Inspection Procedure 1: The Scan Tool Cannot Communicate With The ABS/ASC System: 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

Using scan tool MB991958, diagnose the CAN bus lines. 

Using the scan tool, diagnose the CAN bus lines.

Q: Is the check result normal? 

1. YES:  Check and repair the power supply circuit system. (Refer to INSPECTION PROCEDURE 11: ASC-ECU POWER SUPPLY CIRCUIT SYSTEM  .)
2. NO:  Repair the CAN bus lines. (Refer to TROUBLESHOOTING .)