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DIAGNOSIS TSB Revision ACTIVE STABILITY CONTROL SYSTEM (ASC) 35C-93 DTC SET CONDITIONS ASC-ECU monitors the signals from each wheel speed sensor . PROBABLE CAUSES • Wheel bearing malfunction detection • Adhesion of foreign materials on the magnetic encoder for wheel speed detection • ABS-ECU malfunction for wheel speed detection • Missing teeth of the magnetic encoder for wheel speed detection DIAGNOSIS Required Special Tools: • MB991958 Scan Tool (M.U.T.-III Sub Assembly) • MB991824: Vehicle Communication Interface (V.C.I.) • MB991997: ASC check harness STEP 1. Using scan tool MB991958, diagnose the CAN bus YES : Go to Step 3. Troubleshooting .) After repairing the CAN bus line, go to Step 2. STEP 2. DTC recheck after repairing the CAN bus line YES : Go to Step 3. STEP 3. Wheel bearing looseness check − On-vehicle Service .) Q: Is the check result normal? YES : Go to Step 4. GROUP 27 − Rear Axle Hub Assembly |