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Terminals Of Ecu

  1. CHECK TRANSPONDER KEY AMPLIFIER 
    Fig 1: Identifying Transponder Key Amplifier Connector Terminal T7
    G05541305Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T7 amplifier connector.
    2. Measure the resistance of the wire harness side connector.
      RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T7-7) - Body ground V - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the 17 amplifier connector.
    4. Measure the resistance and voltage of the connector.
      RESISTANCE AND VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T7-7) - Body ground V - Body ground Ground Always Below 1 Ω
      VC5 (T7-1) - GND (T7-7) L - V Power source No key in ignition key cylinder Below 1 V
      Key inserted 4.6 to 5.4 V
      CODE (T7-4) - GND (T7-7) Y - V Demodulated signal of key code data No key in ignition key cylinder Below 1 V
      Key inserted Pulse generation (see  1waveform 1)
      TXCT (T7-5) - GND (T7-7) R - V Key code output signal No key in ignition key cylinder Below 1 V
      Key inserted Pulse generation (see  2waveform 2)

      If the result is not as specified, the amplifier may have a malfunction.

    5. Inspect using an oscilloscope.
      1. Waveform 1 (Reference)
        WAVEFORM REFERENCE (WAVEFORM 1)

        Item Content
        Symbols (Terminal No.) CODE (T7-4) - GND (T7-7)
        Tool Setting 2 V/DIV., 20 msec./DIV.
        Condition Key inserted
        Fig 2: Identifying Waveform 1
        G05541306Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference)
        WAVEFORM REFERENCE (WAVEFORM 2)

        Item Content
        Symbols (Terminal No.) TXCT (T7-5) - GND (T7-7)
        Tool Setting 2 V/DIV., 20 msec./DIV.
        Condition Key inserted
        Fig 3: Identifying Waveform 2
        G05541307Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK TRANSPONDER KEY ECU ASSEMBLY 
    Fig 4: Identifying Transponder Key ECU Assembly Connector Terminal T8
    G05541308Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T8 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      VOLTAGE AND RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (T8-13) - Body ground V - Body ground Ground Always Below 1 Ω
      GND (T8-14) - Body ground BR-W - Body ground Ground Always Below 1 Ω
      +B (T8-1) - GND (T8-14) P - BR-W Power source supply Always 10 to 14 V
      IG (T8-2) - GND (T8-14) LG - BR-W Ignition power supply Ignition switch OFF Below 1 V
      Ignition switch ON 10 to 14 V
      KSW (T8-10) - GND (T8-14) B - BR-W Unlock warning switch No key in ignition key cylinder 10 kΩ or higher
      Key inserted Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the T8 ECU connector.
    4. Measure the voltage of the connector.
      VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      KSW (T8-10) - GND (T8-14) B - BR-W Unlock warning switch No key in ignition key cylinder 10 to 14 V
      Key inserted Below 1 V
      VC5 (T8-8) - GND (T8-14) L - BR-W Power source of transponder key amplifier Ignition switch OFF Below 1 V
      Ignition switch ON 4.6 to 5.4 V
      CODE (T8-11) - AGND (T8-13) Y - V Transponder key amplifier communication signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see  1waveform 1)
      TXCT (T8-12) - AGND (T8-13) R - V Transponder key amplifier communication signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see  2waveform 2)
      EFIO (T8-6) - GND (T8-14) O - BR-W ECM output signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see  3waveform 3)
      EFII (T8-7) - GND (T8-14) GR - BR-W ECM output signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see  4waveform 4)
      CTY (T8-4) - GND (T8-14) BR - BR-W Door courtesy switch Driver side door fully closed 10 to 14 V
      Driver side door open Below 1 V
      IND (T8-3) (*1) - GND (T8-14) B - BR-W Security indicator light Engine immobiliser system set (indicator is blinking) Alternating between 10 to 14 V (0.2 sec.) and below 1 V (1.8 sec.)
      HINT:
      *1: w/Cruise Control

      If the result is not as specified, the ECU may have a malfunction.

    5. Inspect using an oscilloscope.
      1. Waveform 1 (Reference)
        WAVEFORM REFERENCE (WAVEFORM 1)

        Item Content
        Symbols (Terminal No.) CODE (T8-11) - AGND (T8-13)
        Tool Setting 2V/DIV., 20 msec./DIV.
        Condition Key inserted
        Fig 5: Identifying Waveform 1 (Reference)
        G05541309Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference)
        WAVEFORM REFERENCE (WAVEFORM 2)

        Item Content
        Symbols (Terminal No.) TXCT (T8-12) - AGND (T8-13)
        Tool Setting 2 V/DIV., 20 msec./DIV.
        Condition Key inserted
        Fig 6: Identifying Waveform 2 (Reference)
        G05541307Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Waveform 3 (Reference)
        WAVEFORM REFERENCE (WAVEFORM 3)

        Item Content
        Symbols (Terminal No.) EFIO (T8-6) - GND (T8-14)
        Tool Setting 10 V/DIV., 100 msec./DIV.
        Condition Ignition switch ON
        Fig 7: Identifying Waveform 3 (Reference)
        G05541311Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Waveform 4 (Reference)
        WAVEFORM REFERENCE (WAVEFORM 4)

        Item Content
        Symbols (Terminal No.) EFII (T8-7) - GND (T8-14)
        Tool Setting 10 V/DIV., 100 msec./DIV.
        Condition Ignition switch ON
        Fig 8: Identifying Waveform 4 (Reference)
        G05541312Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CHECK ECM 
    Fig 9: Identifying ECM Connector Terminal
    G05131853Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance of the connectors.
      VOLTAGE AND RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      E01 (E8-7) - Body ground B - Body ground Ground Always Below 1 Ω
      EOM (E4-29) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E02 (E8-6) - Body ground P - Body ground Ground Always Below 1 Ω
      E1 (E8-3) - Body ground L - Body ground Ground Always Below 1 Ω
      BATT (E4-3) - E1 (E8-3) V - L Battery Always 10 to 14 V
      +B (E4-1) - E1 (E8-3) GR - L Ignition power supply Ignition switch ON 10 to 14 V
      IMI (E5-16) - E1 (E8-3) O - L Transponder key ECU input signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see  1waveform 1)
      IMO (E5-15) - E1 (E8-3) GR - L Transponder key ECU output signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see  2waveform 2)

      If the result is not as specified, the ECM may have a malfunction.

    2. Inspect using an oscilloscope.
      1. Waveform 1 (Reference)
        WAVEFORM REFERENCE (WAVEFORM 1)

        Item Content
        Symbols (Terminal No.) IMI (E5-27) - E1 (E8-3)
        Tool Setting 10V/DIV., 100 msec./DIV.
        Condition Ignition switch ON
        Fig 10: Identifying Waveform 1 (Reference)
        G05541311Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference)
        WAVEFORM REFERENCE (WAVEFORM 2)

        Item Content
        Symbols (Terminal No.) IMO (E5-26) - E1 (E8-3)
        Tool Setting 10 V/DIV., 100 msec./DIV.
        Condition Ignition switch ON
        Fig 11: Identifying Waveform 2 (Reference)
        G05541312Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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