DTC 11: Transponder Communication System or Radio Interference of Encrypted Code: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB991502: Scan Tool

1. Check if 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. 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. SeeSPECIAL TOOLS  . Confirm that diagnostic trouble code 11 is not output.
   2. NO:  Go to Step 3.
3. Check which DTC is output, DTC11 or DTC12. 

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

   DTC12 is output:  See DTC 12: ENCRYPTED CODES ARE NOT THE SAME OR NOT REGISTERED  .

   DTC11 is output:  Go to Step 4.

4. Check the ignition key ring antenna by backprobing. 
   1. Disconnect column switch connector C-88, and measure at the wiring device side.
   2. Measure the resistance value between terminals No. 3 and 7 by backprobing.
      • The measured value should be 2 ohms or less.
        Fig 1: Identifying Column Switch Connector C-88 Terminals

        Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
        Fig 2: Checking Ignition Key Ring Antenna By Backprobing (DTC 11)

        Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

   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.
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. Confirm that diagnostic trouble code 11 is not output.
      Fig 3: Identifying Immobilizer-ECU Connector C-79 Location (DTC 11)

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 4: Identifying Ignition Key Ring Antenna Connector C-88 Location (DTC 11)

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. Check the wiring harness between immobilizer-ECU connector C-79 (terminals No. 10 and 11) and ignition key ring antenna connector C-88 (terminals No. 3 and 7). 

   Q: Are the wiring harness between immobilizer-ECU connector C-79 (terminals No. 10 and 11) and ignition key ring antenna connector C-88 (terminals No. 3 and 7) in good condition? 

   1. YES:  Replace the immobilizer-ECU. Then register the password (secret code) and encrypted code. SeeSPECIAL TOOLS  . 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 5: Identifying Immobilizer-ECU Connector C-79 Location (DTC 11)

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 6: Identifying Ignition Key Ring Antenna Connector C-88 Location (DTC 11)

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.