Inspection Procedure 3: Abnormality in KOS-ECU power supply and earth circuits.


caution Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.










PROBABLE CAUSES



  • Damaged wiring harness and connectors
  • Malfunction of KOS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-23 KOS-ECU connector, C-317 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 2.
Repair the defective connector.

STEP 2. Check the wiring harness between the C-23 KOS-ECU connector terminal No. 38, 39 and the C-317 ETACS-ECU connector terminal No. 10, 5 and between the C-23 KOS-ECU connector terminal No. 14 and the body earth.

  • Check the power supply line for open and short circuit, and check the earth line for open circuit.

Q. Is the check result normal?
Go to Step 3.
Repair the wiring harness.

STEP 3. Retest the system

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace KOS-ECU and register the ID codes (Refer to ).