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⦆ External noise interference DIAGNOSIS Required Special Tools: ⦆ MB991958: Scan Tool (M.U.T.-III Sub Assembly) ⦆ MB991824: Vehicle Communication Interface (V.C.I.) ⦆ MB991827: M.U.T.-III USB Cable ⦆ MB991910: M.U.T.-III Main Harness A STEP 1. M.U.T.-III CAN bus diagnostics Q:Is the check result normal? YES: Go to Step 3. NO: Repair the CAN bus lines. (Refer to GROUP 54D - CAN Bus Diagnostics table P.54D-17.) On completion, go to STEP 2. Diagnostic trouble code recheck after resetting Q:Is DTC C121C set? YES: Go to Step 3. NO: The procedure is complete. STEP 3. M.U.T.-III other system diagnostic trouble code Q:Is any DTC set? YES: Troubleshoot the engine ECU diagnostic trouble code. (Refer to GROUP 13Ab - Diagnostic trouble code NO: Go to Step 4. STEP 4. Check whether the diagnostic trouble code is reset. Q:Is DTC C121C set? YES: Replace the ASC-ECU. Then go to Step 5. NO: If the trouble symptom is resolved, an intermittent malfunction such as poorly engaged connector(s) or wiring STEP 5. M.U.T.-III diagnostic trouble code Q:Is DTC U1417 set? YES: Troubleshoot for the diagnostic trouble code U1417. NO: The procedure is complete. ACTIVE SKID CONTROL SYSTEM (ASC) 35C-127 DIAGNOSIS |