INSPECTION PROCEDURE 8: Tachometer does not Work.: 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. Using scan tool MB991958, diagnose the CAN bus line. 
   1. Connect scan tool MB991958 to the data link connector.
   2. Turn the ignition switch to "ON" position.
   3. Diagnose the CAN bus line.

   Q: Is the check result satisfactory? 

   1. YES:  Go to Step 2.
   2. NO:  Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTIC CHART ). On completion, go to  Step 3.
      Fig 1: Connecting Scan Tool MB991958 To Data Link Connector

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Using scan tool MB991958, read MFI system diagnostic trouble code. 

   Check if the MFI system DTC is set.

   Q: Is the DTC set? 

   1. YES:  Diagnose the MFI system (Refer to DIAGNOSTIC TROUBLE CODE CHART or DIAGNOSTIC TROUBLE CODE CHART ). On completion, go to Step 3.
   2. NO:  Go to Step 3.
3. STEP 3. Retest the system. 

   Check that the tachometer works normally.

   Q: Is the check result satisfactory? 

   1. YES:  The procedure is complete. (If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).
   2. NO:  Replace the combination meter.