Inspection Procedure 3

INSPECTION PROCEDURE 3: The ABS Warning Light Remains Illuminated after the Engine is Started.

Part 1 Of 2:

Part 2 Of 2:

CIRCUIT OPERATION
^ The ABS-ECU controls the illumination of the ABS warning light by turning the power transistor in the ABS-ECU ON and OFF.
^ The ABS-ECU illuminates the ABS warning light on start-up. It turns the light off after 3 seconds when the ABS-ECU completes the self-check.
^ When the ABS-ECU connector is disconnected, the circuit is grounded to illuminate the light by the connector lock switch OFF operation.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably the ABS-ECU malfunction.

TROUBLESHOOTING HINTS (The most likely causes for this condition:)
^ Malfunction of the ABS-ECU connector lock
^ Disconnection of the ABS-ECU connector
^ Damaged wiring harness or connector
^ Malfunction of the hydraulic unit (integrated with ABS-ECU)

DIAGNOSIS
Confirm the ABS-ECU connector connection and locking. If the connector is connected and locked to the ABS-ECU correctly, perform the following diagnosis.

Required Special Tool:
^ MB991223: Harness Set

STEP 1. Check the ABS warning light circuit at the intermediate connector C-94.





1. Disconnect the intermediate connector C-94.
2. Turn the ignition switch to the "ON" position.
Q: Does the ABS warning light illuminate?
YES: Go to Step 4.
NO: Go to Step 2.

STEP 2. Check the following connectors: the ABS-ECU connector A-02 and the intermediate connector C-94.








Q: Is any of the connectors damaged?
YES: Repair it and then go to Step 6.
NO: Go to Step 3.

STEP 3. Check the harness wire between the ABS-ECU connector A-02 (terminal 21) and the intermediate connector C-94 (terminal 16).








Q: Is the harness wire between the ABS-ECU connector A-02 (terminal 21) and the intermediate connector C-94 (terminal 16) damaged?
YES: Repair it and then go to Step 6.
NO: Replace the hydraulic unit (integrated with ABS-ECU) and then go to Step 6.

STEP 4. Check the following connectors: the combination meter connector C-42 and the intermediate connector C-94.








Q: Is any of the connectors damaged?
YES: Repair it and then go to Step 6.
NO: Go to Step 5.

STEP 5. Check the harness wire between the combination meter connector C-42 (terminal 24) and the intermediate connector C-94 (terminal 16).








Q: Is the harness wire between the combination meter connector C-42 (terminal 24) and the intermediate connector C-94 (terminal 16) damaged?
YES: Repair it and then go to Step 6.
NO: Replace the combination meter (printed circuit board) and then go to Step 6.

STEP 6. Check symptom.
Q: Does the ABS warning light turn off 3 seconds after start-up?
YES: This diagnosis is complete.
NO: Return to Step 1.