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ETACS CHASSIS ELECTRICAL 54A-313 PROBABLE CAUSES • Malfunction of the ETACS-ECU • Malfunction of the ignition switch <Vehicles with- out KOS> • Malfunction of the OSS-ECU <Vehicles with one touch start system> • Damaged harness wires and connectors DIAGNOSIS PROCEDURE STEP 1. Voltage measurement at ETACS-ECU wiring harness side. (2) Turn the ignition switch to the "ACC" position. connector (ACC terminal) and body earth. OK: System voltage Q: Is the check result normal? YES : Go to Step 5. NO <vehicles with one touch start system> : Go to Step 2. NO <vehicles without one touch start system> : Go to Step 3. STEP 2. Check the M.U.T.-III Diagnosis code for Q: Is the diagnosis code set? YES : Diagnose the OSS-ECU. Refer to GROUP 42B, Troubleshooting NO : Go to Step 4. STEP 3. Ignition switch check . Q: Is the check result normal? YES : Go to Step 4. NO : Troubleshoot the ignition switch. Refer to . STEP 4. Check of short to power supply, short to Q: Is the check result normal? YES : Go to Step 5. NO : Repair the connector(s) or wiring harness. STEP 5. M.U.T.-III data list • Item No. Item name Normal Item 288 ACC switch ON Turn the ignition switch to the ACC position. OK: Normal condition is displayed. Q: Is the check result normal? YES : The trouble can be an intermittent malfunction (Refer to GROUP 00 − How to use Troubleshooting/inspection Service − How to Cope with Intermittent Malfunction ). NO : Replace the ETACS-ECU. Inspection Procedure 2: The ignition switch (IG1) signal is not received. CAUTION • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the − How to Register Key ID COMMENTS ON TROUBLE SYMPTOM If there is an error to the input signal (IG1) from the PROBABLE CAUSES • Malfunction of the ETACS-ECU • Malfunction of the ignition switch <Vehicles with- out KOS> • Malfunction of the OSS-ECU <Vehicles with one touch start system> |