IMMOBILISER SYSTEM Immobiliser System does not Operate Properly

DESCRIPTION

The immobiliser system compares the ID code that is registered in the certification ECU (smart key ECU assembly) with the ID code of the transponder chip that is embedded in the electrical key transmitter sub-assembly.

WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • The immobiliser system uses the LIN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the immobiliser system after confirming that the communication systems are functioning properly.

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  • Before replacing the ECM, ID code box (immobiliser code ECU) or certification ECU (smart key ECU assembly), refer to Service Bulletin.

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation."

Tech Tips

If an immobiliser system or SFI system DTC is output, first perform troubleshooting for the immobiliser system or engine DTC.

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs.


      Body Electrical > Entry&Start > Trouble Codes
      Powertrain > Engine > Trouble Codes
      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  2. CHECK WHETHER ENGINE STARTS


    1. Check that the engine starts 5 seconds after the engine switch turned on (IG).

      OK
      Engine starts normally.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. SYSTEM CHECK


    1. Check the vehicle specification.

      Result
      Result Proceed to
      w/o Blocking System A
      w/ Blocking System B

    B

    GO TO BLOCKING SYSTEM (Proceed to Engine does not Start) Click here

    A

  4. CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - ECM)


    1. Disconnect the I26 ID code box (immobiliser code ECU) connector.

    2. Disconnect the A35 ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I26-3 (EFII) - A35-45 (IMO) Always Below 1 Ω
      I26-4 (EFIO) - A35-28 (IMI) Always Below 1 Ω
      I26-3 (EFII) or A35-45 (IMO) - Body ground Always 10 kΩ or higher
      I26-4 (EFIO) or A35-28 (IMI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK WHETHER ENGINE STARTS


    1. Check that the engine starts.

      OK
      Engine starts normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

    NG

  7. REPLACE ID CODE BOX (IMMOBILISER CODE ECU)


    1. Replace the ID code box (immobiliser code ECU) with a new one.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  8. REGISTER RECOGNITION CODE


    1. Register the recognition codes in the ECUs.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  9. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK WHETHER ENGINE STARTS


    1. Check that the engine starts.

      OK
      Engine starts normally.
      Result
      Proceed to
      OK
      NG (8AR-FTS (w/ Canister Pump Module))
      NG (8AR-FTS (w/o Canister Pump Module))
      NG (3ZR-FAE)

    OK

    END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE)

    NG (8AR-FTS (w/ Canister Pump Module))

    GO TO SFI SYSTEM Click here

    NG (8AR-FTS (w/o Canister Pump Module))

    GO TO SFI SYSTEM Click here

    NG (3ZR-FAE)

    GO TO SFI SYSTEM Click here