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Terminals Of Ecu

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

      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.
      ECU TERMINAL REFERENCE

      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 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 waveform  2)

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

    5. Inspect using an oscilloscope.
      1. Waveform 1 (Reference):
        Fig 2: Waveform 1 Graph
        G05005491Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        WAVEFORM 1 REFERENCE

        Terminal CODE - AGND
        Tool Setting 10V/DIV., 20 ms/DIV.
        Condition No key in ignition key cylinder → Key inserted
      2. Waveform 2 (Reference):
    Fig 3: Waveform 2 Graph
    G05005492Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    WAVEFORM 2 REFERENCE

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

      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.
      ECU TERMINAL REFERENCE

      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 immobilizer system SET → UNSET 3 to 5V → Below 1 V
      D(D33-9)-GND(D33-16) BE - 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 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 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 Graph
        G05005496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Waveform 4 (Reference):
      WAVEFORM 4 REFERENCE

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

    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 
    1. Disconnect the B50 ECM connector.
      Fig 9: Identifying B50 ECM Connector
      G05404421Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance between each terminal of the wire harness side connectors and body ground.
      ECM TERMINAL REFERENCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      E01 (B50-22) - 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.

    3. Reconnect the B50 ECM connector.
    4. Measure the voltage and resistance between each terminal of the wire harness side connectors and body ground.
      ECM TERMINAL REFERENCE

      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 waveform  1)
      IMI (A55-11) - E01 (B50-22) BE-W-B Transponder key ECU output signal No key in ignition key cylinder → Key inserted Pulse generation (see 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 10 V/DIV., 500 ms/DIV.
        Condition No key in ignition key cylinder → Key inserted
        Fig 10: Waveform 1 Graph
        G05005496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference):
    WAVEFORM 2 REFERENCE

    Terminal IMO - GND
    Tool Setting 10 V/DIV., 500 ms/DIV.
    Condition No key in ignition key cylinder → Key inserted
    Fig 11: Waveform 2 Graph
    G05005497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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