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Terminals Of Ecu

  1. CHECK TRANSPONDER KEY AMPLIFIER 
    1. Disconnect the T7 amplifier connector and measure the resistance between the terminal of the wire harness side connector and body ground.
      Fig 1: Identifying T7 Amplifier Connector Terminals
      G05242971Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      ECU TERMINAL DESCRIPTION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T7-7) - Body ground R - 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 T7 amplifier connector and measure the resistance and voltage of each terminal of the connector.
      ECU TERMINAL DESCRIPTION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      VC5 (T7-1) - GND (T7-7) B - R Power source No key is in ignition key cylinder Below 1 V
      Key is in ignition key cylinder 4.6 to 5.4 V
      CODE (T7-4) - GND (T7-7) GR - R Demodulated signal of key code date No key is in ignition key cylinder Below 1 V
      Key is in ignition key cylinder Waveform 1
      TXCT (T7-5) - GND (T7-7) SB - R Key code output signal No key is in ignition key cylinder Below 1 V
      Key is in ignition key cylinder Waveform2
      GND (T7-7) - Body ground R - Body ground Ground Always Below 1 Ω

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

    3. Inspect using an oscilloscope.
      1. Waveform 1 (Reference)
        Fig 2: Identifying Waveform Graph 1
        G05204101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        WAVEFORM REFERENCE

        Terminal CODE - GND
        Tool Setting 2 V/DIV., 20 ms/DIV.
        Condition Key is in ignition key cylinder
      2. Waveform 2 (Reference)
        Fig 3: Identifying Waveform Graph 2
        G05204102Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        WAVEFORM REFERENCE

        Terminal TXCT - GND
        Tool Setting 2 V/DIV., 10 ms/DIV.
        Condition Key is in ignition key cylinder
  2. CHECK TRANSPONDER KEY ECU ASSEMBLY 
    1. Disconnect the T14 ECU connector and measure the resistance and voltage between each terminal of the wire harness side connector.
      Fig 4: Identifying T14 ECU Connector Terminals
      G05242974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      ECU TERMINAL DESCRIPTION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T14-14) - Body ground W-B - Body ground Ground Always Below 1 Ω
      +B (T14-1) - GND (T14-14) LG - W-B Battery Always 10 to 14 V
      IG (T14-2) - GND (T14-14) P - W - B Ignition switch Ignition switch off Below 1 V
      Ignition switch on 10 to 14 V
      KSW (T14-10) - GND (T14-14) G - W - B Unlock warning switch No key is in ignition key cylinder 10 kΩ or higher
      Key is in ignition key cylinder Below 1 Ω

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

    2. Reconnect the T14 ECU connector and measure the voltage of each terminal of the connector.
      ECU TERMINAL DESCRIPTION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (T14-13) - Body ground R - Body ground Ground Always Below 1 Ω
      KSW (T14-10) - GND (T14-14) G - W-B Unlock warning switch No key is in ignition key cylinder 10 to 14 V
      Key is in ignition key cylinder Below 1 V
      VC5 (T14-8) - AGND (T14-13) B - R Power source No key is in ignition key cylinder Below 1 V
      Key is in ignition key cylinder 4.6 to 5.4 V
      TXCT (T14-12) - AGND (T14-13) SB - R Transponder key amplifier communication signal No key is in ignition key cylinder Below 1 V
      Key is in ignition key cylinder Waveform 1
      CODE (T14-11) - AGND (T14-13) GR - R Transponder key amplifier ground No key is in ignition key cylinder Below 1 V
      Key is in ignition key cylinder Waveform 2
      EFIO (T14-6) - GND (T14-14) O - W-B Hybrid vehicle control ECU output signal Ignition switch off Below 1 V
      Ignition switch on Waveform 3
      EFII (T14-7) - GND (T14-14) V - W-B Hybrid vehicle control ECU input signal Ignition switch off Below 1 V
      Ignition switch on Waveform 4
      D (T14-9) - GND (T14-14) V - W-B Diagnostic tester communication Without communication Below 1 V
      During communication Pulse generation
      CTY (T14-4) - GND (T14-14) B - W-B Door courtesy signal Switch pushed 10 to 14 V
      Switch free Below 1 V
      IND (T14-3) - GND (T14-14) W - W-B Security indicator signal Security indicator light comes on 10 to 14 V
      Security indicator light goes off Below 1 V

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

    3. Inspect using an oscilloscope.
      1. Waveform 1 (Reference)
        Fig 5: Identifying Waveform Graph 1
        G05204102Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        WAVEFORM REFERENCE

        Terminal TXCT - AGND
        Tool Setting 2 V/DIV., 10 ms/DIV
        Condition Key is in ignition key cylinder
      2. Waveform 2 (Reference)
        Fig 6: Identifying Waveform Graph 2
        G05204101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        WAVEFORM REFERENCE

        Terminal CODE - AGND
        Tool Setting 2 V/DIV., 20 ms/DIV
        Condition Key is in ignition key cylinder
      3. Waveform 3 (Reference)
        Fig 7: Identifying Waveform Graph 3
        G05204106Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        WAVEFORM REFERENCE

        Terminal EFIO-GND
        Tool Setting 2 V/DIV., 1 s/DIV
        Condition Ignition switch on
      4. Waveform 4 (Reference)
        WAVEFORM REFERENCE

        Terminal EFII - GND
        Tool Setting 2 V/DIV., 200 ms/DIV
        Condition Ignition switch on
  3. CHECK HYBRID VEHICLE CONTROL ECU 
    1. Disconnect the H14 hybrid vehicle control ECU connector and measure the resistance between the terminal of the wire harness side connector and body ground.
      Fig 8: Identifying Waveform Graph 4
      G05204107Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 9: Identifying Hybrid Vehicle Control ECU Connector Terminals
      G05204108Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      ECU TERMINAL DESCRIPTION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      E1 (H14-5) - 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 H14 hybrid vehicle control ECU connector. Measure the voltage between each terminal of the connector according to the value(s9 in the table below.
      ECU TERMINAL DESCRIPTION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IMI (H12-22) - E1 (H14-5) O - W-B Transponder key ECU input signal Ignition switch off Below 1 V
      Ignition switch on Waveform 1
      IMO (H12-28) - E1 (H14-5) V - W-B Transponder key ECU output signal Ignition switch off Below 1 V
      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)
        Fig 10: Identifying Waveform Graph (1)
        G05204106Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        WAVEFORM REFERENCE

        Terminal IMI - E1
        Tool Setting 2 V/DIV., 1 s/DIV.
        Condition Ignition switch on
      2. Waveform 2 (Reference)
        Fig 11: Identifying Waveform Graph (2)
        G05204107Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        WAVEFORM REFERENCE

        Terminal IMO - E1
        Tool Setting 2 V/DIV., 200 ms/DIV.
        Condition Ignition switch on
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