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.
      Fig 1: Connecting Scan Tool To Data Link Connector

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   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 DIAGNOSIS, CAN BUS DIAGNOSTIC CHART < vehicles without advanced air bag > or < vehicles with advanced air bag>). On completion, go to  Step 3.
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 DIAGNOSIS-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 malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS - HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
   2. NO  : Replace the combination meter and go to Step 1.