Inspection Procedure A-1: When the Ignition Switch is at the "LOCK" (OFF) Position, the Functions do not Work Normally. Check the Battery Power Supply Circuit to the ETACS-ECU.


caution Whenever the ECU is replaced, ensure that the power supply circuit and the earthing circuit are normal.


COMMENTS ON TROUBLE SYMPTOM




  • Lamp reminder function
  • Keyless entry system


  • Reading diagnosis code and checking input signal by M.U.T.-III.
  • Central door locking
  • Headlamp and tail lamp
  • Hazard warning lamp
  • Room lamps

PROBABLE CAUSES



  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list
Check the power supply voltage of the ETACS-ECU.

  • Turn the ignition switch to the "LOCK" (OFF) position
Item No.
 Item name
 Normal condition
55
 Battery voltage(battery)
 System voltage
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 4.
Go to Step 2.

STEP 2. Connector check: C-218 ETACS-ECU connector


Q. Is the check result normal?

Go to Step 3.

Repair the defective connector.

STEP 3. Check the wiring harness between C-218 ETACS-ECU connector terminal No.20 and fusible link (20).




note Prior to the wiring harness inspection, check junction block connector C-213, and repair if necessary.

  • Check the power supply line for open circuit.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

Repair the wiring harness.

STEP 4. Resistance measurement at the C-218 ETACS-ECU connector.


(1)Remove the ETACS-ECU, and measure at the junction block side.

(2)Continuity between C-218 ETACS-ECU connector terminal No.2 and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Go to Step 6.

Go to Step 5.

STEP 5. Check the wiring harness between C-218 ETACS-ECU connector terminal No.2 and body earth.



note Prior to the wiring harness inspection, check junction block connector C-208, and repair if necessary.

  • Check the earth wires for open circuit.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

Repair the wiring harness.

STEP 6. Retest the system.
Check that the battery power supply circuit to the ETACS-ECU is normal.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.