CAUTIONCOMMENTS ON TROUBLE SYMPTOM
If the front-ECU has sent abnormal signal to the ETACS-ECU for consecutively 15 communication
cycles (0.6 second), the diagnosis code will be set. If the front-ECU has sent normal signal
to the ETACS-ECU for consecutively 15 communication cycles (0.6 second), the ETACS-ECU will
stop sending the diagnosis code.POSSIBLE CAUSES
- Malfunction of the front-ECU
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
Step 4. Check the wiring harness between A-11X front-ECU connector
terminal No.5 and the fusible link (1).
NOTE: Prior to the wiring harness inspection, check junction block connectors C-202, C-204 and
intermediate connectors A-14, C-116 and C-125, and repair if necessary.
- Check the power supply line for open circuit.
Q: Is the check result normal?
YES:
The trouble can be an intermittent malfunction (Refer to GROUP 00 -
How
to Cope with Intermittent Malfunction 
).NO: Repair the wiring harness.
Step 7. Check the wiring harness between A-12X front-ECU connector
terminal No.21 and the body earth.
- Check the earth wires for open circuit.
Q: Is the check result normal?
YES:
The trouble can be an intermittent malfunction (Refer to GROUP 00 -
How
to Cope with Intermittent Malfunction ).NO: Repair the wiring harness.
Step 9. Check the wiring harness between C-219 ETACS-ECU connector
terminal No.59 and A-12X front-ECU connector terminal No.30.
NOTE: Prior to the wiring harness inspection, check joint connector C-02 and intermediate connector
C-116, and repair if necessary.
- Check the communication lines for open circuit.
Q: Is the check result normal?
YES:
Go to Step 10
.NO: Repair the wiring harness.
Step 10. Check whether the diagnosis code is reset.
- Replace the column switch.
- Ignition switch: ON
- On completion, check that diagnosis code No.13 is not reset.
Q: Is diagnosis code No.13 set?
YES:
Replace the ETACS-ECU.NO: The procedure is complete.