INSPECTION PROCEDURE 1: Communication With Scan Tool is Not Possible.: Diagnosis

Required Special Tools: 

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

1. STEP 1. Check that the powertrain control module communicates with the scan tool. 
   1. Connect scan tool MB991958 to the data link connector.
   2. Turn the ignition switch to "ON" position.
   3. Check if scan tool MB991958 can communicate with the powertrain control module.

   Q: Is the check result satisfactory? 

   1. YES:  Go to Step 2.
   2. NO:  Refer to DIAGNOSTIC TROUBLE CODE CHART or DIAGNOSTIC TROUBLE CODE CHART .
      Fig 1: Connecting Scan Tool MB991958 To Data Link Connector

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Using scan tool MB991958, diagnose the CAN bus line 

   Use scan tool MB991958 to diagnose the CAN bus lines.

   Q: Is the check result satisfactory? 

   1. YES:  Diagnose the power supply circuit. Refer to DIAGNOSIS .
   2. NO:  Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTIC CHART ).