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PROBABLE CAUSES ⦆ Malfunction of ETACS-ECU ⦆ Engine ECU malfunction ⦆ ETACS-ECUs have been interchanged between two vehicles. ⦆ ASC-ECU malfunction ⦆ ASC-ECUs have been interchanged between two vehicles. 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 U1417 set? YES: Go to Step 3. NO: The procedure is complete. STEP 3. M.U.T.-III diagnostic trouble code Q:Is DTC C121C set? YES: Troubleshoot for the relevant diagnostic trouble code. NO: Go to Step 4. STEP 4. M.U.T.-III other system diagnostic trouble code Q:Is any DTC set? YES: Troubleshoot for the relevant diagnostic trouble code. NO: Go to Step 5. STEP 5. Check part number of ETACS-ECU OK: 8637A213 Q:Is the check result normal? YES: Go to Step 6. NO: Replace ETACS-ECU. ACTIVE SKID CONTROL SYSTEM (ASC) 35C-159 DIAGNOSIS |