Engine Immobiliser System Terminals Of Ecu

Securities. Lexus Gs430, Gs300. Uzs190 Grs190
Engine Immobiliser. Lexus Gs430, Gs300. Uzs190 Grs190

  1. CHECK ENGINE SWITCH

  1. CHECK CERTIFICATION ECU

  1. CHECK IMMOBILISER CODE ECU

  1. CHECK POWER SOURCE CONTROL ECU

  1. CHECK STEERING LOCK ECU

  1. CHECK ECM (3GR-FSE, 3GR-FE)

  1. CHECK ECM (3UZ-FE)

  1. CHECK COWL SIDE JUNCTION BLOCK RH (MULTIPLEX NETWORK BODY ECU)

Engine Immobiliser System -- Terminals Of Ecu



CHECK ENGINE SWITCH

Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

  1. Disconnect the L29 switch connector.

  2. Measure the resistance of the wire harness side connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    GND (L29-5) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    1. If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Reconnect the L29 switch connector.

  4. Measure the resistance and voltage of the connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    AGND (L29-8) - Body ground
    		V - Body ground
    		Ground
    		Always
    		Below 1 Ω
    VC5 (L29-14) - AGND(L29-8)
    		LG - V*1
    O - V*2
    		Power supply
    		Engine immobiliser system is set (key is not in cabin)
    		Below 1 V
    VC5 (L29-14) - AGND(L29-8)
    		LG - V*1
    O - V*2
    		Power supply
    		Press engine switch*3
    		4.6 to 5.4 V
    CODE (L29-10) - AGND (L29-8)
    		Y - V
    		Demodulated signal of key code data
    		Engine immobiliser system is set (key is not in cabin)
    		Below 1 V
    CODE (L29-10) - AGND (L29-8)
    		Y - V
    		Demodulated signal of key code data
    		Press engine switch and hold key close to engine switch*3
    		Pulse generation (see waveform 1)
    TXCT (L29-9) - AGND (L29-8)
    		L - V
    		Key code output signal
    		Engine immobiliser system is set (key is not in cabin)
    		Below 1 V
    TXCT (L29-9) - AGND (L29-8)
    		L - V
    		Key code output signal
    		Press engine switch and hold key close to engine switch*3
    		Pulse generation (see waveform 2)
    HINT:
    1. *1: LHD
    2. *2: RHD
    3. *3: Remove the key's battery before performing this inspection.
    1. If the result is not as specified, the switch may have a malfunction.


  5. Inspect using an oscilloscope.



      Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

    1. Waveform 1 (Reference)

      Item
      		Content
      Symbols (Terminal No.)
      		CODE (L29-10) - AGND (L29-8)
      Tool Setting
      		2 V/DIV., 20 msec./DIV.
      Condition
      		Press engine switch and hold key close to engine switch*
      HINT:
      *: Remove the key's battery before performing this inspection.


      2. Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

    2. Waveform 2 (Reference)

      Item
      		Content
      Symbols (Terminal No.)
      		TXCT (L29-9) - AGND (L29-8)
      Tool Setting
      		2 V/DIV., 20 msec./DIV.
      Condition
      		Press engine switch and hold key close to engine switch*
      HINT:
      *: Remove the key's battery before performing this inspection.

CHECK CERTIFICATION ECU

Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

  1. Disconnect the V28 ECU connector.

  2. Measure the resistance and voltage of the wire harness side connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    E (V28-17) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    +B1 (V28-1) - E (V28-17)
    		R - W-B
    		+B power supply
    		Always
    		10 to 14 V
    IG (V28-18) - E (V28-17)
    		B - W-B
    		Ignition power supply
    		Engine switch off
    		Below 1 V
    1. If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Reconnect the V28 connector.

  4. Measure the resistance and voltage of the connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    AGND (V28-40) - Body ground
    		V - Body ground
    		Engine switch ground
    		Always
    		Below 1 Ω
    VC5 (V28-30) - AGND(V28-40)
    		O - V
    		Engine switch power supply
    		Engine immobiliser system is set (key is not in cabin)
    		Below 1 V
    VC5 (V28-30) - AGND(V28-40)
    		O - V
    		Engine switch power supply
    		Press engine switch*
    		4.6 to 5.4 V
    CODE (V28-9) - AGND (V28-40)
    		Y - V
    		Engine switch CODE input
    		Engine immobiliser system is set (key is not in cabin)
    		Below 1 V
    CODE (V28-9) - AGND (V28-40)
    		Y - V
    		Engine switch CODE input
    		Press engine switch and hold key close to engine switch*
    		Pulse generation (see waveform 1)
    TXCT (V28-8) - AGND (V28-40)
    		L - V
    		Engine switch TX output
    		Engine immobiliser system is set (key is not in cabin)
    		Below 1 V
    TXCT (V28-8) - AGND (V28-40)
    		L - V
    		Engine switch TX output
    		Press engine switch and hold key close to engine switch*
    		Pulse generation (see waveform 2)
    HINT:
    *: Remove the key's battery before performing this inspection.
    1. If the result is not as specified, the ECU may have a malfunction.


  5. Inspect using an oscilloscope.



      Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

    1. Waveform 1 (Reference)

      Item
      		Content
      Symbols (Terminal No.)
      		CODE (V28-9) - AGND (V28-40)
      Tool Setting
      		2 V/DIV., 20 msec./DIV.
      Condition
      		Press engine switch and hold key close to engine switch*
      HINT:
      *: Remove the key's battery before performing this inspection.


      2. Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

    2. Waveform 2 (Reference)

      Item
      		Content
      Symbols (Terminal No.)
      		TXCT (V28-8) - AGND (V28-40)
      Tool Setting
      		2 V/DIV., 20 msec./DIV.
      Condition
      		Press engine switch and hold key close to engine switch*
      HINT:
      *: Remove the key's battery before performing this inspection.

CHECK IMMOBILISER CODE ECU

Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

  1. Disconnect the L58 ECU connector.

  2. Measure the resistance and voltage of the wire harness side connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    GND (L58-8) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    +B (L58-1) - GND (L58-8)
    		G - W-B
    		+B power supply
    		Always
    		10 to 14 V
    1. If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Reconnect the L58 ECU connector.

  4. Measure the voltage of the connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    EFII (L58-5) - GND (L58-8)
    		P - W-B
    		ECM input signal
    		Engine switch off
    		Below 1 V
    EFII (L58-5) - GND (L58-8)
    		P - W-B
    		ECM input signal
    		Engine switch on (IG)
    		Pulse generation (see waveform 1)
    EFIO(L58-6) - GND (L58-8)
    		LG - W-B
    		ECM output signal
    		Engine switch off
    		Below 1 V
    EFIO (L58-6) - GND (L58-8)
    		LG - W-B
    		ECM output signal
    		Engine switch on (IG)
    		Pulse generation (see waveform 2)
    1. If the result is not as specified, the ECU may have a malfunction.


  5. Inspect using an oscilloscope.



      Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

    1. Waveform 1 (Reference)

      Item
      		Content
      Symbols (Terminal No.)
      		EFII (L58-5) - GND (L58-8)
      Tool Setting
      		10 V/DIV., 100 msec./DIV.
      Condition
      		Engine switch on (IG)


      2. Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

    2. Waveform 2 (Reference)

      Item
      		Content
      Symbols (Terminal No.)
      		EFIO (L58-6) - GND (L58-8)
      Tool Setting
      		10 V/DIV., 100 msec./DIV.
      Condition
      		Engine switch on (IG)

CHECK POWER SOURCE CONTROL ECU

Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

  1. Disconnect the L73 ECU connector.

  2. Measure the resistance and voltage of the wire harness side connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    GND2 (L73-6) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    AM2 (L73-12) - Body ground
    		BR -Body ground
    		+B power supply
    		Always
    		10 to 14 V
    AM1 (L73-33) - Body ground
    		O -Body ground
    		+B power supply
    		Always
    		10 to 14 V
    1. If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK STEERING LOCK ECU

Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

  1. Disconnect the L28 ECU connector.

  2. Measure the resistance and voltage of the wire harness side connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    SGND (L28-2) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    GND (L28-1) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    B (L28-7) - Body ground
    		L - Body ground
    		+B power supply
    		Always
    		10 to 14 V
    IG2 (L28-6) - Body ground
    		B - Body ground
    		Ignition power supply
    		Engine switch off
    		0 V
    IG2 (L28-6) - Body ground
    		B - Body ground
    		Ignition power supply
    		Engine switch on (IG)
    		10 to 14 V
    1. If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK ECM (3GR-FSE, 3GR-FE)

Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

  1. Measure the resistance and voltage of the connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    E1 (E7-7) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E01 (E6-2) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E02 (E6-1) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E03 (E8-6) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E04 (E45-5) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E05 (E45-3) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    EC (A6-2)- Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    ME01 (E8-4) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    BATT (A6-4) - E1 (E7-7)
    		L - BR
    		Battery (for measuring battery voltage and for ECM memory)
    		Always
    		10 to 14 V
    +B (A6-6) - E1 (E7-7)
    		B-R - BR
    		Power source of ECM
    		Engine switch off
    		Below 1 V
    +B (A6-6) - E1 (E7-7)
    		B-R - BR
    		Power source of ECM
    		Engine switch on (IG)
    		10 to 14 V
    +B1 (A6-5) - E1 (E7-7)
    		B-R - BR
    		Power source of ECM
    		Engine switch off
    		Below 1 V
    +B1 (A6-5) - E1 (E7-7)
    		B-R - BR
    		Power source of ECM
    		Engine switch on (IG)
    		10 to 14 V
    IMI (A7-6) - E1 (E7-7)
    		W-B - BR
    		Immobiliser code ECU input signal
    		Engine switch off
    		Below 1 V
    IMI (A7-6) - E1 (E7-7)
    		W-B - BR
    		Immobiliser code ECU input signal
    		Engine switch on (IG)
    		Pulse generation (see waveform 1)
    IMO (A7-7) - E1 (E7-7)
    		W-B - BR
    		Immobiliser code ECU output signal
    		Engine switch off
    		Below 1 V
    IMO (A7-7) - E1 (E7-7)
    		W-B - BR
    		Immobiliser code ECU output signal
    		Engine switch on (IG)
    		Pulse generation (see waveform 2)
    1. If the result is not as specified, the ECM may have a malfunction.


  2. Inspect using an oscilloscope.



      Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

    1. Waveform 1 (Reference)

      Item
      		Content
      Symbols (Terminal No.)
      		IMI (A7-6) - E1 (E7-7)
      Tool Setting
      		10 V/DIV., 100 msec./DIV.
      Condition
      		Engine switch on (IG)


      2. Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

    2. Waveform 2 (Reference)

      Item
      		Content
      Symbols (Terminal No.)
      		IMO (A7-7) - E1 (E7-7)
      Tool Setting
      		10 V/DIV., 100 msec./DIV.
      Condition
      		Engine switch on (IG)

CHECK ECM (3UZ-FE)

Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

  1. Measure the voltage and resistance of the connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    E1 (E7-7) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E01 (E6-2) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E02 (E6-1) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E03 (E8-6) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    EC (A6-2) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    ME01 (E8-4) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    BATT (A6-4) - E1 (E7-7)
    		L - BR
    		Battery (for measuring battery voltage and for ECM memory)
    		Always
    		10 to 14 V
    +B (A6-6) - E1 (E7-7)
    		B-R - BR
    		Power source of ECM
    		Engine switch off
    		Below 1 V
    +B (A6-6) - E1 (E7-7)
    		B-R - BR
    		Power source of ECM
    		Engine switch on (IG)
    		10 to 14 V
    +B1 (A6-5) - E1 (E7-7)
    		B-R - BR
    		Power source of ECM
    		Engine switch off
    		Below 1 V
    +B1 (A6-5) - E1 (E7-7)
    		B-R - BR
    		Power source of ECM
    		Engine switch on (IG)
    		10 to 14 V
    IMI (A7-6) - E1 (E7-7)
    		W-B - BR
    		Immobiliser code ECU input signal
    		Engine switch off
    		Below 1 V
    IMI (A7-6) - E1 (E7-7)
    		W-B - BR
    		Immobiliser code ECU input signal
    		Engine switch on (IG)
    		Pulse generation (see waveform 1)
    IMO (A7-7) - E1 (E7-7)
    		W-B - BR
    		Immobiliser code ECU output signal
    		Engine switch off
    		Below 1 V
    IMO (A7-7) - E1 (E7-7)
    		W-B - BR
    		Immobiliser code ECU output signal
    		Engine switch on (IG)
    		Pulse generation (see waveform 2)
    1. If the result is not as specified, the ECM may have a malfunction.


  2. Inspect using an oscilloscope.



      Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

    1. Waveform 1 (Reference)

      Item
      		Content
      Symbols (Terminal No.)
      		IMI (A7-6) - E1 (E7-7)
      Tool Setting
      		10 V/DIV., 100 msec./DIV.
      Condition
      		Engine switch on (IG)


      2. Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

    2. Waveform 2 (Reference)

      Item
      		Content
      Symbols (Terminal No.)
      		IMO (A7-7) - E1 (E7-7)
      Tool Setting
      		10 V/DIV., 100 msec./DIV.
      Condition
      		Engine switch on (IG)

CHECK COWL SIDE JUNCTION BLOCK RH (MULTIPLEX NETWORK BODY ECU)

Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System.Engine Immobiliser System Terminals Of Ecu

  1. Disconnect the DD and DM junction block connectors.

  2. Measure the resistance and voltage of the wire harness side connectors.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    GND2 (DD-7) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    IG (DM-1) - Body ground
    		B - Body ground
    		Ignition power supply
    		Engine switch off
    		Below 1 V
    IG (DM-1) - Body ground
    		B - Body ground
    		Ignition power supply
    		Engine switch on (IG)
    		10 to 14 V
    1. If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Reconnect the DD and DM junction block connectors.

  4. Measure the voltage of the connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IND (L67-24) - Body ground
    		LG - Body ground
    		Indicator light signal
    		Key is not in cabin (immobiliser system is not set)
    		Alternating between 10 to 14 V (0.2 seconds) to below 1 V
    1. If the result is not as specified, the junction block (ECU) may have a malfunction.