INSPECTION PROCEDURE 1: Communication with the M.U.T.-III is not possible.


COMMENTS ON TROUBLE SYMPTOM
If the system does not communicate with the M.U.T.-III, power supply to the diagnosis connector or CAN bus lines may be defective.

POSSIBLE CAUSES

  • Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Check that the engine-ECU <M/T> or the engine-A/T-ECU <A/T> communicates with the M.U.T.-III.
Check that the M.U.T.-III communicates with the engine-ECU <M/T> or the engine-A/T-ECU when the M.U.T.-III is operated..

Q. Is the check result satisfactory?
Go to Step 2.
Perform MPI system troubleshooting. (Refer to GROUP 13A, Troubleshooting or GROUP 13B, Troubleshooting .)

Step 2. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result satisfactory?
Diagnose the power supply circuit. Refer to .
Repair the CAN bus lines (Refer to GROUP 54F, Diagnosis - Can Bus Diagnostics Table ).