ENGINE IMMOBILISER SYSTEM Immobiliser System does not Operate Properly

DESCRIPTION

The engine 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

Click here.

INSPECTION PROCEDURE

CAUTION:


  • 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 power management control ECU or certification ECU (smart key ECU assembly), refer to Registration Click here.

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

Tech Tips

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

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs Click here.

      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 HYBRID CONTROL SYSTEM STARTS


    1. Check that the hybrid control system starts 5 seconds after the power switch turned on (IG).

      OK
      Hybrid control system starts normally.
      Result
      Result Proceed to
      NG A
      OK B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK POWER MANAGEMENT CONTROL ECU (TERMINAL IMI AND IMO)


    1. Using an oscilloscope, check the waveform.

      A01I5KME01
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

      		 *b Approximately 160 ms
      *c Approximately 270 ms *d Approximately 40 ms
      *e Approximately 60 ms *f Waveform 1
      *g Waveform 2 *h Waveform 3
      *i Waveform 1 (detail) - -
      Measurement Condition
      Tester Connection Condition Tool Setting Specified Condition
      A25-29 (IMO) - Body ground Within 3 seconds of hybrid control system start or within 3 seconds of power switch turned on (IG) after auxiliary battery cable disconnected and reconnected 2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform 2)
      A25-28 (IMI) - Body ground Within 3 seconds of hybrid control system start or within 3 seconds of power switch turned on (IG) after auxiliary battery cable disconnected and reconnected 2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform 1 and 3)
      Result
      Result Proceed to
      Normal waveform A
      Waveform 1 not output, or has abnormal wavelength or shape B
      Waveform 2 not output, or has abnormal wavelength or shape C
      Waveform 3 not output, or has abnormal wavelength or shape D

    B

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - POWER MANAGEMENT CONTROL ECU) Click here

    C

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    D

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    A

  4. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID Click here.


    NEXT

  5. CHECK WHETHER HYBRID CONTROL SYSTEM STARTS


    1. Check that the hybrid control system starts.

      OK
      Hybrid control system starts normally.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

    END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

  6. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the I87 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the I4 power management control system connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I87-10 (EFII) - I4-28 (IMO) Always Below 1 Ω
      I87-10 (EFII) or I4-28 (IMO) - Body ground Always 10 kΩ or higher
      I87-14 (EFIO) - I4-29 (IMI) Always Below 1 Ω
      I87-14 (EFIO) or I4-29 (IMI) - Body ground Always 10 kΩ or higher

    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 Click here.


    NEXT

  8. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID Click here.


    NEXT

  9. CHECK WHETHER HYBRID CONTROL SYSTEM STARTS


    1. Check that the hybrid control system starts.

      OK
      Hybrid control system starts normally.

    NG

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

    OK

    END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)