DTC 11

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

Part 1:

Part 2:

CIRCUIT OPERATION
The ignition key is powered by the ignition key ring antenna. The ignition key then sends an encrypted code. The ignition key ring antenna receives the encrypted code, and determines if the ignition key is registered.

DTC SET CONDITION
- DTC 11 may be output if other ignition keys are in the vicinity of the vehicle as it is being started.
- The transponder's encrypted code 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 MFI system DTC P0513.

TROUBLESHOOTING HINTS
- Radio interference of the encrypted code
- Malfunction of the transponder
- Malfunction of the immobilizer-ECU.
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (M.U.T-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827:M.U.T.-III USB Cable
- MB991911: M.U.T.-III Main Harness B

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?

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

NO: Go to Step 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?

YES: Replace the ignition key that does not work. Then register the password (secret code) and encrypted code, refer to Antitheft and Alarm Systems/Service and Repair/How To Register Encrypted Code. Retest the system.

NO: Go to Step 3.










STEP 3. Check immobilizer-ECU connector C-22, key reminder switch connector C-207 and ECM connector C-117 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are immobilizer-ECU connector C-22, key reminder switch connector C-207 and ECM connector C-117 in good condition?

YES : Go to Step 4.

NO : Repair or replace the damaged components). Refer to Harness Connector Inspection. Confirm that scan tool MB991958 communicates normally.







STEP 4. Check the harness wires between immobilizer-ECU connector C-22 (terminals 10 and 11) and key reminder switch connector C-207 (terminals 7 and 3).

Q: Are the harness wires between immobilizer-ECU connector C-22 (terminals 10 and 11) and key reminder switch connector C-207 (terminals 7 and 3) in good condition?

YES : Go to Step 5.

NO : Replace damaged components). Confirm that scan tool MB991958 communicates normally.







STEP 5. Check the harness wires between immobilizer-ECU connector C-22 (terminal 5) and ECM connector C-117 (terminal 98).

NOTE: Also check intermediate connector C-124 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-124 is damaged, Repair or replace the damaged components). Refer to Harness Connector Inspection.

Q: Are the harness wires between immobilizer-ECU connector C-22 (terminal 5) and ECM connector C-117 (terminal 98) in good condition?

YES : Go to Step 6.

NO : Replace damaged components). Confirm that scan tool MB991958 communicates normally.

STEP 6. 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?

DTC12 is output: Refer to DTC 12. DTC 12
DTC11 is output: Go to Step 7.

STEP 7. Replace the key ring antenna.
Replace the key ring antenna.

Q: Has the immobilizer system set the DTC?

YES : Replace the immobilizer-ECU. Then register the password (secret code) and encrypted code) and encrypted code. Retest the system.

NO : There is no action to be taken.