Inspection Procedure 10

Inspection Procedure 10: After ASC OFF switch is turned OFF, TCL/Skid control system cannot be disabled.













CAUTION:

- If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines CAN Bus Line Diagnostics Flow ).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION

The ETACS-ECU terminal No.15 is grounded by pressing the ASC OFF switch and illuminate the ASC OFF indicator. The ON/OFF state of the ASC OFF switch is transferred from ETACS-ECU to ASC-ECU via the CAN bus line.

COMMENTS ON TROUBLE SYMPTOM

This may be caused by the open circuit in the ASC OFF switch circuit.

PROBABLE CAUSES

- Damaged wiring harness and connectors
- ASC OFF switch malfunction
- ETACS-ECU malfunction
- The ASC OFF switch is pressed for more than 15 seconds (The system returns to normal by pressing the ignition switch to the "OFF" position and to the "ON" position).

DIAGNOSIS

STEP 1. ASC OFF switch check

Refer to Testing and Inspection.

Q. Is the check result normal?

YES Go to Step 2.
NO Replace ASC OFF switch (Refer to Service and Repair). Then go to Step 6.
STEP 2. Connector check: C-412 ETACS-ECU connector, C-27 intermediate connector, C-30 ASC OFF switch connector

Q. Is the check result normal?

YES Go to Step 3.
NO Repair the damaged connector.
STEP 3. Wiring harness check between C-412 ETACS-ECU connector terminal No.15 and C-30 ASC OFF switch connector terminal No.1

- Check the power supply circuit for open circuit.

Q. Is the check result normal?

YES Go to Step 4.
NO Repair the wiring harness between C-412 ETACS-ECU connector terminal No.15 and C-30 ASC OFF switch connector terminal No.1.
STEP 4. Wiring harness check between C-30 ASC OFF switch connector terminal No.2 and the body ground

- Check the ground wires for open circuit.

Q. Is the check result normal?

YES Go to Step 5.
NO Repair the wiring harness between C-45 ASC OFF switch connector terminal No.2 and the body ground.
STEP 5. Retest the system.

Q. Does ASC turn ON and OFF normally using ASC OFF switch?

YES Intermittent malfunction How to Cope With Intermittent Malfunctions).
NO Replace the ETACS-ECU Electronic Time and Alarm Control System (ETACS)-ECU Removal and Installation).
Then go to Step 6.
STEP 6. Retest the system.

Q. Does ASC turn ON and OFF normally using ASC OFF switch?

YES The procedure is complete.
NO Return to Step 1.