Inspection Procedure 2

INSPECTION PROCEDURE 2: The TCL Warning Light Remains Illuminated After the Engine is Started.

NOTE: This diagnosis procedure is limited to cases where communication with the scan tool is possible (ABS-ECU power supply is normal) and no diagnostic trouble code outputs.

CIRCUIT OPERATION
^ The ABS-ECU controls the illumination of the TCL warning light by turning it "ON" and "OFF."
^ The ABS-ECU illuminates the TCL warning light on startup. If turns the light off after 3 seconds when the ABS-ECU completes the self-check.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably hydraulic unit (integrated with ABS-ECU) malfunction.

TROUBLESHOOTING HINTS
^ Damaged wiring harness
^ Malfunction of the hydraulic unit (integrated with ABS-ECU)

DIAGNOSIS

Required Special Tool
^ MB991223: Harness Set

STEP 1. Check the power supply circuit at ABS-ECU connector A-02.





1) Disconnect ABS-ECU connector A-02.
2) Turn the-ignition switch to the "ON" position.

Q: Does the TCL warning light illuminate?
YES: Go to Step 2.
NO: Replace the hydraulic unit (integrated with ABS-ECU) and then go to Step 3.

STEP 2. Check the harness wire between ABS-ECU connector A-02 connector 20 and combination meter connector C-102 terminal 37.











NOTE: After inspecting intermediate connector C-212, inspect the wiring harness. If intermediate connector C-212 is damaged, repair or replace it. Then go to Step 3.

Q: Is the harness wire between ABS-ECU connector A-02 connector 20 and combination meter connector C-102 terminal 37 damaged?
YES: Repair it and then go to Step 3.
NO: Go to Step 3.

STEP 3. Check-symptom.
Q: Does the TCL warning light turn off 3 seconds after startup?
YES: The procedure is complete.
NO: Return to Step 1.