Inspection Procedure 3

INSPECTION PROCEDURE 3: The TCL Indicator 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 indicator light by turning it "ON" and "OFF."
- The ABS-ECU illuminates the TCL indicator light on startup. If turns off the light after 3 seconds when the ABS-ECU completes the self-check.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably the 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 the ABS-ECU connector A-02.
1. Disconnect ABS-ECU connector A-02.
2. Turn the ignition switch to the "ON" position.

Q:Is the TCL indicator 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 wires between ABS-ECU connector A-02 and combination meter connector C-101.

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 and combination meter connector C-101 damaged?
YES:Repair it and then go to Step 3.
NO:Go to Step 3.
STEP: 3. Check symptom.
Q:Does the TCL indicator light turn off 3 seconds after startup?
YES: This diagnosis is complete.
NO:Return to Step 1.