DTC 11

Ignition Key Ring Antenna Circuit:

CIRCUIT OPERATION
The ignition key is powered by the ignition key ring antenna, and sends an encrypted code. The ignition key ring antenna receives the encrypted code, and determines whether is the ignition key is a registered key or not.

DTC SET CONDITION
- If the engine is started while several ignition keys are in the vicinity, then interference between the different keys may occur, which will cause this code to be generated.
- The encrypted code of the transponder is not sent to the immobilizer-ECU immediately after the ignition switch is turned to "ON" position.

NOTE: DTC 11 is always output together with NFI system DTC P1610.

TROUBLESHOOTING HINTS
- Radio interference of encrypted code
- malfunction of transponder
- malfunction of key reminder switch (ignition key ring antenna)
- malfunction of immobilizer-ECU
- Damaged wiring harness of connectors

DIAGNOSIS
Required Special Tools:
MB991223: Harness Set
MB991502: Scan Tool (MUT-II)

STEP 1. Is there any other key close to that key?
If yes, move the other key well away from key being used.
Confirm that diagnostic trouble code 11 is not output.

If no, go to Step 2.

STEP 2. Does the engine start using the spare ignition key which encrypted code has been registered?
If yes, replace the ignition key that does not work. Then register the password (secret code) and encrypted code.

Confirm that diagnostic trouble code 11 is not output.

If no, go to Step 3.

STEP 3. Re-check the DTC.
If DTC 12 output.

If DTC 11 output, go to Step 4.




STEP 4. Check the ignition key ring antenna.
Disconnect the key reminder switch (ignition key ring antenna) connector C-88 and check the continuity between terminal number 3 and
terminal number 7.

If the ignition key ring antenna is faulty, replace it. Confirm that diagnostic trouble code ii is not output.

If the ignition key ring antenna is in good condition, go to Step 5.







STEP 5. Check immobilizer-ECU connector C-107 and key reminder switch (ignition key ring antenna) connector D-28 for damage.
If immobilizer-ECU connector C-107 and key reminder switch (ignition key ring antenna) connector D-28 are damaged, repair or replace them. Refer to Harness Connector Inspection.

Confirm that diagnostic trouble code 11 is not output. If these connectors are in good condition, go to Step 6.







STEP 6. Check the harness wires between immobilizer-ECU connector C-107 and key reminder switch (ignition key ring antenna) connector D-28.
If the harness wires between immobilizer-ECU connector C-107, and key reminder switch (ignition key ring antenna) connector D-28 are damaged, repair them.

Confirm that diagnostic trouble code 11 is not output.

If the harness wires are in good condition, replace the immobilizer-ECU. Then register the password (secret code) and encrypted code.

Confirm that diagnostic trouble code 11 is not output.