Inspction Procedure 1: Cannot communicate with KOS-ECU using the M.U.T.-III












PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. V.C.I. status check
Check that the V.C.I. indicator lamp is illuminated in green.

Q. Is it illuminated in green?
Diagnose the CAN bus lines, and repair it if necessary (Refer to GROUP 54C - Troubleshooting ).
Go to Step 2.

STEP 2. Connector check: C-317 ETACS-ECU connector, C-127 diagnosis connector

Q. Is the check result normal?
Go to Step 3.
Repair the defective connector.

STEP 3. Wiring harness check between the C-317 ETACS-ECU connector No. 8 and the C-127 diagnosis connector terminal No. 16

  • Check the power supply line for open circuit.

Q. Is the check result normal?
Go to Step 4.
Repair the wiring harness.

STEP 4. Wiring harness check between the C-127 diagnosis connector terminal No. 4, 5 and the earth.

  • Check the earth wires for open circuit.

Q. Is the check result normal?
Check M.U.T.-III (Refer to M.U.T.-III User’s Manual).
Repair the wiring harness.