INSPECTION PROCEDURE 6: Speedometer does not Work.; INSPECTION PROCEDURE 7: The Fuel Gauge Needle Moves Excessively: 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 (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? 

   YES:  Go to Step 2.

   NO:  Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTIC CHART ). On completion, go to Step  5.

   Fig 1: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Using scan tool MB991958, read A/T diagnostic trouble code. 

   Check if an A/T system DTC is set.

   Q: Is the DTC set? 

   YES:  Refer to DIAGNOSTIC TROUBLE CODE CHART . On completion, go to Step  5.

   NO:  Go to Step 3.

3. STEP 3. Using scan tool MB991958, check data list. 
   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 to the data link connector.
   2. Turn the ignition switch to the "ON" position.
   3. Set scan tool MB991958 to the data reading mode.
      • Item 80: Speedometer
        • The voltage should equal battery positive voltage.
      • Item 81: Speedometer (Target)
        • The voltage should equal battery positive voltage.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the measured voltage equal battery positive voltage? 

   YES:  It can be assumed that this malfunction is intermittent. Refer to "How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS " .

   NO:  Go to Step 4.

   Fig 2: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Check the speedometer 

   Use scan tool MB991958 to enter simulated vehicle speed.

   1. Connect scan tool MB991958 to the data link connector.
   2. Turn the ignition switch to "ON" position.
   3. Select "Interactive Diagnosis" from the start-up screen.
   4. Select "System Select."
   5. Choose "Meter" from the "BODY" tab.
   6. Select "Simulated vehicle Speed Output."

      OK: The speedometer shows that simulated vehicle speed. 

   Q: Is the check result satisfactory? 

   YES:  Go to Step 5.

   NO:  Replace the combination meter, then go to Step 5.

5. STEP 5. Retest the system. 

   Check that the speedometer works normally.

   Q: Is the check result satisfactory? 

   YES:  The procedure is complete. (If no 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 MALFUNCTIONS " ).

   NO:  Replace the combination meter.