ENGINE IMMOBILISER SYSTEM > TERMINALS OF ECU

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CHECK TRANSPONDER KEY AMPLIFIER


  1. Disconnect the T7 amplifier connector and measure the resistance between the terminal of the wire harness side connector and body ground.


    B065593E07


    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    GND (T7-7) - Body ground
    		W - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.

  2. Reconnect the T8 amplifier connector and measure the resistance and voltage of each terminal of the connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    VC5 (T7-1) - GND (T7-7)
    		P - W
    		Power source
    		No key is in ignition key cylinder
    		Below 1 V
    Key is in ignition key cylinder
    		4.6 to 5.4 V
    CODE (T7-4) - GND (T7-7)
    		LG - W
    		Demodulated signal of key code date
    		No key is in ignition key cylinder
    		Below 1 V
    Key is in ignition key cylinder
    		Waveform 1
    TEXT (T7-5) - GND (T7-7)
    		BR - W
    		Key code output signal
    		No key is in ignition key cylinder
    		Below 1 V
    Key is in ignition key cylinder
    		Waveform 2
    GND (T7-7) - Body ground
    		W - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, the amplifier may have a malfunction.



  3. Inspect using an oscilloscope.



      B111835E01

    1. Waveform 1 (Reference):
      Terminal
      		CODE - GND
      Tool Setting
      		2 V/DIV., 20 ms/DIV.
      Condition
      		Key is in ignition key cylinder



      2. B111836E01

    2. Waveform 2 (Reference):
      Terminal
      		TXCT - GND
      Tool Setting
      		2 V/DIV., 10 ms/DIV.
      Condition
      		Key is in ignition key cylinder


CHECK TRANSPONDER KEY ECU ASSEMBLY


  1. Disconnect the T8 ECU connector and measure the resistance and voltage between each terminal of the wire harness side connector.


    B111613E06


    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    CPUB (T8-1) - GND (T8-14)
    		V - W-B
    		Battery
    		Always
    		10 to 14 V
    IG2 (T8-2) - GND (T8-14)
    		V - W
    		Ignition switch
    		Ignition switch off
    		Below 1 V
    Ignition switch on
    		10 to 14 V
    KSW (T8-3) - GND (T8-14)
    		B - W
    		Unlock warning switch
    		No key is in ignition key cylinder
    		10 kΩ or higher
    Key is in ignition key cylinder
    		Below 1 Ω
    MPX1 (T8-4) - Body ground
    		O - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (T8-5) - Body ground
    		R (LHD) - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (T8-5) - Body ground
    		Y (RHD) - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

  2. Reconnect the T8 ECU connector and measure the voltage of each terminal of the connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    AGND (T8-13) - Body ground
    		W - Body ground
    		Ground
    		Always
    		Below 1 Ω
    KSW (T8-3) - GND (T8-14)
    		B - W
    		Unlock warning switch
    		No key is in ignition key cylinder
    		10 to 14 V
    Key is in ignition key cylinder
    		Below 1 V
    VC5 (T8-9) - AGND (T8-13)
    		P - W
    		Power source
    		Ignition switch off
    		Below 1 V
    Ignition switch on
    		4.6 to 5.4 V
    TXCT (T8-12) - AGND (T8-13)
    		BR - W
    		Transponder key amplifier communication signal
    		No key is in ignition key cylinder
    		Below 1 V
    Key is in ignition key cylinder
    		Waveform 1
    CODE (T8-10) - AGND (T8-13)
    		LG - W
    		Transponder key amplifier ground
    		No key is in ignition key cylinder
    		Below 1 V
    Key is in ignition key cylinder
    		Waveform 2
    EFIO (T8-6) - GND (T8-14)
    		GR - W
    		Hybrid vehicle control ECU output signal
    		Ignition switch off
    		Below 1 V
    Ignition switch on
    		Waveform 3
    EFII (T8-7) - GND (T8-14)
    		L - W
    		Hybrid vehicle control ECU input signal
    		Ignition switch off
    		Below 1 V
    Ignition switch on
    		Waveform 4
    If the result is not as specified, the ECU may have a malfunction.



  3. Inspect using an oscilloscope.



      B111836E01

    1. Waveform 1 (Reference):
      Terminal
      		TXCT - AGND
      Tool Setting
      		2 V/DIV., 10 ms/DIV.
      Condition
      		Key is in ignition key cylinder



      2. B111835E01

    2. Waveform 2 (Reference):
      Terminal
      		CODE - AGND
      Tool Setting
      		2 V/DIV., 20 ms/DIV.
      Condition
      		Key is in ignition key cylinder



      3. B111838E01

    3. Waveform 3 (Reference):
      Terminal
      		EFIO - GND
      Tool Setting
      		2 V/DIV., 1 s/DIV.
      Condition
      		Ignition switch on



      4. B111837E01

    4. Waveform 4 (Reference):
      Terminal
      		EFII - GND
      Tool Setting
      		2 V/DIV., 200 ms/DIV.
      Condition
      		Ignition switch on


CHECK HYBRID VEHICLE CONTROL ECU


  1. Disconnect the H32 hybrid vehicle control ECU connector and measure the resistance between the terminal of the wire harness side connector and body ground.


    B111585E04


    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    E1 (H32-5) - Body ground
    		BR - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.

  2. Reconnect the H32 hybrid vehicle control ECU. Measure the voltage between each terminal of the connector according to the value(s) in the table below.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IMI (H29-22) - E1 (H32-5)
    		GR - BR
    		Transponder key ECU input signal
    		Ignition switch off
    		Below 1 V
    Ignition switch on
    		Waveform 1
    IMO (H29-28) - E1 (H32-5)
    		L- BR
    		Transponder key ECU output signal
    		Ignition switch off
    		Below 1 V
    Ignition switch on
    		Waveform 2
    If the result is not as specified, there may be a malfunction on the wire harness side.



  3. Inspect using an oscilloscope.



      B111838E01

    1. Waveform 1 (Reference):
      Terminal
      		IMI - E1
      Tool Setting
      		2 V/DIV., 1 s/DIV.
      Condition
      		Ignition switch on



      2. B111837E01

    2. Waveform 2 (Reference):
      Terminal
      		IMO - E1
      Tool Setting
      		2 V/DIV., 200 ms/DIV.
      Condition
      		Ignition switch on