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Terminals Of Ecu

  1. CHECK TRANSPONDER KEY AMPLIFIER 
    Fig 1: Identifying T12 Transponder Key Amplifier ECU Connector Terminals
    G05292494Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T12 amplifier connector.
    2. Measure the resistance of the wire harness side connector.
      ECU CONNECTOR TERMINAL SPECIFIED CONDITION RESISTANCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T12-5) - 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 T12 amplifier connector.
    4. Measure the resistance and voltage of the connector.
      ECU CONNECTOR TERMINAL SPECIFIED CONDITION RESISTANCE AND VOLTAGE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T12-5) - Body ground V - Body ground Ground Always Below 1 Ω
      +B (T12-1) - GND (T12-5) Y - V Power source No key in ignition key cylinder Below 1 V
      Key inserted 4.6 to 5.4 V
      CODE (T12-2) - GND (T12-5) V-W - V Modulated signal data output No key in ignition key cylinder Below 1 V
      Key inserted Pulse generation (see  e waveform 1)
      RXCK (T12-3) - GND (T12-5) R - V Synchronized clock output of FSK modulated signal data No key in ignition key cylinder Below 1 V
      Key inserted Pulse generation (see  f waveform 2)
      TXCT (T12-4) - GND (T12-5) G - V Burst signal control No key in ignition key cylinder Below 1 V
      Key inserted Pulse generation (see  g waveform 3)

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

    5. Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference) 

      WAVEFORM 1 REFERENCE CHART

      Item Content
      Symbols (Terminal No.) CODE (T12-2) - GND (T12-5)
      Tool Setting 5 V/DIV., 50 msec./DIV.
      Condition Key inserted
      Fig 2: Identifying Oscilloscope Waveform Graph 1
      G05292495Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference) 

      WAVEFORM 2 REFERENCE CHART

      Item Content
      Symbols (Terminal No.) RXCK (T12-3) - GND (T12-5)
      Tool Setting 5 V/DIV., 50 msec./DIV.
      Condition Key inserted
      Fig 3: Identifying Oscilloscope Waveform Graph 2
      G05292496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Using an oscilloscope, check waveform 3.

      Waveform 3 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Symbols (Terminal No.) TXCT (T12-4) - GND (T12-5)
      Tool Setting 2 V/DIV., 20 msec./DIV.
      Condition Key inserted
      Fig 4: Identifying Oscilloscope Waveform Graph 3
      G05292497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK TRANSPONDER KEY ECU 
    Fig 5: Identifying T13 Transponder Key Amplifier ECU Connector Terminals
    G05292498Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T13 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.
      ECU CONNECTOR TERMINAL SPECIFIED CONDITION RESISTANCE AND VOLTAGE

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

      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.
      ECU CONNECTOR TERMINAL SPECIFIED CONDITION VOLTAGE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      KSW (T13-3) - GND (T13-14) LG-B - W-B Unlock warning switch No key in ignition key cylinder 10 to 14 V
      Key inserted Below 1 V
      VC12 (T13-9) - AGND (T13-13) Y - V Power source Ignition switch OFF Below 1 V
      Ignition switch ON 10 to 14 V
      TXCT (T13-12) - AGND (T13-13) G - V Transponder key amplifier communication signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see  e waveform 1)
      CODE (T13-10)-AGND (T13-13) V-W - V No key in ignition key cylinder Below 1 V
      Key inserted Pulse generation (see  f waveform 2)
      RXCK (T13-11) - AGND (T13-13) R - V No key in ignition key cylinder Below 1 V
      Key inserted Pulse generation (see  g waveform 3)
      EFIO (T13-6) - GND (T13-14) L - W-B ECM output signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see  h waveform 4)
      EFII (T13-7) - GND (T13-14) LG - W-B ECM input signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see  i waveform 5)

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

    5. Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference) 

      WAVEFORM 1 REFERENCE CHART

      Item Content
      Symbols (Terminal No.) TXCT (T13-12) - AGND (T13-13)
      Tool Setting 2 V/DIV., 20 msec./DIV.
      Condition Key inserted
      Fig 6: Identifying Oscilloscope Waveform Graph 1
      G05292499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference) 

      WAVEFORM 2 REFERENCE CHART

      Item Content
      Symbols (Terminal No.) CODE (T13-10) - AGND (T13-13)
      Tool Setting 5 V/DIV., 50 msec./DIV.
      Condition Key inserted
      Fig 7: Identifying Oscilloscope Waveform Graph 2
      G05292500Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Using an oscilloscope, check waveform 3.

      Waveform 3 (Reference) 

      WAVEFORM 3 REFERENCE CHART

      Item Content
      Symbols (Terminal No.) RXCK (T13-11) - AGND (T13-13)
      Tool Setting 5 V/DIV., 50 msec./DIV.
      Condition Key inserted
      Fig 8: Identifying Oscilloscope Waveform Graph 3
      G05292501Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Using an oscilloscope, check waveform 4.

      Waveform 4 (Reference) 

      WAVEFORM 4 REFERENCE CHART

      Item Content
      Symbols (Terminal No.) EFIO (T13-6) - GND( T13-14)
      Tool Setting 2 V/DIV., 50 msec./DIV.
      Condition Key inserted
      Fig 9: Identifying Oscilloscope Waveform Graph 4
      G05292502Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. Using an oscilloscope, check waveform 5.

      Waveform 5 (Reference) 

      WAVEFORM 5 REFERENCE CHART

      Item Content
      Symbols (Terminal No.) EFII (T13-7) - GND (T13-14)
      Tool Setting 2 V/DIV., 50 msec./DIV.
      Condition Key inserted
      Fig 10: Identifying Oscilloscope Waveform Graph 5
      G05292503Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CHECK ECM 
    Fig 11: Identifying ECM Connector Terminals
    G05292504Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance and voltage of the connectors.
      ECU CONNECTOR TERMINAL SPECIFIED CONDITION RESISTANCE AND VOLTAGE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      E01 (E4-2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      IMI (E5-6) - E01 (E4-2) B-R - W-B Transponder key input signal No key in ignition key cylinder Below 1 V
      Key inserted Pulse generation (see  b waveform 1)
      IMO (E5-7) - E01 (E4-2) W-L - W-B Transponder key output signal No key in ignition key cylinder Below 1 V
      Key inserted Pulse generation (see  c waveform 2)

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

    2. Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference) 

      WAVEFORM 1 REFERENCE CHART

      Item Content
      Symbols (Terminal No.) IMI (E5-6) - E01 (E4-2)
      Tool Setting 2 V/DIV, 50 msec./DIV.
      Condition Key inserted
      Fig 12: Identifying Oscilloscope Waveform Graph 1
      G05292505Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference) 

      WAVEFORM 2 REFERENCE CHART

      Item Content
      Symbols (Terminal No.) IMO (E5-7) - E01 (E4-2)
      Tool Setting 2 V/DIV., 50 msec./DIV.
      Condition Key inserted
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