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.

    Click here

  • Before replacing the ECM or ID code box (immobiliser code ECU), 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 SFI system DTC.

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs.


      Body Electrical > Entry&Start > Trouble Codes
      Powertrain > Engine > Trouble Codes
      OK
      DTCs are not output.
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are 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 / Data List.

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


      Powertrain > Engine > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Immobiliser Fuel Cut Status of immobiliser fuel cut ON or OFF - -

      Powertrain > Engine > Data List
      Tester Display
      Immobiliser Fuel Cut
      Result
      Result Proceed to
      "ON" is displayed on the Data List screen of the GTS (w/ Canister Pump Module) A
      "ON" is displayed on the Data List screen of the GTS (w/o Canister Pump Module) B
      "OFF" is displayed on the Data List screen of the GTS C

    A

    GO TO SFI SYSTEM Click here

    B

    GO TO SFI SYSTEM Click here

    C

  3. 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

  4. INSPECT ECM (TERMINAL IMI AND IMO)


    1. Using an oscilloscope, check the waveform.

      B002EWGC01
      *a

      Component with harness connected

      (ECM)

      		 *b Approximately 160 ms
      *c Approximately 270 ms *d Approximately 40 ms
      *e Approximately 60 ms *f Waveform (IMO)
      *g Waveform (IMI) *h Waveform A
      *i Waveform B *j Waveform C
      *k Waveform A (detail) - -

      Tech Tips

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      Measurement Condition
      Item Content
      Tester Connection

      A12-9 (IMO) - Body ground

      A12-8 (IMI) - Body ground
      Tool Setting 2 V/DIV., 500 ms./DIV.
      Condition Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected
      Result
      Result Proceed to
      Normal waveform A
      Waveform A not output, or has abnormal wavelength or shape B
      Waveform B not output, or has abnormal wavelength or shape C
      Waveform C not output, or has abnormal wavelength or shape D

    B

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

    C

    REPLACE ECM Click here

    D

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU) Click here

    A

  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

    GO TO STEP 8 Click here

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


    1. Disconnect the K60 ID code box (immobiliser code ECU) connector.

    2. Disconnect the A12 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K60-3 (EFII) - A12-9 (IMO) Always Below 1 Ω
      K60-4 (EFIO) - A12-8 (IMI) Always Below 1 Ω
      K60-3 (EFII) or A12-9 (IMO) - Body ground Always 10 kΩ or higher
      K60-4 (EFIO) or A12-8 (IMI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. 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

  9. REGISTER RECOGNITION CODE


    1. Register the recognition codes in the ECUs.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  10. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  11. CHECK WHETHER ENGINE STARTS


    1. Check that the engine starts.

      OK
      Engine starts normally.
      Result
      Result Proceed to
      OK A
      NG (w/ Canister Pump Module) B
      NG (w/o Canister Pump Module) C

    A

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

    B

    GO TO SFI SYSTEM Click here

    C

    GO TO SFI SYSTEM Click here