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Terminals Of Ecu

  1. CHECK TRANSPONDER KEY AMPLIFIER 
    Fig 1: Identifying T12 Amplifier Connector Terminal
    G02957027Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T12 amplifier connector.
    2. Measure the resistance of the wire harness side connector.

      Standard: 

      TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T12-5) - Body ground V - Body ground Ground Always Below 1 ohms

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

    3. Reconnect the T12 amplifier connector.
    4. Measure the voltage and resistance of the connector.

      Standard: 

      TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B (T12-1) - GND (T12-5) Y - V Power source No key in ignition key cylinder 0 V
      +B (T12-1) - GND (T12-5) Y - V Power source Key inserted 4.6 to 5.4 V
      CODE (T12-2) - GND (T12-5) V-W - V Demodulated signal of key code data No key in ignition key cylinder 0 V
      CODE (T12-2) - GND (T12-5) V-W - V Demodulated signal of key code data Key inserted Pulse generation (see Fig 2)
      TXCT (T12-4) - GND (T12-5) G - V Key code output signal No key in ignition key cylinder 0 V
      TXCT (T12-4) - GND (T12-5) G - V Key code output signal Key inserted Pulse generation (see Fig 3)
      GND (T12-5) - Body ground V - Body ground Ground Always Below 1 ohms

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

    5. Inspect using an oscilloscope.

      Waveform 1 (Reference): 

      WAVEFORM REFERENCE - 1

      Symbols (Terminal No.) CODE (T12-2) - GND (T12-5)
      Tool Setting 10 V/DIV., 20 m sec./DIV.
      Condition Key inserted
      Fig 2: Identifying Waveform 1
      G02957028Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 2 (Reference): 

      WAVEFORM REFERENCE - 1

      Symbols (Terminal No.) TXCT (T12-4) - GND (T12-5)
      Tool Setting 5 V/DIV., 20 msec./DIV.
      Condition Key inserted
      Fig 3: Identifying Waveform 2
      G02957029Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK TRANSPONDER KEY ECU ASSY 
    1. Disconnect the T13 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.

      Standard: 

      Fig 4: Identifying T13 ECU Connector Terminal
      G02957030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (T13-13) - Body ground V - Body ground Ground Always Below 1 ohms
      CPUB (T13-1) - GND (T13-14) L-O - W-B Battery Always 10 to 14 V
      IG2 (T13-2) - AGND (T13-13) G-B - V Ignition power supply Ignition switch OFF 0 V
      IG2 (T13-2) - AGND (T13-13) G-B - V Ignition power supply Ignition switch ON 10 to 14 V
      KSW (T13-3) - AGND (T13-13) LG-B - V Unlock warning switch No key in ignition key cylinder 10 k ohms or higher
      KSW (T13-3) - AGND (T13-13) LG-B - V Unlock warning switch Key inserted Below 1 ohms

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

    3. Reconnect the T13 ECU connector.
    4. Measure the voltage of the connector.

      Standard: 

      TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      KSW (T13-3) - AGND (T13-13) LG-B - V Unlock warning switch No key in ignition key cylinder 10 to 14 V
      KSW (T13-3) - AGND (T13-13) LG-B - V Unlock warning switch Key inserted 0 V
      VC12 (T13-9) - AGND (T13-13) Y - V Power source Ignition switch OFF 0 V
      VC12 (T13-9) - AGND (T13-13) Y - V Power source Ignition switch ON 4.6 to 5.4 V
      TXCT (T13-12) - AGND (T13-13) G - V Transponder key amplifier communication signal Ignition switch OFF 0 V
      TXCT (T13-12) - AGND (T13-13) G - V Transponder key amplifier communication signal Ignition switch ON Pulse generation (see Fig 5)
      CODE (T13-10) - AGND (T13-13) V-W - V Transponder key amplifier communication signal Ignition switch OFF 0 V
      CODE (T13-10) - AGND (T13-13) V-W - V Transponder key amplifier communication signal Ignition switch ON Pulse generation (see Fig 6)
      EFIO (T13-6) - AGND (T13-13) B-R - V ECM output signal Ignition switch OFF 0 V
      EFIO (T13-6) - AGND (T13-13) B-R - V ECM output signal Ignition switch ON Pulse generation (see Fig 7)
      EFII (T13-7) - AGND (T13-13) W-L - V ECM input signal Ignition switch OFF 0 V
      EFII (T13-7) - AGND (T13-13) W-L - V ECM input signal Ignition switch ON Pulse generation (see Fig 8)

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

    5. Inspect using an oscilloscope.

    Waveform 1 (Reference): 

    WAVEFORM REFERENCE - 1

    Symbols (Terminal No.) TXCT (T13-12) - AGND (T13-13)
    Tool Setting 5 V/DIV., 20 msec./DIV.
    Condition Ignition switch ON
    Fig 5: Identifying Waveform 1
    G02957031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Waveform 2 (Reference): 

    WAVEFORM REFERENCE - 2

    Symbols (Terminal No.) CODE (T13-10) - AGND (T13-13)
    Tool Setting 10 V/DIV., 20 msec./DIV.
    Condition Ignition switch ON
    Fig 6: Identifying Waveform 2
    G02957032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Waveform 3 (Reference): 

    WAVEFORM REFERENCE - 3

    Symbols (Terminal No.) EFIO (T13-6) - AGND (T13-13)
    Tool Setting 10 V/DIV., 500 msec./DIV.
    Condition Ignition switch ON
    Fig 7: Identifying Waveform 3
    G02957033Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Waveform 4 (Reference): 

    WAVEFORM REFERENCE - 4

    Symbols (Terminal No.) EFII (T13-7) - AGND (T13-13)
    Tool Setting 10 V/DIV., 500 msec./DIV.
    Condition Ignition switch ON
    Fig 8: Identifying Waveform 4
    G02957034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CHECK ECM 
    Fig 9: Identifying ECM Connector Terminal
    G02957035Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance of the connectors.

      Standard: 

      TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IMI (E5-24) - E01 (E4-2) B-R - W-B Transponder key ECU input signal No key in ignition key cylinder 0 V
      IMI (E5-24) - E01 (E4-2) B-R - W-B Transponder key ECU input signal Key inserted Pulse generation (see Fig 10)
      IMO (E5-23) - E01 (E4-2) W-L - W-B Transponder key ECU output signal No key in ignition key cylinder 0 V
      IMO (E5-23) - E01 (E4-2) W-L - W-B Transponder key ECU output signal Key inserted Pulse generation (see Fig 11)
      E01 (E4-2) - Body ground W-B - Body ground Ground Always Below 1 ohms

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

    2. Inspect using an oscilloscope.

      Waveform 1 (Reference): 

      WAVEFORM REFERENCE - 1

      Symbols (Terminal No.) IMI (E5-24) - E01 (E4-2)
      Tool Setting 10 V/DIV., 500 msec./DIV.
      Condition Key inserted
      Fig 10: Identifying Waveform 1
      G02957036Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 2 (Reference): 

      WAVEFORM REFERENCE - 2

      Symbols (Terminal No.) IMO (E5-23) - E01 (E4-2)
      Tool Setting 10 V/DIV., 500 msec./DIV.
      Condition Key inserted
      Fig 11: Identifying Waveform 2
      G02957037Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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