ENGINE IMMOBILISER SYSTEM (w/ Smart Entry and Start System) Immobiliser System does not Operate Properly

DESCRIPTION


WIRING DIAGRAM

Click here

INSPECTION PROCEDURE

Note


  • When using the GTS with the vehicle 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 the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry(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 engine immobiliser system uses the LIN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the engine immobiliser system after confirming that the communication systems are functioning properly Click here.

  • Before replacing the ID code box (immobiliser code ECU), refer to Service Bulletin.

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

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs Click here.

      Result:
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    Go to DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  2. READ VALUE USING GTS (IMMOBILISER FUEL CUT)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List.

    5. Read the Data List according to the display on the GTS.

      Engine and ECT (ECM)
      Tester Display Measurement Item Normal Condition Reference Value Diagnostic Note
      Immobiliser Fuel Cut Immobiliser fuel cut status ON or OFF

      ON: Immobiliser fuel cut on

      OFF: Immobiliser fuel cut off

      		 -
      OK
      The item in the Data List indicates "OFF".

    NG

    CHECK WHETHER ENGINE STARTS Click here

    OK

    Go to ECD SYSTEM Click here

  3. CHECK WHETHER ENGINE STARTS


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

      OK
      Engine starts normally.

    NG

    REGISTER ECU COMMUNICATION ID Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  4. REGISTER ECU COMMUNICATION ID


    1. Reregister the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.


    NEXT

  5. CHECK WHETHER ENGINE STARTS


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

      OK
      Engine starts normally.

    NG

    REPLACE ECM Click here

    OK

    END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

  6. REPLACE ECM


    1. Temporarily replace the ECM with a new or known good one Click here.


    NEXT

  7. CHECK WHETHER ENGINE STARTS


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

      OK
      Engine starts normally.

    NG

    CHECK HARNESS AND CONNECTOR (ID CODE BOX [IMMOBILISER CODE ECU] - ECM) Click here

    OK

    END (ECM WAS DEFECTIVE)

  8. CHECK HARNESS AND CONNECTOR (ID CODE BOX [IMMOBILISER CODE ECU] - ECM)


    1. Disconnect the H81 ID code box (immobiliser code ECU) connector.

    2. Disconnect the B72 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H81-3 (EFII) - B72-15 (IMO) Always Below 1 Ω
      H81-3 (EFII) - Body ground Always 10 kΩ or higher
      B72-15 (IMO) - Body ground Always 10 kΩ or higher
      H81-4 (EFIO) - B72-16 (IMI) Always Below 1 Ω
      H81-4 (EFIO) - Body ground Always 10 kΩ or higher
      B72-16 (IMI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. 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.


    NEXT

  10. REGISTER RECOGNITION CODES


    1. Register the recognition codes in the ECUs.

      Tech Tips

      Refer to Service Bulletin.


    NEXT

  11. REGISTER ECU COMMUNICATION ID


    1. Reregister the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.


    NEXT

  12. CHECK WHETHER ENGINE STARTS


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

      OK
      Engine starts normally.

    NG

    Go to ECD SYSTEM Click here

    OK

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