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Terminals Of Ecu

WARNING: This page is about a different car, the 2007 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK TRANSPONDER KEY AMPLIFIER 
    Fig 1: Checking Transponder Key Amplifier
    G04412359Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T9 amplifier connector.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance: 

      TRANSPONDER KEY AMPLIFIER (RESISTANCE)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (T9-7) - Body ground L - 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 resistance and voltage of the connector.

      Standard: 

      TRANSPONDER KEY AMPLIFIER (RESISTANCE AND VOLTAGE)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      VC5 (T9-1) - AGND (T9-7) GR-B - L Power source No key in ignition key cylinder 0 V
      VC5 (T9-1) - AGND (T9-7) GR-B - L Power source Key inserted 4.6 to 5.4 V
      CODE (T9-4) - AGND (T9-7) P-G - L Demodulated signal of key code data No key in ignition key cylinder -> Key inserted Pulse generation (see WAVEFORM 1 )
      TXCT (T9-5) - AGND (T9-7) LG-R - L Key code output signal No key in ignition key cylinder -> Key inserted Pulse generation (see WAVEFORM 2 )
      AGND (T9-7) - Body ground L - Body ground Ground Always Below 1 Ω

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

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

        Terminal CODE (T9-4) - AGND (T9-7)
        Tool Setting 2 V/DIV., 20 msec/DIV.
        Condition No key in ignition key cylinder -> Key inserted
        Fig 2: Identifying Waveform 1 Blinking Pattern
        G04412360Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2
        WAVEFORM 2

        Terminal TXCT (T9-5) - AGND (T9-7)
        Tool Setting 2 V/DIV., 20 msec/DIV.
        Condition No key in ignition key cylinder -> Key inserted
        Fig 3: Identifying Reference Waveform Pattern
        G04021428Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK TRANSPONDER KEY ECU ASSEMBLY 
    Fig 4: Checking Transponder Key ECU Assembly
    G04412362Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T10 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.

      Standard: 

      TRANSPONDER KEY ECU ASSEMBLY (RESISTANCE AND VOLTAGE)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T10-16) - Body ground W-B - Body ground Ground Always Below 1 Ω
      +B (T10-1) - GND (T10-16) R - W-B Battery Always 10 to 14 V
      IG (T10-2) - GND (T10-16) O - W-B Ignition switch Ignition switch OFF 0 V
      IG (T10-2) - GND (T10-16) O - W-B Ignition switch Ignition switch ON 10 to 14 V
      KSW (T10-3) - AGND (T10-5) G-B - L Unlock warning switch No key in ignition key cylinder 10 kΩ or higher
      KSW (T10-3) - AGND (T10-5) G-B - L Unlock warning switch Key inserted Below 1Ω

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

    3. Reconnect the T10 ECU connector.
    4. Measure the voltage of the connector.

      Standard voltage: 

      TRANSPONDER KEY ECU ASSEMBLY (VOLTAGE)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      VC5 (T10-14) - GND (T10-16) GR-B - W-B Power source No key in ignition key cylinder 0 V
      VC5 (T10-14) - GND (T10-16) GR-B - W-B Power source Key inserted 4.6 to 5.4 V
      TXCT (T10-4) - GND (T10-16) LG-R - W-B Transponder key amplifier communication signal No key in ignition key cylinder -> Key inserted Pulse generation (see WAVEFORM 1 )
      CODE (T10-15) - GND (T10-16) P-G - W-B Transponder key amplifier communication signal No key in ignition key cylinder -> Key inserted Pulse generation (see WAVEFORM 2 )
      EFIO (T10-13) - GND (T10-16) L-W - W-B ECM output signal Ignition switch OFF -> ON Pulse generation (see WAVEFORM 3 )
      EFII (T10-12) - GND (T10-16) LG-B - W-B ECM input signal Ignition switch OFF -> ON Pulse generation (see WAVEFORM 4 )

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

    5. Inspect using an oscilloscope.
      1. Waveform 1
        WAVEFORM F1

        Terminal TXCT (T10-4) - GND (T10-16)
        Tool Setting 2.5 V/DIV., 20 msec/DIV.
        Condition No key in ignition key cylinder -> Key inserted
        Fig 5: Identifying Waveform 1 Blinking Pattern
        G04412363Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference)
        WAVEFORM 2

        Terminal CODE (T10-15) - GND (T10-16)
        Tool Setting 2.5 V/DIV., 20 msec/DIV.
        Condition No key in ignition key cylinder -> Key inserted
        Fig 6: Identifying Waveform 2 Blinking Pattern
        G04412364Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Waveform 3
        WAVEFORM 3

        Terminal EFIO (T10--13) - GND (T10--16)
        Tool Setting 12 V/DIV., 100 msec/DIV.
        Condition Ignition switch OFF -> ON
        Fig 7: Identifying Reference Waveform
        G04021438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Waveform 4
        WAVEFORM 4

        Terminal EFII (T10-12) - GND (T10-16)
        Tool Setting 10 V/DIV., 100 msec/DIV.
        Condition Ignition switch OFF -> ON
        Fig 8: Identifying Reference Waveform Pattern
        G04021433Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CHECK ECM (2TR-FE) 
    Fig 9: Checking ECM (2TR-FE)
    G04412367Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E7 and E8 ECM connectors.
    2. Measure the resistance and voltage of the wire harness side connector.

      Standard: 

      ECM (2TR-FE)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IMI (E7-16) - EOM (E8-29) L-W - W-B Transponder key ECU input signal Ignition switch OFF - ON Pulse generation (see WAVEFORM 1 )
      IMO (E7-15) - EOM (E8-29) LG-B - W-B Transponder key ECU output signal Ignition switch OFF -> ON Pulse generation (see WAVEFORM 2 )
      EOM (E8-29) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Inspect using an oscilloscope.
      1. Waveform 1
        WAVEFORM 1

        Terminal IMI (E7-16) - EOM (E8-29)
        Tool Setting 12 V/DIV., 100 msec/DIV.
        Condition Ignition switch OFF -> ON
        Fig 10: Identifying Reference Waveform
        G04021438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2
        WAVEFORM 2

        Terminal IMO (E7-15) - EOM (E8-29)
        Tool Setting 10 V/DIV., 100 msec/DIV.
        Condition Ignition switch OFF -> ON
        Fig 11: Identifying Reference Waveform Pattern
        G04021433Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CHECK ECM (1GR-FE) 
    Fig 12: Checking ECM (1GR-FE)
    G04412370Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E7 ECM connectors.
    2. Measure the resistance and voltage of the wire harness side connector.

      Standard: 

      ECM (1GR-FE)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IMI (E7-16) - EOM (E7-35) L-W - W-B Transponder key ECU input signal Ignition switch OFF -> ON Pulse generation (see WAVEFORM 1 )
      IMO (E7-15) - EOM (E7-35) LG-B - W-B Transponder key ECU output signal Ignition switch OFF -> ON Pulse generation (see WAVEFORM 2 )
      EOM (E7-35) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Inspect using an oscilloscope.
      1. Waveform 1
        WAVEFORM 1

        Terminal IMI (E7-16) - EOM (E7-35)
        Tool Setting 12 V/DIV., 100 msec/DIV.
        Condition Ignition switch OFF -> ON
        Fig 13: Identifying Reference Waveform
        G04021438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2
        WAVEFORM 2

        Terminal IMO (E7-15) - EOM (E7-35)
        Tool Setting 10 V/DIV., 100 msec/DIV.
        Condition Ignition switch OFF -> ON
        Fig 14: Identifying Reference Waveform Pattern
        G04021433Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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