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Terminals Of Ecu

  1. CHECK TRANSPONDER KEY AMPLIFIER 
    Fig 1: Checking Transponder Key Amplifier
    G03003056Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T8 amplifier connector.
    2. Measure the resistance of the wire harness side connector.

      Standard: 

      TRANSPONDER KEY AMPLIFIER - RESISTANCE TABLE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T8-7) - Body ground V - 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 T8 amplifier connector.
    4. Measure the voltage and resistance of the connector.

      Standard: 

      TRANSPONDER KEY AMPLIFIER - VOLTAGE TABLE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      VC5 (T8-1) - GND (T8-7) R - V Power source No key in ignition key cylinder -> Key inserted 0 V -> 4.6 to 5.4 V
      RXCK (T8-3) - GND (T8-7) L - V Demodulated signal of key code data No key in ignition key cylinder -> Key inserted Pulse generation (see waveform 1)
      CODE (T8-4) - GND (T8-7) O - V Demodulated signal of key code data No key in ignition key cylinder -> Key inserted Pulse generation (see waveform 2)
      TXCT (T8-5) - GND (T8-7) Y-B - V Key code output signal No key in ignition key cylinder -> Key inserted Pulse generation (see waveform 3)
      GND (T8-7) - Body ground V - Body ground Ground Always Below 1 Ω

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

    5. Inspect using an oscilloscope.

    Waveform 1 (Reference): 

    WAVEFORM 1 REFERENCE TABLE

    Terminal RXCK - GND
    Tool Setting 5 V/DIV., 50 ms/DIV.
    Condition No key in ignition key cylinder -> Key inserted
    Fig 2: Identifying Waveform 1
    G03003057Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Waveform 2 (Reference): 

    WAVEFORM 2 REFERENCE TABLE

    Terminal CODE - GND
    Tool Setting 10 V/DIV., 20ms/DIV.
    Condition No key in ignition key cylinder -> Key inserted
    Fig 3: Identifying Waveform 2
    G03003058Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Waveform 3 (Reference): 

    WAVEFORM 3 REFERENCE TABLE

    Terminal TXCT - GND
    Tool Setting 5 V/DIV., 20ms/DIV.
    Condition No key in ignition key cylinder -> Key inserted
    Fig 4: Identifying Waveform 3
    G03003059Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK STEERING LOCK ECU 
    Fig 5: Checking Steering Lock ECU
    G03003060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the S46 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.

      Standard: 

      STEERING LOCK ECU - VOLTAGE TABLE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (S46-18) - Body ground V - Body ground Ground Always Below 1 Ω
      CPUB (S46-1) - GND (S46-9) V-Y - W-B Battery Always 10 to 14 V
      IG2 (S46-2) - AGND (S46-18) B - V Ignition switch Ignition switch OFF -> ON OV -> 10 to 14 V
      KSW (S46-12) - AGND (S46-18) LG-B - V Unlock warning switch No key in ignition key cylinder -> Key inserted 10 kΩ or higher -> Below 1 Ω
      PUSH (S46-11) - AGND (S46-18) P-B - V Ignition switch push signal Ignition switch not pushed -> pushed 10 kΩ or higher -> Below 1 Ω

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

    3. Reconnect the S46 ECU connector.
    4. Measure the voltage of the connector.

      Standard: 

      STEERING LOCK ECU - VOLTAGE TABLE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      KSW (S46-12) - AGND (S46-18) LG-B - V Unlock warning switch No key in ignition key cylinder -> Key inserted 10 to 14 V -> 0 V
      VC5 (S46-7) - AGND (S46-18) R - V Power source Ignition switch OFF -> ON 0 V -> 4.6 to 5.4 V
      RXCK (S46-8) - AGND (S46-18) L - V Transponder key amplifier communication signal Ignition switch OFF -> ON Pulse generation (see waveform 1)
      TXCT (S46-16) - AGND (S46-18) Y-B - V Transponder key amplifier communication signal Ignition switch OFF -> ON Pulse generation (see waveform 2)
      CODE (S46-17) - AGND (S46-18) O - V Transponder key amplifier communication signal Ignition switch OFF -> ON Pulse generation (see waveform 3)
      EFIO (S46-13) - AGND (S46-18) B-Y - V ECM output signal Ignition switch OFF -> ON Pulse generation (see waveform 4)
      EFII (S46-4) - AGND (S46-18) GR-R - V ECM input signal Ignition switch OFF -> ON Pulse generation (see waveform 5)

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

    5. Inspect using an oscilloscope.

      Waveform 1 (Reference): 

      WAVEFORM 1 REFERENCE TABLE

      Terminal RXCK - GND
      Tool Setting 5 V/DIV., 10 ms/DIV.
      Condition Ignition switch OFF -> ON
      Fig 6: Identifying Waveform 1
      G03003061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 2 (Reference): 

      WAVEFORM 2 REFERENCE TABLE

      Terminal TXCT - GND
      Tool Setting 5 V/DIV., 20ms/DIV.
      Condition Ignition switch OFF -> ON
      Fig 7: Identifying Waveform 2
      G03003062Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 3 (Reference): 

      WAVEFORM 3 REFERENCE TABLE

      Terminal CODE - GND
      Tool Setting 10 V/DIV., 20 ms/DIV.
      Condition Ignition switch OFF -> ON
      Fig 8: Identifying Waveform 3
      G03003063Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 4 (Reference): 

      WAVEFORM 4 REFERENCE TABLE

      Terminal EFIO - GND
      Tool Setting 10 V/DIV., 500 ms/DIV.
      Condition Ignition switch OFF -> ON
      Fig 9: Identifying Waveform 4
      G03003064Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 5 (Reference): 

      WAVEFORM 5 REFERENCE TABLE

      Terminal EFII - GND
      Tool Setting 10 V/DIV., 500 ms/DIV.
      Condition Ignition switch OFF -> ON
      Fig 10: Identifying Waveform 5
      G03003065Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CHECK ECM 
    Fig 11: Checking ECM
    G03003066Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E2 and E4 ECM connectors.
    2. Measure the voltage and resistance of the wire harness side connectors.

      Standard: 

      ECM CONNECTORS - VOLTAGE AND RESISTANCE TABLE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IMI (E2-6) - E01 (E4-2) GR-G - W-B Steering lock ECU input signal No key in ignition key cylinder -> Key inserted Pulse generation (see waveform 1)
      IMO (E2-7) - E01 (E4-2) GR-R - W-B Steering lock ECU output signal No key in ignition key cylinder -> Key inserted Pulse generation (see waveform 2)
      E01 (E4-2) - 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.

    3. Inspect using an oscilloscope.

    Waveform 1 (Reference): 

    WAVEFORM 1 REFERENCE TABLE

    Terminal IMI - GND
    Tool Setting 10 V/DIV., 500 ms/DIV.
    Condition No key in ignition key cylinder -> Key inserted
    Fig 12: Identifying Waveform 1
    G03003067Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Waveform 2 (Reference): 

    WAVEFORM 2 REFERENCE TABLE

    Terminal IMO - GND
    Tool Setting 10 V/DIV., 500 ms/DIV.
    Condition No key in ignition key cylinder -> Key inserted
    Fig 13: Identifying Waveform 2
    G03003068Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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