Inspection Procedure 1: Scan tool communication with ABS/ASC system is impossible: 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

Scan tool CAN bus diagnosis 

Use scan tool to diagnose the CAN bus lines.

Q: Is the check result normal? 

1. YES:  Check the power supply circuit, and repair if necessary (Refer to INSPECTION PROCEDURE 12: ASC-ECU POWER SUPPLY CIRCUIT SYSTEM  ).
2. NO:  Repair the CAN bus lines (Refer to CAN BUS DIAGNOSIS TABLE ).