Inspection Procedure 1: Communication between the M.U.T.-III and the SRS-ECU is not possible.


COMMENTS ON TROUBLE SYMPTOM


If the M.U.T.-III cannot communicate with the SRS system, the CAN bus lines may be defective. If the SRS system does not work, the SRS-ECU or its power supply circuit may be defective.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. 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?
Check and repair the power supply circuit system (Refer to ).
Repair the CAN bus lines (Refer to GROUP 54C, Troubleshooting - Can Bus Diagnosis Table ).