Inspection Procedure 5

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Part 2 Of 2:

INSPECTION PROCEDURE 5: 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 is set.

CIRCUIT OPERATION
^ The ABS-ECU controls the illumination of the TCL warning light by turning the transistor in the ECU "ON" and "OFF."
^ The ABS-ECU illuminates the TCL warning light on start-up. It 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-03.





1. Disconnect ABS-ECU connector A-03.
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-03 terminal 15 and combination meter connector C-29 terminal 31.











NOTE: After inspecting intermediate connector C-12, inspect the wire. If intermediate connector C-12 is damaged, repair or replace it. If the connector has been repaired, go to Step 3.

Q: Are any harness wires between ABS-ECU connector A-03 terminal 15 and combination meter connector C-29 terminal 31 damaged?
YES: Repair damaged wire(s) and then go to Step 3.
NO: Go to Step 3.

STEP 3. Retest the system.
Q: Does the TCL warning light turn off 3 seconds after start-up?
YES: The procedure is complete.
NO: Return to Step 1.