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.

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, ID code box (immobiliser code ECU)*1, or certification ECU (smart key ECU assembly)*2, refer to Service Bulletin.


    • *1: w/ Rear Seat Heater

    • *2: w/o Rear Seat Heater

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

Tech Tips

If a 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
      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

    NG

  3. INSPECT ECM (TERMINAL IMI AND IMO)


    1. Using an oscilloscope, check the waveform.

      A002B4YC12
      *A for 1AR-FE *B for 2GR-FE
      *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) - -

      Note

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

      Measurement Condition
      Tester Connection Condition Tool Setting Specified Condition
      A43-30 (IMO) - C1-49 (E1)*2 Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected 2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform (IMO))
      A43-29 (IMO) - C1-16 (E1)*1 Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected 2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform (IMO))
      A43-31 (IMI) - C1-49 (E1)*2 Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected 2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform (IMI))
      A43-28 (IMI) - C1-16 (E1)*1 Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected 2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform (IMI))

      • *1: for 1AR-FE

        *2: for 2GR-FE

      Result
      Result Proceed to
      Normal waveform A
      Waveform A not output, or has abnormal wavelength or shape (w/ Rear Seat Heater) B
      Waveform A not output, or has abnormal wavelength or shape (w/o Rear Seat Heater) C
      Waveform B not output, or has abnormal wavelength or shape D
      Waveform C not output, or has abnormal wavelength or shape (w/ Rear Seat Heater) E
      Waveform C not output, or has abnormal wavelength or shape (w/o Rear Seat Heater) F

    B

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

    C

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM) Click here

    D

    REPLACE ECM for 1AR-FE: Click here
    REPLACE ECM for 2GR-FE: Click here

    E

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU) Click here

    F

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    A

  4. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  5. 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

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


    1. Disconnect the F67 ID code box (immobiliser code ECU) connector.

    2. Disconnect the A43 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F67-3 (EFII) - A43-30 (IMO)*2 Always Below 1 Ω
      F67-3 (EFII) - A43-29 (IMO)*1 Always Below 1 Ω
      F67-4 (EFIO) - A43-31 (IMI)*2 Always Below 1 Ω
      F67-4 (EFIO) - A43-28 (IMI)*1 Always Below 1 Ω
      F67-3 (EFII) or A43-30 (IMO) - Body ground*2 Always 10 kΩ or higher
      F67-3 (EFII) or A43-29 (IMO) - Body ground*1 Always 10 kΩ or higher
      F67-4 (EFIO) or A43-31 (IMI) - Body ground*2 Always 10 kΩ or higher
      F67-4 (EFIO) or A43-28 (IMI) - Body ground*1 Always 10 kΩ or higher

      • *1: for 1AR-FE

        *2: for 2GR-FE

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 8 Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the F10 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the A43 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F10-7 (EFII) - A43-30 (IMO) Always Below 1 Ω
      F10-6 (EFIO) - A43-31 (IMI) Always Below 1 Ω
      F10-7 (EFII) or A43-30 (IMO) - Body ground Always 10 kΩ or higher
      F10-6 (EFIO) or A43-31 (IMI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 12 Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  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. Reregister 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
      Proceed to
      OK
      NG

    OK

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

    NG

    GO TO SFI SYSTEM for 1AR-FE: Click here
    GO TO SFI SYSTEM for 2GR-FE: Click here

  12. 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

    GO TO STEP 9 Click here