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Terminals Of Ecu

  1. CHECK TRANSPONDER KEY AMPLIFIER 
    Fig 1: Identifying Transponder Key Amplifier 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.
      TRANSPONDER KEY AMPLIFIER CONNECTOR TERMINALS RESISTANCE SPECIFICATION DISCONNECT

      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.
      TRANSPONDER KEY AMPLIFIER CONNECTOR TERMINALS VOLTAGE SPECIFICATION RECONNECT

      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 REFERENCE (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 REFERENCE (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 (WAVEFORM 1)

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

      Terminal TXCT - GND
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition No key in ignition key cylinder → Key inserted
      Fig 3: Waveform Graph (Waveform 2)
      G05005492Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK TRANSPONDER KEY ECU ASSEMBLY 
    Fig 4: Identifying Transponder Key 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.
      TRANSPONDER KEY ECU CONNECTOR TERMINALS VOLTAGE SPECIFICATION DISCONNECT

      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.
      TRANSPONDER KEY ECU CONNECTOR TERMINALS VOLTAGE SPECIFICATION RECONNECT

      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 REFERENCE (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) 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 REFERENCE (WAVEFORM 4) 
      EFIO (D33-13) - GND (D33-16) BR - W-B ECM output signal Ignition switch ON WAVEFORM REFERENCE (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 REFERENCE (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 (WAVEFORM 1)

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

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

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

        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 Graph (Waveform 4)
      G05005497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      RESISTANCE SPECIFICATION

      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 B45 and D41 ECM connectors.
      2. Fig 9: Identifying ECM Connector Terminals
      G05005498Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance between each terminal of the wire harness side connectors and body ground.
      ECM CONNECTOR TERMINALS RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IMO (D41-15) - E01 (B45-7) BR - W-B Transponder key ECU input signal No key in ignition key cylinder → Key inserted Pulse generation (see WAVEFORM REFERENCE (WAVEFORM 1) )
      IMI (D41-16) - E01 (B45-7) L - W-B Transponder key ECU output signal No key in ignition key cylinder → Key inserted Pulse generation (see WAVEFORM REFERENCE (WAVEFORM 2) 
      E01 (B45-7) - 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. Inspect using an oscilloscope.
      1. Waveform 1 (Reference):
        WAVEFORM REFERENCE (WAVEFORM 1)

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

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