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
  • MB991911: Main Harness A

1. STEP 1. Using scan tool MB991958, read the diagnostic trouble code. 
   CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool.

   Use scan tool MB991958 to check if DTC 11 is set.

   • Connect scan tool MB991958 to the data link connector.
   • Turn the ignition switch "ON" position.
   • Read the immobilizer system diagnostic trouble code.

   Q: Does DTC11 reset? 

   1. YES  : Refer to DTC 11: TRANSPONDER COMMUNICATION SYSTEM OR RADIO INTERFERENCE OF ENCRYPTED CODE .
   2. NO  : Replace the ignition key that cannot be registered. Then re-register the encrypted code (Refer to HOW TO REGISTER ENCRYPTED CODE ). Verify that the ignition key can be registered, then Go to Step 2.
   Fig 1: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Retest the system. 

   Q: Does registered ignition key function properly? 

   1. YES  : The procedure is complete (If no malfunction are found in all steps, an intermittent malfunction is suspected. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
   2. NO  : Replace the immobilizer-ECU.