DTC 11: Transponder Communication System Or Radio Interference Of Encrypted Code: Diagnosis

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 B (Vehicles without CAN communication system)

1. STEP 1. Check there is another key near the ignition key. 

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

   1. YES:  Move the other key well away from key being used.

      Confirm that diagnostic trouble code 11 is not output.

   2. NO:  Go to Step 2.
2. STEP 2. Check that the engine starts using the spare ignition key which encrypted code has been registered. 

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

   1. YES:  Replace the ignition key that does not work. Then register the password (secret code) and encrypted code ON-VEHICLE SERVICE . Confirm that diagnostic trouble code 11 is not output.
   2. NO:  Go to Step 3.
3. STEP 3. Recheck for diagnosis trouble code. 
   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 the "LOCK" (OFF) position.
   5. Disconnect scan tool MB991958.

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

   DTC 12 is output:  Refer to DTC 12 .

   DTC 11 is output:  Go to Step 4.

   Fig 1: Connecting Scan Tool MB991958 To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Check the ignition key ring antenna by backprobing. 
   1. Disconnect column switch connector C-88, and measure at the wiring device side.
      Fig 2: Locating Connector C-88

      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: Does the measured resistance value correspond with this range? 

   1. YES:  Go to Step 5.
   2. NO:  Replace the ignition key ring antenna. Confirm that diagnostic trouble code 11 is not output.
   Fig 3: Measuring Resistance Value Between Terminals 3 And 7

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5. STEP 5. Check immobilizer-ECU connector C-79 and ignition key ring antenna connector C-88 for damage. 

   Q: Are immobilizer-ECU connector C-79 and ignition key ring antenna connector C-88 in good condition? 

   1. YES:  Go to Step 6.
   2. NO:  Repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION . Confirm that diagnostic trouble code 11 is not output.
   Fig 4: Locating Connector C-79

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   Fig 5: Locating Connector C-88

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6. STEP 6. Check the wiring harness between immobilizer-ECU connector C-79 (terminal 10 and 11) and ignition key ring antenna connector C-88 (terminal 3 and 7). 

   Q: Are the wiring harness between immobilizer-ECU connector C-79 (terminal 10 and 11) and ignition key ring antenna connector C-88 (terminal 3 and 7) in good condition? 

   1. YES:  Replace the immobilizer-ECU. Then register the password (secret code) and encrypted code (Refer to ON-VEHICLE SERVICE .) Confirm that diagnostic trouble code 11 is not output.
   2. NO:  Repair the wiring harness. Confirm that diagnostic trouble code 11 is not output.
   Fig 6: Locating Connector C-79

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 7: Locating Connector C-88

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.