to the combination meter via the CAN communication.
  • 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 harness, connector
  • Malfunction of the ABS-ECU

DIAGNOSIS

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


caution Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK" (OFF) position.
(1)Connect M.U.T.-III to the 16-pin diagnosis connector.
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the check result normal?

Go to Step 2.

Repair the CAN bus lines (Refer to GROUP 54C, Diagnosis-Can Bus Diagnostic Chart ). Then go to Step 4.

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


caution Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK" (OFF) position.
(1)Turn the ignition switch to the "ON" position.
(2)Erase the diagnosis code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to the "ON" position.
(5)Check if the diagnosis code is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is any diagnosis code set?

Refer to Diagnosis Code Chart . Then go to Step 4.

Go to Step 3.

STEP 3. M.U.T.-III other system diagnosis code


(1)
caution Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK" (OFF) position.
Connect M.U.T.-III to the 16-pin diagnosis connector.
(2)Turn the ignition switch to the "ON" position.
(3)Check for Combination meter system diagnosis code.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
(5)Disconnect M.U.T.-III.

Q. Is code No.U1102 set?

Replace the hydraulic unit (integrated with ABS-ECU). Then go to Step 4.

Replace the combination meter assembly (Refer to GROUP 54A, Combination Meter Assembly ). Then go to Step 4.

STEP 4. Retest the system

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