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Terminals Of Ecu

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  1. CHECK TRANSPONDER KEY AMPLIFIER 
    1. Disconnect the T8 amplifier connector and measure the resistance between the terminal of the wire harness side connector and body ground.
      Fig 1: Identifying Transponder Key Amplifier Terminal Connector
      G04114747Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TRANSPONDER KEY AMPLIFIER (DISCONNECT)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T8-7) - Body ground W - 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 T8 amplifier connector and measure the resistance and voltage of each terminal of the connector.
      TRANSPONDER KEY AMPLIFIER (RECONNECT)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      VC5 (T8-1) - GND (T8-7) P - W 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 (T8-4) - GND (T8-7) LG - W 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 (T8-5) - GND (T8-7) BR - W Key code output signal No key is in ignition key cylinder Below 1 V
      Key is in ignition key cylinder Waveform 2
      GND (T8-7) - Body ground W - 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):
        WAVEFORM 1 REFERENCE

        Terminal CODE - GND
        Tool Setting 2 V/DIV., 20 ms/DIV.
        Condition Key is in ignition key cylinder
        Fig 2: Identifying Waveform 1
        G04114748Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference):
        WAVEFORM 2 REFERENCE

        Terminal TXCT - GND
        Tool Setting 2 V/DIV., 10 ms/DIV.
        Condition Key is in ignition key cylinder
        Fig 3: Identifying Waveform 2
        G04114749Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK TRANSPONDER KEY ECU ASSEMBLY 
    1. Disconnect the T9 ECU connector and measure the resistance and voltage between each terminal of the wire harness side connector.
      Fig 4: Identifying Transponder Key ECU Terminal Connector
      G04114750Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TRANSPONDER KEY ECU ASSEMBLY (DISCONNECT) (1 OF 2)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      CPUB (T9-1) - GND (T9-14) V - W-B Battery Always 10 to 14 V
      IG2 (T9-2) - GND (T9-14) V - W-B Ignition switch Ignition switch off Below 1 V
      Ignition switch on 10 to 14 V
      TRANSPONDER KEY ECU ASSEMBLY (DISCONNECT) (2 OF 2)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      KSW (T9-3) - GND (T9-14) B - 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
      MPX1 (T9-4) - Body ground O - Body ground MPX line Always 10 kΩ or higher
      MPX2 (T9-5) - Body ground R - Body ground MPX line Always 10 kΩ or higher

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

    2. Reconnect the T9 ECU connector and measure the voltage of each terminal of the connector.
      TRANSPONDER KEY ECU ASSEMBLY (RECONNECT)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (T9-13) - Body ground W - Body ground Ground Always Below 1 Ω
      KSW (T9-3) - GND (T9-14) B - 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 (T9-9) - AGND (T9-13) P - W Power source Ignition switch off Below 1 V
      Ignition switch on 4.6 to 5.4 V
      TXCT (T9-12) - AGND (T9-13) BR - W Transponder key amplifier communication signal No key is in ignition key cylinder Below 1 V
      Key is in ignition key cylinder Waveform 1
      CODE (T9-10) - AGND (T9-13) LG - W Transponder key amplifier ground No key is in ignition key cylinder Below 1 V
      Key is in ignition key cylinder Waveform 2
      EFIO (T9-6) - GND (T9-14) GR - W-B Hybrid vehicle control ECU output signal Ignition switch off Below 1 V
      Ignition switch on Waveform 3
      EFII (T9-7) - GND (T9-14) L - W-B Hybrid vehicle control ECU input signal Ignition switch off Below 1 V
      Ignition switch on Waveform 4

      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 1
        G04114751Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        WAVEFORM 1 REFERENCE

        Terminal TXCT - AGND
        Tool Setting 2 V/DIV., 10 ms/DIV.
        Condition Key is in ignition key cylinder
      2. Waveform 2 (Reference):
        WAVEFORM 2 REFERENCE

        Terminal CODE - AGND
        Tool Setting 2 V/DIV., 20 ms/DIV.
        Condition Key is in ignition key cylinder
        Fig 6: Identifying Waveform 2
        G04114752Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Waveform 3 (Reference):
        WAVEFORM 3 REFERENCE

        Terminal EFIO - AGND
        Tool Setting 2 V/DIV., 1 ms/DIV.
        Condition Ignition switch on
        Fig 7: Identifying Waveform 3
        G04114753Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Waveform 4 (Reference):
        WAVEFORM 4 REFERENCE

        Terminal EFII - AGND
        Tool Setting 2 V/DIV., 200 ms/DIV.
        Condition Ignition switch on
        Fig 8: Identifying Waveform 4
        G04114754Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CHECK HYBRID VEHICLE CONTROL ECU 
    1. Disconnect the H31 hybrid vehicle control ECU connector and measure the resistance between the terminal of the wire harness side connector and body ground.
      Fig 9: Identifying Hybrid Vehicle Control ECU Terminal Connectors
      G04114755Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      HYBRID VEHICLE CONTROL ECU (DISCONNECT)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      E1 (H31-5) - 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.

    2. Reconnect the H31 hybrid vehicle control ECU. Measure the voltage between each terminal of the connector according to the value(s) in the table below.
      HYBRID VEHICLE CONTROL ECU (RECONNECT)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IMI (H29-22) - E1 (H31-5) GR - BR Transponder key ECU input signal Ignition switch off Below 1 V
      Ignition switch on Waveform 1
      IMO (H29-28) - E1 (H31-5) L- BR Transponder key ECU output signal Ignition switch off Below 1 V
      Ignition switch on Waveform 2

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

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

        Terminal IMI - E1
        Tool Setting 2 V/DIV., 1 ms/DIV.
        Condition Ignition switch on
        Fig 10: Identifying Waveform 1
        G04114756Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference):
        WAVEFORM 2 REFERENCE

        Terminal IMO - E1
        Tool Setting 2 V/DIV., 200 ms/DIV.
        Condition Ignition switch on
        Fig 11: Identifying Waveform 2
        G04114757Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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