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Terminals Of Ecu

WARNING: This page is about a different car, the 2008 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK TRANSPONDER KEY AMPLIFIER 
    Fig 1: Identifying T8 Connector Terminals
    G05273575Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T8 amplifier connector and measure the resistance between the terminal of the wire harness side connector and body ground.
      TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (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.
      TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      VC5 (T8-1) - AGND (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) - AGND (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) - AGND (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
      AGND (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 - AGND
        Tool Setting 5 V/DIV., 20 ms./DIV.
        Condition Key is in ignition key cylinder
        Fig 2: Identifying Oscilloscope Waveform 1
        G05140562Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference):
        WAVEFORM 2 REFERENCE

        Terminal TXCT-AGND
        Tool Setting 5 V/DIV., 20 ms./DIV.
        Condition Key is in ignition key cylinder
        Fig 3: Identifying Oscilloscope Waveform 2
        G05140563Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK TRANSPONDER KEY ECU ASSEMBLY 
    Fig 4: Identifying T9 Connector Terminals
    G05273578Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T9 ECU connector and measure the resistance and voltage between each terminal of the wire harness side connector.
      TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      CPUB (T9-1) - GND (T9-14) SB - W-B Battery Always 10 to 14 V
      IG2 (T9-2) - GND (T9-14) G - W-B Ignition switch Ignition switch OFF Below 1 V
      Ignition switch ON 10 to 14 V
      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

      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.
      TERMINAL DESCRIPTION

      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 ECM output signal Ignition switch OFF Below 1 V
      Ignition switch ON Waveform 3
      EFII (T9-7) - GND (T9-14) L - W-B ECM 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):
        WAVEFORM 1 REFERENCE

        Terminal TXCT - AGND
        Tool Setting 5 V/DIV., 20 ms./DIV.
        Condition Key is in ignition key cylinder
        Fig 5: Identifying Oscilloscope Waveform 1
        G05140563Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference):
        WAVEFORM 2 REFERENCE

        Terminal CODE - AGND
        Tool Setting 5 V/DIV., 20 ms./DIV.
        Condition Key is in ignition key cylinder
        Fig 6: Identifying Oscilloscope Waveform 2
        G05140562Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Waveform 3 (Reference):
        WAVEFORM 3 REFERENCE

        Terminal EFIO - GND
        Tool Setting 10 V/DIV., 500ms./DIV.
        Condition Ignition switch ON
        Fig 7: Identifying Oscilloscope Waveform 3
        G05273581Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Waveform 4 (Reference):
        WAVEFORM 4 REFERENCE

        Terminal EFN-GND
        Tool Setting 10 V/DIV., 500 ms./DIV.
        Condition Ignition switch ON
        Fig 8: Identifying Oscilloscope Waveform 4
        G05140568Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CHECK ECM 
    Fig 9: Identifying ECM Connector Terminals
    G05273583Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E7 ECM connector and measure the resistance between the terminal of the wire harness side connector and body ground.
      TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      E1 (E7-1) - 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 E7 ECM. Measure the voltage between each terminal of the connector according to the value(s) in the table below.
      TERMINAL DESCRIPTION TABLE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IMI (E6-16) - E1 (E7-1) GR - BR Transponder key ECU input signal Ignition switch OFF Below 1 V
      Ignition switch ON Waveform 1
      IMO (E6-15) - E1 (E7-1) 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 10 V/DIV., 500 ms./DIV.
        Condition Ignition switch ON
        Fig 10: Identifying Oscilloscope Waveform 1
        G05140567Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference):
        WAVEFORM 2 REFERENCE

        Terminal IMO - E1
        Tool Setting 10 V/DIV., 500 ms./DIV.
        Condition Ignition switch ON
        Fig 11: Identifying Oscilloscope Waveform 2
        G05140568Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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