Diagnosis Procedure

Required Special Tools: 

• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
  • MB991824: Vehicles Communication Interface (V.C.I.)
  • MB991827: MUT-III USB Cable
  • MB991910: Main Harness A

1. STEP 1. Check for presence of other key near the key in the ignition. 

   Q: Is there any other key near the key in the ignition? 

   1. YES  : Move the other key well away from key being used. Retest the system.
   2. NO  : Go to Step 2.
2. STEP 2. Check that the engine start using the spare ignition key which encrypted code has been registered. 

   Q: Does the engine start using the spare ignition key for which the encrypted code has been registered? 

   1. YES  : Replace the ignition key that does not work. Then register the password (secret code) and encrypted code HOW TO REGISTER ENCRYPTED CODE . Retest the system.
   2. NO  : Go to Step 3.
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 to the data link connector.
   2. Turn the ignition switch to the "ON" position.
   3. Use scan tool MB991958 to check immobilizer system diagnostic trouble codes.
   4. Turn the ignition switch to "LOCK" (OFF) position.
   5. Disconnect scan tool MB991958.

   Q: Which DTC is output, DTC 11 or 12? 

   1. DTC 12 is output:  Refer to DTC 12: ENCRYPTED CODES ARE NOT THE SAME OR ARE NOT REGISTERED .
   2. DTC 11 is output:  Go to Step 4.
   Fig 1: Connecting Scan Tool To Data Link Connector

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4. STEP 4. Check the ignition key ring antenna by backprobing. 
   1. Disconnect the key reminder switch connector C-304.
      Fig 2: Disconnecting Key Reminder Switch Connector C-304

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   2. Measure the resistance value between terminal number 3 and terminal number 7 by backprobing.
      • The measured value should be 2 ohm or less.

   Q: Is the check result normal? 

   1. YES  : Go to Step 5.
   2. NO  : Replace the ignition key ring antenna. Retest the system.
   Fig 3: Measuring Resistance Value Between Terminal Number 3 And Terminal Number 7

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5. STEP 5. Check Immobilizer-ECU connector C-113 and key reminder switch connector C-304 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Are immobilizer-ECU connector C-113 and key reminder switch connector C-304 in good condition? 

   1. YES  : Go to Step 6.
   2. NO  : Repair or replace the damage component(s). Confirm that scan tool MB991958 communicates normally.
   Fig 4: Identifying Immobilizer-ECU Connector C-113

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   Fig 5: Identifying Key Reminder Switch Connector C-304

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6. STEP 6. Check the harness wires between immobilizer-ECU connector C-113 (terminal 7 and 8) and key reminder switch connector C-304 (terminal 3 and 7). 

   Q: Are the harness wires between immobilizer-ECU connector C-113 (terminal 7 and 8) and key reminder switch connector C-304 (terminal 3 and 7) in good condition? 

   1. YES  : Replace the immobilizer-ECU and then register the password (secret code) and encrypted code (Refer to HOW TO REGISTER ENCRYPTED CODE ). Retest the system.
   2. NO  : Repair or replace the damaged component(s). Confirm that scan tool MB991958 communicates normally.
   Fig 6: Identifying Key Reminder Switch Connector C-304

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 7: Identifying Immobilizer-ECU Connector C-113

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.