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.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. Check that the M.U.T.-III communicates with the engine-ECU or the engine-A-M/T-ECU <Automated manual transmission>.


Use the M.U.T.-III to confirm that it communicates with the engine-ECU or the engine-A-M/T-ECU. <Automated manual transmission>.

Q. Is the check result normal?

Go to Step 2.

Diagnose the MPI system. Refer to GROUP 13A, Troubleshooting <1100>, GROUP 13B, Troubleshooting <1300, except 1500-T/C> or GROUP 13C, Troubleshooting <1500-T/C>. And then go to Step 2.

STEP 2. M.U.T.-III CAN bus diagnostics


warning Since the radiator fan rotates during CAN bus line diagnostics, make sure that no one is servicing the engine compartment before diagnosing the CAN bus line. Since the CAN communication stops when diagnosing the CAN bus line, the ETACS-ECU detects the time-out of the engine-ECU, and activates the radiator fan to prevent overheating as fail-safe.
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to "Power supply circuit system check ".

Repair the CAN bus line (Refer to GROUP 54C, Troubleshooting ).