IMMOBILISER SYSTEM(w/ Smart Entry and Start 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.

The system unsets if these ID codes match. Thus, the certification ECU (smart key ECU assembly) and the ECM communicate with each other enabling the engine to start.

WIRING DIAGRAM

Refer to B2799.

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CAUTION / NOTICE / HINT

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&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 certification ECU (smart key ECU assembly), refer to Service Bulletin.

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

    Click here

Tech Tips

When the ECM and certification ECU (smart key ECU assembly) DTC are output simultaneously, first perform troubleshooting for the ECM and certification ECU (smart key ECU assembly) DTC.

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Entry&Start > 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. INSPECT ECM (TERMINAL IMI AND IMO)


    1. Using an oscilloscope, check the waveform.

      B003M27C02
      *1 Waveform (IMO) *2 Waveform (IMI)
      *3 Waveform A *4 Waveform B
      *5 Waveform C - -
      *a

      Component with harness connected

      (ECM)

      		 *b Approximately 160 ms
      *c Approximately 270 ms *d Approximately 40 ms
      *e Approximately 60 ms - -

      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

      G50-17 (IMO) - Body ground

      G50-16 (IMI) - Body ground
      Tool Setting 2 V/DIV., 500 ms./DIV.
      Condition Within 3 seconds after engine starts, or within 3 seconds after engine switch turned on (IG) after battery 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 (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM) Click here

    C

    REPLACE ECM Click here

    D

    GO TO STEP 7 Click here

    A

  4. REGISTER ECU COMMUNICATION ID


    1. Reregister the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK WHETHER ENGINE STARTS


    1. Using a registered vehicle key, turn the engine switch on (IG).

      OK
      Engine starts normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

  6. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM)


    1. Disconnect the G17 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the G50 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G17-35 (EFIO) - G50-16 (IMI) Always Below 1 Ω
      G17-35 (EFIO) - Body ground Always 10 kΩ or higher
      G50-16 (IMI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Replace the certification ECU (smart key ECU assembly) with a new one.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  8. REGISTER RECOGNITION CODES


    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. Reregister the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK WHETHER ENGINE STARTS


    1. Using a registered vehicle key, turn the engine switch on (IG).

      OK
      Engine starts normally.
      Result
      Result Proceed to
      OK A
      NG B

    A

    END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)

    B

    GO TO ECD SYSTEM Click here