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Terminals Of Ecu

  1. CHECK TRANSPONDER KEY AMPLIFIER 
    Fig 1: Checking Transponder Key Amplifier
    G03071918Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T7 amplifier connector.
    2. Measure the resistance of the wire harness side connector.

      Standard: 

      TERMINALS SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T7-7) - 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 T7 amplifier connector.
    4. Measure the voltage of the connector.

      Standard: 

      TERMINALS SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      VC5 (T7-1) - GND (T7-7) L - V Power source No key in ignition key cylinder 0 V
      VC5 (T7-1) - GND (T7-7) L - V Power source Key inserted in ignition key cylinder 5 V
      CODE (T7-4) - GND (T7-7) Y - V Demodulated signal of transponder ID data No key in ignition key cylinder -> key inserted Pulse generation (see WAVEFORM 1 (REFERENCE) )
      TXCT (T7-5) - GND (T7-7) R - V Key code output signal No key in ignition key cylinder -> key inserted Pulse generation (see WAVEFORM 2 (REFERENCE) )

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

    5. Inspect using an oscilloscope.

      Waveform 1 (Reference): 

      WAVEFORM 1 (REFERENCE)

      Terminal CODE - GND
      Tool Setting 2 V/DIV., 20 ms/DIV.
      Condition No key in ignition key cylinder -> key inserted
      Fig 2: Identifying Waveform 1
      G03071919Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 2 (Reference): 

      WAVEFORM 2 (REFERENCE)

      Terminal TXCT - GND
      Tool Setting 2 V/DIV., 20 ms/DIV.
      Condition No key in ignition key cylinder -> key inserted
      Fig 3: Identifying Waveform 2
      G03071920Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK TRANSPONDER KEY ECU ASSY 
    Fig 4: Checking Transponder Key ECU Assy
    G03071921Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T8 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.

      Standard: 

      TERMINALS SPECIFICATION (1 OF 2)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B (T8-1) - GND (T8-14) G - BR-W Battery Always 10 to 14 V
      IG (T8-2) - GND (T8-14) LG - BR-W Ignition power supply Ignition switch OFF 0 V
      IG (T8-2) - GND (T8-14) LG - BR-W Ignition power supply Ignition switch ON 10 to 14 V
      KSW (T8-10) - GND (T8-14) B - BR-W Unlock warning switch No key in ignition key cylinder 10 kΩ or higher
      KSW (T8-10) - GND (T8-14) B - BR-W Unlock warning switch Key inserted in ignition key cylinder Below 1 Ω
      KSW (T8-10) - GND (T8-14) B - BR-W Unlock warning switch No key in ignition key cylinder 10 kΩ or higher
      KSW (T8-10) - GND (T8-14) B - BR-W Unlock warning switch Key inserted in ignition key cylinder Below 1 Ω
      AGND (T8-13) - GND (T8-14) V - BR-W Ground Always Below 1 Ω
      GND (T8-14) - Body ground BR-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.

    3. Reconnect the T8 ECU connector.
    4. Measure the voltage of the connector.

      Standard: 

      TERMINALS SPECIFICATION (2 OF 2)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      KSW (T8-10) - GND (T8-14) B - BR-W Unlock warning switch No key in ignition key cylinder 10 to 14 V
      KSW (T8-10) - GND (T8-14) B - BR-W Unlock warning switch Key inserted in ignition key cylinder Below 1 V
      VC5 (T8-8) - GND (T8-14) L - BR-W Power source of transponder key amplifier No key in ignition key cylinder 0 V
      VC5 (T8-8) - GND (T8-14) L - BR-W Power source of transponder key amplifier Key inserted in ignition key cylinder 5 V
      TXCT (T8-12) - AGND (T8-13) R - V Transponder key amplifier communication signal No key in ignition key cylinder -> key inserted Pulse generation (see WAVEFORM 1 (REFERENCE) )
      CODE (T8-11) - AGND (T8-13) Y - V Transponder key amplifier communication signal No key in ignition key cylinder -> key inserted Pulse generation (see WAVEFORM 2 (REFERENCE) )
      EFIO (T8-6) - GND (T8-14) O - BR-W ECM output signal Ignition switch OFF -> ON Pulse generation (see WAVEFORM 3 (REFERENCE) )
      EFII (T8-7) - GND (T8-14) GR - BR-W ECM input signal Ignition switch OFF -> ON Pulse generation (see WAVEFORM 4 (REFERENCE) )
      CTY (T8-4) - GND (T8-14) BR - BR-W Door courtesy switch Driver's door fully closed 10 to 14 V
      CTY (T8-4) - GND (T8-14) BR - BR-W Door courtesy switch Driver's door open Below 1 V
      IND (T8-3) - GND (T8-14) B - BR-W Security indicator lamp Engine immobilizer system is set (indicator is blinking) Alternating between 10 to 14 V (0.2 sec.) and 0 V (1.8 sec.)

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

    5. Inspect using an oscilloscope.

      Waveform 1 (Reference): 

      WAVEFORM 1 (REFERENCE)

      Terminal TXCT - GND
      Tool Setting 2 V/DIV., 10 ms/DIV.
      Condition No key in ignition key cylinder -> key inserted
      Fig 5: Identifying Waveform 1
      G03071922Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 2 (Reference): 

      WAVEFORM 2 (REFERENCE)

      Terminal CODE - GND
      Tool Setting 2 V/DIV., 20 ms/DIV.
      Condition No key in ignition key cylinder -> key inserted
      Fig 6: Identifying Waveform 2
      G03071923Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 3 (Reference): 

      WAVEFORM 3 (REFERENCE)

      Terminal EFIO - GND
      Tool Setting 10 V/DIV., 100 ms/DIV.
      Condition Ignition switch OFF -> ON
      Fig 7: Identifying Waveform 3
      G03071924Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 4 (Reference): 

      WAVEFORM 4 (REFERENCE)

      Terminal EFII - GND
      Tool Setting 10 V/DIV., 100 ms/DIV.
      Condition Ignition switch OFF -> ON
      Fig 8: Identifying Waveform 4
      G03071925Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CHECK ECM 
    Fig 9: Checking ECM
    G03071926Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage of the connectors.

      Standard: 

      TERMINALS SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      BATT (E4-3) - E1 (E6-1) V - L Battery Always 10 to 14 V
      +B (E4-1) - E1 (E6-1) B - L Ignition power supply Ignition switch ON 10 to 14 V
      IMO (E5-26) - EOM (E4-15) GR - W-B Transponder key ECU output signal Ignition switch ON Pulse generation (see WAVEFORM 1 (REFERENCE) )
      IMI (E5-27) - EOM (E4-15) O - W-B Transponder key ECU input signal Ignition switch ON Pulse generation (see WAVEFORM 2 (REFERENCE) )
      EOM (E4-15) - Body ground W-B - Body ground Ground Always Below 1 V
      E01 (E8-7) - Body ground B - Body ground Ground Always Below 1 V
      E02 (E8-6) - Body ground P - Body ground Ground Always Below 1 V
      E1 (E6-1) - Body ground L - Body ground Ground Always Below 1 V

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

    2. Inspect using an oscilloscope.

      Waveform 1 (Reference): 

      WAVEFORM 1 (REFERENCE)

      Terminal IMO - EOM
      Tool Setting 10 V/DIV., 100 ms/DIV.
      Condition Ignition switch ON
      Fig 10: Identifying Waveform 1
      G03071927Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 2 (Reference): 

      WAVEFORM 2 (REFERENCE)

      Terminal IMI - EOM
      Tool Setting 10 V/DIV., 100 ms/DIV.
      Condition Ignition switch ON
      Fig 11: Identifying Waveform 2
      G03071928Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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