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Ecu Connector Terminal Identification

  1. CHECK TRANSPONDER KEY AMPLIFIER 
    Fig 1: Identifying D32 Connector Terminals
    G05005490Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the D32 amplifier connector.
    2. Measure the resistance between the terminal of the wire harness side connector and body ground.
      RESISTANCE SPECIFICATIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (D32-7) - 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 D32 amplifier connector.
    4. Measure the voltage of the connector.
      VOLTAGE SPECIFICATIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      VC5 (D32-1) - AGND (D32-7) W-V Power source No key in ignition key cylinder → Key inserted 0 V → 4.6 to 5.4 V
      CODE (D32-4) - AGND (D32-7) LG-V Demodulated signal of key code data No key in ignition key cylinder → Key inserted Pulse generation (see  1 waveform 1)
      TXCT (D32-5) - AGND (D32-7) BR-V 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 1 (REFERENCE)

        Terminal CODE - AGND
        Tool Setting 10 V/DIV., 20 ms/DIV.
        Condition No key in ignition key cylinder → Key inserted
        Fig 2: Waveform 1 Reference Graph
        G05005491Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference):
        WAVEFORM 2 (REFERENCE)

        Terminal TXCT-AGND
        Tool Setting 5 V/DIV., 20 ms/DIV.
        Condition No key in ignition key cylinder → Key inserted
  2. CHECK TRANSPONDER KEY ECU ASSEMBLY 
    Fig 3: Waveform 2 Reference Graph
    G05407216Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Identifying D33 ECU Connector Terminals
    G05005493Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the D33 ECU connector, and measure the voltage and resistance between each terminal of the wire harness side connector.
      RESISTANCE SPECIFICATIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B (D33-1) - GND (D33-16) Y - W-B Battery Always 10 to 14 V
      IG (D33-2) - AGND (D33-5) G-V Ignition switch Ignition switch OFF → ON Below 1 V → 10 to 14 V
      GND (D33-16) - 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 D33 ECU connector, and measure the voltage between each terminal of the connector.
      VOLTAGE SPECIFICATIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      KSW (D33-3) - GND (D33-16) B - W-B Unlock warning switch No key in ignition key cylinder → Key inserted 10 to 14 V → Below 1 V
      TXCT (D33-4) - AGND (D33-5) BR-V Transponder key amplifier communication signal Ignition switch ON Waveform 1
      CTY (D33-7) - GND (D33-16) L - W-B Courtesy signal Driver side door is open → closed 10 to 14 V → Below 1 V
      IND (D33-8) - GND (D33-16) P - W-B Security indicator signal Engine immobiliser system SET → UNSET 3 to 5V → Below 1 V
      D (D33-9) - GND (D33-16) O - W-B Diagnosis tester communication Ignition switch ON Pulse generation
      EFII (D33-12) GND (D33-16) L - W-B ECM input signal Ignition switch ON Waveform 4
      EFIO (D33-13) - GND (D33-16) BR - W-B ECM output signal Ignition switch ON Waveform 3
      VC5 (D33-14) - AGND (D33-5) W-V Power source Ignition switch OFF → ON Below 1 V → 4.6 to 5.4 V
      CODE (D33-15) - AGND (D33-5) LG-V 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 1 (REFERENCE)

        Terminal TXCT - AGND
        Tool Setting 5 V/DIV., 20 ms/DIV.
        Condition Ignition switch ON
        Fig 5: Waveform 1 Reference Graph
        G05005492Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference):
        WAVEFORM 2 (REFERENCE)

        Terminal CODE - AGND
        Tool Setting 5 V/DIV., 20 ms/DIV.
        Condition Ignition switch ON
        Fig 6: Waveform 2 Reference Graph
        G05005491Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Waveform 3 (Reference):
        WAVEFORM 3 (REFERENCE)

        Terminal EFIO - GND
        Tool Setting 10 V/DIV., 500 ms/DIV.
        Condition Ignition switch ON
        Fig 7: Waveform 3 Reference Graph
        G05005496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Waveform 4 (Reference):
        WAVEFORM 3 (REFERENCE)

        Terminal EFII - GND
        Tool Setting 10 V/DIV., 500 ms/DIV.
        Condition Ignition switch ON
    4. Measure the resistance between each terminal of the connector.
      Fig 8: Waveform 4 Reference Graph
      G05005497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      RESISTANCE SPECIFICATIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (D33-5) - GND (D33-16) V - 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 Terminals
    G05404421Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the B50 ECM connector.
    2. Measure the resistance between each terminal of the wire harness side connectors and body ground.
      RESISTANCE SPECIFICATIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      E01 (B50-22) - Body ground W-B - Body groubd 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 B50 ECM connector.
    4. Measure the voltage and resistance between each terminal of the wire harness side connectors and body ground.
      VOLTAGE SPECIFICATIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IMO (A55-10) - E01 (B50-22) G - W-B Transponder key ECU input signal No key in ignition key cylinder → Key inserted Pulse generation (see  1 waveform 1)
      IMI (A55-11) - E01 (B50-22) O - W-B Transponder key ECU output signal No key in ignition key cylinder → Key inserted Pulse generation (see  2 waveform 2)

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

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

        Terminal IMI - GND
        Tool Setting 10V/DIV., 500 ms/DIV.
        Condition No key in ignition key cylinder → Key inserted
        Fig 10: Waveform 1 Reference Graph
        G05005496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference):
        WAVEFORM 2 (REFERENCE)

        Terminal IMO - GND
        Tool Setting 10V/DIV., 500 ms/DIV.
        Condition No key in ignition key cylinder → Key inserted
        Fig 11: Waveform 2 Reference Graph
        G05407224Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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