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Terminals Of Ecu

  1. CHECK TRANSPONDER KEY AMPLIFIER 
    Fig 1: Identifying Transponder Key Amplifier Connector Terminals
    G04466286Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T9 amplifier connector.
    2. Measure the resistance according to the value(s) in ECU TERMINALS RESISTANCE SPECIFICATION  .
      ECU TERMINALS RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T9-7) - Body ground Y - 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 T9 amplifier connector.
    4. Measure the voltage and resistance according to the value(s) in ECU TERMINALS VOLTAGE SPECIFICATION  .
      ECU TERMINALS VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      VC5 (T9-1) - GND (T9-7) G-R - Y Power source No key in ignition key cylinder -> Key inserted 0 V -> 4.6 to 5.4 V
      CODE (T9-4) - GND (T9-7) L - Y Demodulated signal of key code data No key in ignition key cylinder -> Key inserted Pulse generation (see waveform 1)
      TXCT (T9-5) - GND (T9-7) G - Y Key code output signal No key in ignition key cylinder -> Key inserted Pulse generation (see waveform 2)

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

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

        Terminal CODE - AGND
        Tool Setting 10 V/DIV., 20 ms/DIV.
        Condition No key in ignition key cylinder --> Key inserted
        Fig 2: Identifying Waveform 1
        G04466287Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference):
        WAVEFORM 2

        Terminal CODE - AGND
        Tool Setting 5 V/DIV., 20 ms/DIV.
        Condition No key in ignition key cylinder --> Key inserted
        Fig 3: Identifying Waveform 2
        G04466288Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK TRANSPONDER KEY ECU ASSEMBLY 
    Fig 4: Identifying Transponder Key ECU Connectors
    G04466289Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T10 ECU connector, and measure the voltage and resistance according to the value(s) in TRANSPONDER KEY ECU ASSEMBLY (DISCONNECT)  .
      TRANSPONDER KEY ECU ASSEMBLY (DISCONNECT)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B (T10-1) - GND (T10-16) R-B - W-B Battery Always 10 to 14 V
      IG (T10-2) - GND (T10-16) B-W - W-B Ignition switch Ignition switch OFF -> ON Below 1 V -> 10 to 14 V
      GND (T10-16) - Body ground W-B - 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 T10 ECU connector, and measure the voltage according to the value(s) in TRANSPONDER KEY ECU ASSEMBLY (RECONNECTED)  .
      TRANSPONDER KEY ECU ASSEMBLY (RECONNECTED)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      KSW (T10-3) - GND (T10-16) L-B - W-B Unlock warning switch No key in ignition key cylinder -> Key inserted 10 to 14 V -> Below 1 V
      TXCT (T10-4) - AGND (T10-5) G - Y Transponder key amplifier communication signal Ignition switch ON Waveform 1
      CTY (T10-7) - GND (T10-16) R-W - W-B Courtesy signal Driver side door is open -> closed 10 to 14 V -> Below 1 V
      IND (T10-8) - GND (T10-16) R-W - W-B Security indicator signal Engine immobilizer system SET -> UNSET 3 to 5 V -> Below 1 V
      D (T10-9) - GND (T10-16) L-R - W-B Diagnosis tester communication Ignition switch ON Pulse generation
      EFII (T10-12) - GND (T10-16) B - W-B ECM input signal Ignition switch ON Waveform 4
      EFIO (T10-13) - GND (T10-16) W - W-B ECM output signal Ignition switch ON Waveform 3
      VC5 (T10-14) - AGND (T10-5) GR - Y Power source Ignition switch OFF -> ON Below 1 V -> 4.6 to 5.4 V
      CODE (T10-15) - AGND (T10-5) L - Y Transponder key amplifier ground Ignition switch ON Waveform 2

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

    3. Inspect using an oscilloscope.
      1. Waveform 1 (Reference):
        WAVEFORM 1

        Terminal TXCT - AGND
        Tool Setting 5 V/DIV., 20 ms/DIV.
        Condition Ignition switch ON
        Fig 5: Identifying Waveform 1
        G04466290Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference):
        WAVEFORM 2

        Terminal CODE - AGND
        Tool Setting 5 V/DIV., 20 ms/DIV.
        Condition Ignition switch ON
        Fig 6: Identifying Waveform 2
        G04466291Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Waveform 3 (Reference):
        WAVEFORM 3

        Terminal EFIO - GND
        Tool Setting 10 V/DIV., 500 ms/DIV.
        Condition Ignition switch ON
        Fig 7: Identifying Waveform 3
        G04466292Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Waveform 4 (Reference):
        WAVEFORM 4

        Terminal EFII - GND
        Tool Setting 10 V/DIV., 500 ms/DIV.
        Condition Ignition switch ON
        Fig 8: Identifying Waveform 4
        G04466293Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value(s) in TRANSPONDER KEY ECU (RESISTANCE)  .
      TRANSPONDER KEY ECU (RESISTANCE)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (T10-5) - GND (T10-16) Y - W-B Amplifier ground circuit Always Below 1 Ω

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

  3. CHECK ECM 
    Fig 9: Identifying ECM Connectors
    G04466294Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance according to the value(s) in ECM (VOLTAGE AND RESISTANCE)  .
      ECM (VOLTAGE AND RESISTANCE)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IMI (E5-27) - EOM (E6-15) W - W-B Transponder key ECU output signal No key in ignition key cylinder -> Key inserted Pulse generation (see waveform 1)
      IMO (E5-26) - EOM (E6-15) B - W-B Transponder key ECU input signal No key in ignition key cylinder -> Key inserted Pulse generation (see waveform 2)
      EOM (E6-15) - Body ground W-B - 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. Inspect using an oscilloscope.
      1. Waveform 1 (Reference):
        WAVEFORM 1

        Terminal IMI - EOM
        Tool Setting 10 V/DIV., 500 ms/DIV.
        Condition No key in ignition key cylinder -> Key inserted
        Fig 10: Identifying Waveform 1
        G04466295Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference):
        WAVEFORM 2

        Terminal IMO - EOM
        Tool Setting 10 V/DIV., 500 ms/DIV.
        Condition No key in ignition key cylinder -> Key inserted
        Fig 11: Identifying Waveform 2
        G04466296Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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