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DIAGNOSIS TSB Revision KEYLESS OPERATION SYSTEM (KOS) 42B-23 STEP 1. Using scan tool MB991958, diagnose the CAN bus CAUTION To prevent damage to scan tool (MB991958), always turn YES : Go to Step 2. ). STEP 2. Using scan tool MB991958, read the engine YES : Troubleshoot the MFI system (Refer to GROUP 13A, Diagnostic trouble code chart ). NO : Go to Step 3. STEP 3. Recheck for diagnostic trouble code. position. (2) Check if DTC is set. YES : Replace KOS-ECU and register the ID codes (Refer to ). After registering the ID codes, go to Step 4. NO : The trouble can be an intermittent malfunction (Refer to GROUP 00 − How to use Troubleshooting/inspection Service Points − How to Cope with Intermittent Malfunction AC608435 Data link connector MB991827 MB991824 MB991910 AB |