Diagnostic Procedure

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: V.C.I.
  • MB991827: M.U.T.-III USB Cable
  • MB991910: M.U.T.-III Main Harness A

1. STEP 1. Scan tool (M.U.T.-III) CAN bus diagnostics 

   Use scan tool MB991958 (M.U.T.-III), diagnose the CAN bus lines.

   Q: Is the CAN bus normal? 

   YES  : Go to  Step 2.

   NO  : Repair the CAN bus line (refer to CAN BUS DIAGNOSTICS CHART ).

2. STEP 2. 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 ETACS-ECU .

   NO  : Go to  Step 3.

   Fig 1: Connecting Special Tool MB991910 To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Check the power supply system 

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

   • Headlight
   • Hazard warning light

   Q: Is the check result normal? 

   YES  : Go to  Step 4.

   NO  : Refer to MALFUNCTION OF ETACS-ECU POWER SUPPLY CIRCUIT .

4. STEP 4. Verify the central door locking system. 

   Q: Does the central door locking system work normally? 

   YES  : Go to  Step 5.

   NO  : Refer to TROUBLESHOOTING STRATEGY .

5. STEP 5. Using scan tool MB991958, check data list. 

   Check the signals related to the keyless entry system 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 ETACS data list.
      • Turn the ignition switch to the LOCK (OFF) position.
      • Close the driver's door.
      • Close the passenger's door.
      • Close the RH-side rear door.
      • Close the LH-side rear door.
      • Close the liftgate.
      • Remove the ignition key from the ignition key cylinder.
      ITEM NAME AND NORMAL CONDITIONS REFERENCE
      
      

      Item No.	Item name	Normal condition
      Item 254	IG voltage	Battery voltage
      Item 256	Dr door ajar switch	Close
      Item 257	As door ajar switch	Close
      Item 258	RR door ajar switch	Close
      Item 259	RL door ajar switch	Close
      Item 260	Trunk/gate trunk ajar switch	Close
      Item 264	Handle lock switch	Key in → Key out

      Fig 2: Connecting Special Tool MB991910 To Data Link Connector

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   OK: Normal condition is displayed. 

   Q: Is the check result normal? 

   YES (Normal conditions are displayed for all the items):  Go to  Step 6.

   NO (Normal condition is not displayed for item No. 254)  : Refer to INSPECTION PROCEDURE 2: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE IGNITION SWITCH (IG1) .

   NO (Normal condition is not displayed for item No. 256)  : Refer to INSPECTION PROCEDURE 5: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE FRONT DOOR SWITCH (LH) .

   NO (Normal condition is not displayed for item No. 257)  : Refer to INSPECTION PROCEDURE 6: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE FRONT DOOR SWITCH (RH) .

   NO (Normal condition is not displayed for item No. 258)  : Refer to INSPECTION PROCEDURE 8: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE REAR DOOR SWITCH (RH) .

   NO (Normal condition is not displayed for item No. 259)  : Refer to INSPECTION PROCEDURE 7: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE REAR DOOR SWITCH (LH) .

   NO (Normal condition is not displayed for item No. 260)  : Refer to INSPECTION PROCEDURE 9: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE LIFTGATE SWITCH .

   NO (Normal condition is not displayed for item No. 264)  : Refer to INSPECTION PROCEDURE 3: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE KEY REMINDER SWITCH. .

6. STEP 6. Using scan tool MB991958, check pulse check. 

   Check the signals related to the keyless entry system 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. Confirm the ETACS pulse check.
      • Remove the ignition key from the ignition key cylinder.
   ITEM NAME AND CONDITIONS REFERENCE
   
   

   Item name	Conditions
   Transmitter switch	Turn the switch ON/OFF.

   OK: The scan tool (M.U.T.-III) tone alarm sounds. 

   Q: Is the check result normal? 

   YES  : Go to  Step 7.

   NO  : Refer to INSPECTION PROCEDURE 7: THE TIMER LOCK FUNCTION DOES NOT WORK AFTER THE DOORS HAVE BEEN UNLOCKED BY THE KEYLESS ENTRY SYSTEM. .

   Fig 3: Connecting Special Tool MB991910 To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
7. STEP 7. Retest the system. 

   Check if the keyless entry system works normally.

   Q: Is the check result normal? 

   YES  : Intermittent malfunction (refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).

   NO  : Replace WCM and register the ID codes (refer to ID CODES REGISTRATION PROCEDURE ).