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Terminals Of Ecu

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  1. CHECK TRANSPONDER KEY AMPLIFIER 
    Fig 1: Identifying ECU Connector
    G04830928Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the D24 transponder key amplifier connector.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      ECU TERMINAL REFERENCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (D24-7) - Body ground GR - 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 D24 transponder key amplifier connector.
    4. Measure the resistance and voltage of the connector.

      Standard 

      ECU TERMINAL REFERENCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      VC5 (D24-1) - AGND (D24-7) P - GR Power source 1: No key in ignition key cylinder → 2: Key inserted 1: 0V → 2: 4.6 to 5.4 V
      CODE (D24-4) - AGND (D24-7) G - GR Demodulated signal of key code data No key in ignition key cylinder → Key inserted Pulse generation (see  1waveform 1)
      TXCT (D24-5) - AGND (D24-7) V - GR Key code output signal 1: No key in ignition key cylinder → 2: Key inserted Pulse generation (see  2waveform 2)
      AGND (D24-7) - Body ground GR - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction in the amplifier.

    5. Inspect using an oscilloscope.
      1. Waveform 1
        WAVEFORM REFERENCE 1

        Terminal CODE (D24-4) - AGND (D24-7)
        Tool Setting 5 V/DIV., 20 ms/DIV.
        Condition No key in ignition key cylinder → Key inserted
        Fig 2: Waveform Graph 1
        G04830929Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2
        WAVEFORM REFERENCE 2

        Terminal TXCT (D24-5) - AGND (D24-7)
        Tool Setting 5 V/DIV., 20 ms/DIV.
        Condition No key in ignition key cylinder → Key inserted
        Fig 3: Waveform Graph 2
        G04830930Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK TRANSPONDER KEY ECU ASSEMBLY 
    Fig 4: Identifying ECU Connector
    G04830931Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the D23 transponder key ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.

      Standard 

      ECU TERMINAL REFERENCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (D23-16) - Body ground W-B - Body ground Ground Always Below 1 Ω
      +B (D23-1) - GND (D23-16) L - W-B Battery Always 11 to 14 V
      IG (D23-2) - GND (D23-16) R - W-B Ignition switch Ignition switch
      1: OFF → 2: Key inserted      		 1: 0 V → 2: 11 to 14 V

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

    3. Reconnect the D23 transponder key ECU connector.
    4. Measure the voltage of the connector.

      Standard voltage 

      ECU TERMINAL REFERENCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition. Specified Condition
      KSW (D23-3) - AGND (D23-5) O - GR Unlock warning switch 1: No key in ignition key cylinder → 2: Key inserted 1: 11 to 14 V → 2: Below 1 V
      VC5 (D23-14) - AGND (D23-5) P - GR Power source 1: No key in ignition key cylinder → 2: Key inserted 1: 0 V → 2: 4.6 to 5.4 V
      TXCT (D23-4) - AGND (D23-5) V - GR Transponder key amplifier communication signal 1: No key in ignition key cylinder → 2: Key inserted Pulse generation (see  1waveform 1)
      CODE (D23-15) - AGND (D23-5) G - GR Transponder key amplifier communication signal 1: No key in ignition key cylinder → 2: Key inserted Pulse generation (see  2waveform 2)
      EFIO (D23-16) - GND (D23-11) W - BR ECM output signal Ignition switch OFF → ON Pulse generation (see  3waveform 3)
      EFII (D23-12) - GND (D23-16) O - BR ECM input signal Ignition switch OFF → ON Pulse generation (see  4waveform 4)
      CTY (D23-7) - GND (D23-16) B - W-B Courtesy signal 1: Driver side door open → 2: closed 1: 11 to 14 V → 2: Below 1 V
      IND (D23-8) - GND (D23-16) LG - W-B Security indicator signal Engine immobilizer system 1: SET → 2: UNSET 1: 3 to 5 V → 2: Below 1 V
      D (D23-9) - GND (D23-16) W - W-B Diagnosis tester communication Ignition switch ON Pulse generation

      If the result is not as specified, there may be a malfunction in the ECU.

    5. Inspect using an oscilloscope.
      1. Waveform 1
        WAVEFORM REFERENCE 1

        Terminal TXCT (D23-4) - AGND (D23-5)
        Tool Setting 5 V/DIV., 20 ms/DIV.
        Condition Ignition switch
        1: No key in ignition key cylinder → 2: Key inserted
        Fig 5: Waveform Graph 1
        G04830932Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2
        WAVEFORM REFERENCE 2

        Terminal CODE (D23-15) - AGND (D23-5)
        Tool Setting 5 V/DIV., 20 ms/DIV.
        Condition Ignition switch
        1: No key in ignition key cylinder → 2: Key inserted
        Fig 6: Waveform Graph 2
        G04830929Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Waveform 3
        WAVEFORM REFERENCE 3

        Terminal EFIO (D23-13) - EGND (D23-1)
        Tool Setting 10 V/DIV., 500 ms/DIV.
        Condition Ignition switch OFF → ON
        Fig 7: Waveform Graph 3
        G04830934Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Waveform 4
        WAVEFORM REFERENCE 4

        Terminal EFII (D23-12) - EGND (D23-11)
        Tool Setting 10 V/DIV., 500 ms/DIV.
        Condition Ignition switch OFF → ON
        Fig 8: Waveform Graph 4
        G04830935Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Measure the resistance between each pair of connector terminal.
      ECU TERMINAL REFERENCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (D23-5) - GND (D23-16) GR - W-B Amplifier ground circuit Always Below 1 Ω
      EGND (D23-11) - GND (D23-16) BR - W-B ECM ground circuit Always Below 1 Ω
  3. CHECK ECM 
    Fig 9: Identifying ECM Connector
    G04830936Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A21 ECM connector.
    2. Measure the voltage and resistance of the wire harness side connector.

      Standard 

      ECM TERMINAL REFERENCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IMI (A21-11) - EOM (A21-9) W - BR Transponder key ECU input signal No key in ignition key cylinder → Key inserted Pulse generation (see  1waveform 1)
      IMO (A21-10) - EOM (A21-9) O - BR Transponder key ECU output signal 1: No key in ignition key cylinder → 2: Key inserted Pulse generation (see  2waveform 2)
      EOM (A21-9) - 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.

    3. Reconnect the A21 ECU connector.
    4. Inspect using an oscilloscope.
      1. Waveform 1
        WAVEFORM REFERENCE 1

        Terminal IMI (A21-11) - EOM (A21-9)
        Tool Setting 10 V/DIV., 500 ms/DIV.
        Condition No key in ignition key cylinder → Key inserted
        Fig 10: Waveform Graph 1
        G04830934Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2
        WAVEFORM REFERENCE 2

        Terminal IMO (A21-10) - EOM (A21-9)
        Tool Setting 10 V/DIV., 500 ms/DIV.
        Condition No key in ignition key cylinder → Key inserted
        Fig 11: Waveform Graph 2
        G04830935Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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