Diagnostic Procedure

Required Special Tools: 

• MB992006: Extra fine probe
• MB991223: Harness set
• 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

1. STEP 1. Check the power supply system. 

   With the ignition switch in the LOCK (OFF) position, check if the following function operates normally:

   • Hazard warning light
   • Central door locking system

     Q: Is the check result normal? 

     • YES:  Go to Step 2.
     • NO:  Refer to MALFUNCTION OF ETACS-ECU POWER SUPPLY CIRCUIT .
2. STEP 2. Using scan tool MB991958, read CAN bus the diagnostic trouble code. 
   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 SCAN TOOL (M.U.T.-III) ."
   2. Turn the ignition switch to the "ON" position.
   3. Check whether the CAN bus lines related DTC is set.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

      Q: Is the DTC set? 

      • YES:  Repair the CAN bus line (Refer to CAN BUS DIAGNOSTICS TABLE ).
      • NO:  Go to Step 3.
        Fig 1: Connecting Scan Tool To Data Link Connector

        Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Using scan tool MB991958, read the diagnostic trouble code. 
   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 SCAN TOOL (M.U.T.-III) ."
   2. Turn the ignition switch to the "ON" position.
   3. Check whether the ETACS-ECU related DTC is set.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

      Q: Is the DTC set? 

      • YES:  Diagnose the ETACS-ECU. Refer to DIAGNOSTIC TROUBLE CODE CHART .
      • NO:  Go to Step 4.
        Fig 2: Connecting Scan Tool To Data Link Connector

        Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Using scan tool MB991958, check data list. 

   Check the signals related to the sunroof timer function operation.

   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 the "ON" position.
   3. Check the data list of the ETACS.
      • Turn the ignition switch to the LOCK (OFF) position.
      • Close the driver's door.
      • Close the passenger's door.
        ITEM REFERENCE
        
        

        Item No.	Item name	Normal condition
        254	IG voltage	Battery positive voltage
        256	Dr door ajar switch	Close
        257	As door ajar switch	Close

   4. Turn the ignition switch to the "LOCK" (OFF) position.

      OK: Normal conditions are displayed for all the items. 

      Fig 3: Connecting Scan Tool To Data Link Connector

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

      Q: Are the check results normal? 

      • YES <Normal conditions are displayed for all the items.>:  Go to Step 5.
      • NO <Normal condition is not displayed for item No. 254.>:  Refer to INSPECTION PROCEDURE 2: THE IGNITION SWITCH (IG1) SIGNAL IS NOT RECEIVED .
      • NO <Normal condition is not displayed for item No. 256.>:  Refer to INSPECTION PROCEDURE 5: THE FRONT DOOR SWITCH (DRIVER'S SIDE) SIGNAL IS NOT RECEIVED. .
      • NO <Normal condition is not displayed for item No. 257.>:  Refer to INSPECTION PROCEDURE 6: THE FRONT DOOR SWITCH (PASSENGER'S SIDE) SIGNAL IS NOT RECEIVED. .
5. STEP 5. Retest the system. 

   Check that the sunroof timer function works normally.

   Q: Is the check result normal? 

   • YES:  No action is necessary and testing is complete.
   • NO:  Replace the ETACS-ECU. Check that the sunroof timer function works normally.