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Terminals Of Ecu

  1. CHECK TRANSPONDER KEY AMPLIFIER 
    Fig 1: Identifying T9 Amplifier Connector
    G05236764Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T9 amplifier connector.
    2. Measure the resistance according to the value(s) in the table below.
      RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T9-7) - Body ground Y - 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 voltage and resistance according to the value(s) in the table below.
      RESISTANCE AND VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      VC5(T9-1)-GND(T9-7) G-R-Y Power source No key in ignition key cylinder → Key inserted 0 V → 4.6 to 5.4 V
      CODE (T9-4) - GND (T9-7) L-Y Demodulated signal of key code data No key in ignition key cylinder → Key inserted Pulse generation (see  1 waveform 1)
      TXCT (T9-5) - GND (T9-7) G-Y Key code output signal No key in ignition key cylinder → Key inserted Pulse generation (see  2 waveform 2)

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

    5. Inspect using an oscilloscope.
      1. Waveform 1 (Reference):
        WAVEFORM REFERENCE

        Terminal CODE - AGND
        Tool Setting 10V/DIV., 20ms/DIV.
        Condition No key in ignition key cylinder → Key inserted
        Fig 2: Waveform Graph
        G05195865Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference):
        WAVEFORM REFERENCE

        Terminal CODE - AGND
        Tool Setting 5V/DIV., 20ms/DIV.
        Condition No key in ignition key cylinder → Key inserted
        3. Fig 3: Waveform Graph
        G05195866Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK TRANSPONDER KEY ECU ASSEMBLY 
    Fig 4: Identifying T10 ECU Connector
    G05236767Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T10 ECU connector, and measure the voltage and resistance according to the value(s) in the table below.
      VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B(T10-1)-GND(T10-16) R-B - W-B Battery Always 10 to 14 V
      IG(T10-2)-GND(T10-16) B-W - W-B Ignition switch Ignition switch OFF → ON Below 1 V → 10 to 14 V
      GND (T10-16) - 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.

    2. Reconnect the T10 ECU connector, and measure the voltage according to the value(s) in the table below.
      VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      KSW (T10-3) - GND (T10-16) L-B - W-B Unlock warning switch No key in ignition key cylinder → Key inserted 10 to 14 V → Below 1 V
      TXCT (T10-4) - AGND (T10-5) G-Y Transponder key amplifier communication signal Ignition switch ON Waveform 1
      CTY (T10-7) - GND (T10-16) R-W - W-B Courtesy signal Driver side door is open → closed 10 to 14 V → Below 1 V
      IND(T10-8)-GND(T10-16) R-W - W-B Security indicator signal Engine immobilizer system SET → UNSET 3 to 5 V → Below 1 V
      D(T10-9)-GND(T10-16) L-R - W-B Diagnosis tester communication Ignition switch ON Pulse generation
      EFII(T10-12)-GND(T10-16) B-W-B ECM input signal Ignition switch ON Waveform 4
      EFIO (T10-13) - GND (T10-16) W-W-B ECM output signal Ignition switch ON Waveform 3
      VC5 (T10-14) - AGND (T10-5) GR-Y Power source Ignition switch OFF → ON Below 1 V → 4.6 to 5.4 V
      CODE (T10-15) - AGND (T10-5) L-Y Transponder key amplifier ground Ignition switch ON Waveform 2

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

    3. Inspect using an oscilloscope.
      1. Waveform 1 (Reference):
        WAVEFORM REFERENCE

        Terminal TXCT-AGND
        Tool Setting 5 V/DIV., 20 ms/DIV.
        Condition Ignition switch ON
        Fig 5: Waveform Graph
        G05195866Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference):
        WAVEFORM REFERENCE

        Terminal CODE - AGND
        Tool Setting 5 V/DIV, 20 ms/DIV.
        Condition Ignition switch ON
        Fig 6: Waveform Graph
        G05195865Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Waveform 3 (Reference):
        WAVEFORM REFERENCE

        Terminal EFIO - GND
        Tool Setting 10 V/DIV., 500 ms/DIV.
        Condition Ignition switch ON
        Fig 7: Waveform Graph
        G05195870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Waveform 4 (Reference):
        WAVEFORM REFERENCE

        Terminal EFII - GND
        Tool Setting 10 V/DIV, 500 ms/DIV.
        Condition Ignition switch ON
        Fig 8: Waveform Graph
        G05195871Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value(s) in the table below.
      RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (T10-5) - GND (T10-16) Y-W-B Amplifier ground circuit Always Below 1 Ω

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

  3. CHECK ECM 
    Fig 9: Identifying ECM Connectors
    G05195872Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance according to the value(s) in the table below.
      RESISTANCE AND VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IMI(E5-27)-EOM(E6-15) W-W-B Transponder key ECU output signal No key in ignition key cylinder → Key inserted Pulse generation (see  1 waveform 1)
      IMO(E5-26)-EOM(E6-15) B-W-B Transponder key ECU input signal No key in ignition key cylinder → Key inserted Pulse generation (see  2 waveform 2)
      EOM (E6-15) - 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.

    2. Inspect using an oscilloscope.
      1. Waveform 1 (Reference):
        WAVEFORM REFERENCE

        Terminal IMI - EOM
        Tool Setting 10V/DIV., 500ms/DIV.
        Condition No key in ignition key cylinder → Key inserted
        Fig 10: Waveform Graph
        G05195870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference):
        WAVEFORM REFERENCE

        Terminal IMO - EOM
        Tool Setting 10V/DIV., 500ms/DIV.
        Condition No key in ignition key cylinder → Key inserted
        Fig 11: Waveform Graph
        G05195871Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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