ENGINE IMMOBILISER SYSTEM Engine does not Start

DESCRIPTION

If the engine does not start and no DTCs are output, there is an open or short circuit between the ECM or transponder key ECU assembly.

WIRING DIAGRAM

A01DVGHE01

INSPECTION PROCEDURE

Note


  • Before troubleshooting this symptom, make sure no engine immobiliser system DTCs, SFI system (for 1TR-FE, 2TR-FE, 1GR-FE) or ECD system (for 1KD-FTV, 2KD-FTV) DTCs are present. If present, troubleshoot the engine immobiliser system DTCs first.

  • When replacing the transponder key ECU assembly or ECM, refer to the Service Bulletin.

PROCEDURE


  1. CHECK TRANSPONDER KEY ECU ASSEMBLY (OUTPUT)


    1. A01E267E02
      Text in Illustration
      *1 Waveform
      *a

      Component with harness connected

      (Transponder Key ECU Assembly)

      Using an oscilloscope, check the waveform.

      Measurement Condition
      Item Content
      Tester Connection T21-13 (EFIO) - T21-16 (GND)
      Tool Setting 10 V/DIV., 100 ms./DIV.
      Condition Ignition switch ON

      Tech Tips


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

      • Check the waveform when the security indicator light assembly is off (the engine immobiliser system is unset). If the security indicator light assembly does not turn off (the engine immobiliser system cannot be unset), refer to the "Problem Symptoms Table Click here".

      OK
      Waveform is output normally (refer to illustration).
      Result
      Result Proceed to
      NG (stuck LOW: 1 V or less) A
      NG (stuck HI: 10 V) B
      OK C

      Tech Tips

      If replacing the ECM, refer to the procedures below.



    B

    REPLACE ECM

    C

    REGISTER ECU COMMUNICATION ID Click here

    A

  2. REPLACE TRANSPONDER KEY ECU ASSEMBLY


    1. Temporarily replace the transponder key ECU assembly with a new one (Refer to the Service Bulletin).


    NEXT

  3. REGISTER ECU COMMUNICATION ID


    1. Register the ECU - ECM communication ID (Refer to the Service Bulletin).


    NEXT

  4. CHECK WHETHER ENGINE STARTS


    1. Check that the engine starts normally.

      OK
      Engine starts normally.

      Tech Tips

      If replacing the ECM, refer to the procedures below.



    NG

    REPLACE ECM

    OK

    END (TRANSPONDER KEY ECU IS DEFECTIVE)

  5. REGISTER ECU COMMUNICATION ID


    1. Register the ECU - ECM communication ID (Refer to the Service Bulletin).


    NEXT

  6. CHECK WHETHER ENGINE STARTS


    1. Check that the engine starts normally.

      OK
      Engine starts normally.

      Tech Tips

      If replacing the ECM, refer to the procedures below.



    NG

    REPLACE ECM

    OK

    END (ECU COMMUNICATION ID IS NOT REGISTERED CORRECTLY)