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Terminals Of Ecu

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  1. CHECK TRANSPONDER KEY ECU ASSEMBLY 
    Fig 1: Identifying Transponder Key ECU
    G04438444Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T19 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.
      TRANSPONDER KEY ECU (1 OF 2)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T19-14) - Body ground W-B - Body ground Ground Always Below 1 Ω
      +B (T19-1) - GND (T19-14) L-W - W-B Power source supply Always 10 to 14 V
      KSW (T19-10) - GND (T19-14) R-B - W-B Unlock warning switch Key inserted in ignition key cylinder Below 1 Ω
      No key in ignition key cylinder 10 kΩ or higher

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

    3. Reconnect the T19 ECU connector.
    4. Measure the resistance and voltage of the connector.
      TRANSPONDER KEY ECU (2 OF 2)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T19-14) - Body ground W-B - Body ground Ground Always Below 1 Ω
      VC5 (T19-8) - GND (T19-14) Y - W-B Power source No key in ignition key cylinder Below 1 V
      Key inserted 10 to 14 V
      TXCT (T19-12) - GND (T19-14) V-G - W-B Key code output signal No key in ignition key cylinder Below 1 V
      Key inserted Pulse generation (see WAVEFORM 1 (REFERENCE)  )
      CODE (T19-11) - GND (T19-14) L-B - W-B Demodulated signal of key code data No key in ignition key cylinder Below 1 V
      Key inserted Pulse generation (see WAVEFORM 2 (REFERENCE)  )
      EFIO (T19-6) - GND (T19-14) W - W-B ECM output signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see WAVEFORM 3 (REFERENCE)  )
      EFII (T19-7) - GND (T19-14) Y - W-B ECM input signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see WAVEFORM 4 (REFERENCE)  )
      KSW (T19-10) - GND (T19-14) R-B - W-B Unlock warning switch Key inserted Below 1 V
      No key in ignition key cylinder 10 to 14 V
      IND (T19-3) - GND (T19-14) G-R - W-B Security indicator signal Key inserted Below 1 V
      No key in ignition key cylinder Pulse generation

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

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

        Item Content
        Symbols (Terminal No.) TXCT (T19-12) - GND (T19-14)
        Tool Setting 5 V/DIV., 20 msec./DIV.
        Condition Key inserted
        Fig 2: Identifying Waveform 1 (Reference)
        G04438445Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference)
        WAVEFORM 2 (REFERENCE)

        Item Content
        Symbols (Terminal No.) CODE (T19-11) - GND (T19-14)
        Tool Setting 5 V/DIV., 20 msec./DIV.
        Condition Key inserted
        Fig 3: Identifying Waveform 2 (Reference)
        G04438446Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Waveform 3 (Reference)
        WAVEFORM 3 (REFERENCE)

        Item Content
        Symbols (Terminal No.) EFIO (T19-6) - GND (T19-14)
        Tool Setting 10 V/DIV., 50 msec./DIV.
        Condition Ignition switch ON
        Fig 4: Identifying Waveform 3 (Reference)
        G04438447Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Waveform 4 (Reference)
        WAVEFORM 4 (REFERENCE)

        Item Content
        Symbols (Terminal No.) EFII (T19-7) - GND (T19-14)
        Tool Setting 10 V/DIV., 50 msec./DIV.
        Condition Ignition switch ON
        Fig 5: Identifying Waveform 4 (Reference)
        G04438448Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK ECM 
    Fig 6: Identifying ECM
    G04438449Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance and voltage of the connectors.
      ECM

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      E1 (E7-1) - Body ground BR - Body ground Ground Always Below 1 Ω
      BATT (E9-3) - E1 (E7-1) B-R - BR Battery (for measuring battery voltage and for ECM memory) Always 10 to 14 V
      +BM (E9-7) - E1 (E7-1) Y-B BR Power source of ECM Ignition switch OFF Below 1 V
      Ignition switch ON 10 to 14 V
      +B (E9-1) - E1 (E7-1) B-Y-BR Power source of ECM Ignition switch OFF Below 1 V
      Ignition switch ON 10 to 14 V
      +B2 (E9-2) - E1 (E7-1) B-Y - BR Power source of ECM Ignition switch OFF Below 1 V
      Ignition switch ON 10 to 14 V
      IGSW (E9-9) - E1 (E7-1) B-R-BR Ignition power supply of ECM Ignition switch OFF Below 1 V
      Ignition switch ON 10 to 14 V
      IMI (E8-16) - E1 (E7-1) W-BR Transponder key ECU input signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see WAVEFORM 1 (1 OF 2) )
      IMO (E8-15) - E1 (E7-1) Y-BR Transponder key ECU output signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see WAVEFORM 1 (2 OF 2) )

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

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

        Item Content
        Symbols (Terminal No.) IMI (E8-16) - E1 (E7-1)
        Tool Setting 10 V/DIV., 50 msec./DIV.
        Condition Ignition switch ON
        Fig 7: Identifying Waveform 1 (Reference) (1 Of 2)
        G04438450Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 1 (Reference)
        WAVEFORM 1 (2 OF 2)

        Item Content
        Symbols (Terminal No.) IMO (E8-15) - E1 (E7-1)
        Tool Setting 10 V/DIV., 50 msec./DIV.
        Condition Ignition switch ON
        Fig 8: Identifying Waveform 1 (Reference) (2 Of 2)
        G04438451Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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