DTC U0019: Bus off (CAN-B): Diagnosis

Required Special Tools: 

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: Vehicles Communication Interface (V.C.I.)
  • MB991827: M.U.T.-III USB Cable
  • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line. 

   Use scan tool MB991958 to diagnose the CAN bus lines.

   CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
   1. Connect scan tool MB991958. Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)  ."
   2. Turn the ignition switch to "ON" position.
   3. Diagnose the CAN bus line.

      Q: Is the check result normal? 

      • YES:  Go to Step 2.
      • NO:  Repair the CAN bus line. (Refer to DIAGNOSIS .) On completion, go to Step 2.
        Fig 1: Connecting Special Tool To Data Link Connector

        Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Check whether the scan tool MB991958 can communicate with the satellite radio tuner. 

   Q: Is the check result normal? 

   • YES:  Erase the diagnosis code. The procedure is complete.
   • NO:  Check the power supply circuit of the satellite radio tuner, and repair if necessary.