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Terminals Of Ecu

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  1. CHECK TRANSPONDER KEY AMPLIFIER 
    1. Disconnect the E5 amplifier connector.
    2. Measure the resistance of the wire harness side connector.
      Fig 1: Identifying E5 Amplifier Connector
      G04490642Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TRANSPONDER KEY AMPLIFIER RESISTANCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (E5-7) - Body ground R - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction in the wire harness.

    3. Reconnect the E5 amplifier connector.
    4. Measure the resistance and voltage of the connector.
      TRANSPONDER KEY AMPLIFIER RESISTANCE AND VOLTAGE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (E5-7) - Body ground R - Body ground Ground Always Below 1 Ω
      VC5 (E5-1) - AGND (E5-7) B - R Power source No key is in ignition key cylinder Below 1 V
      Key inserted 4.6 to 5.4 V
      CODE (E5-4) - AGND (E5-7) P - R Demodulated signal of key code data No key is in ignition key cylinder Below 1 V
      Key inserted Pulse generation (see Fig 2)
      TXCT (E5-5) - AGND (E5-7) G - R Key code output signal No key is in ignition key cylinder Below 1 V
      Key inserted Pulse generation (see Fig 3)

      If the result is not as specified, there may be a malfunction in the amplifier.

    5. Using an oscilloscope, check the waveform 1.
      Fig 2: Waveform 1 Graph
      G04490643Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 1 (Reference): 

      WAVEFORM 1 (REFERENCE)

      Item Content
      Symbols (Terminal No.) CODE (E5-4) - AGND (E5-7)
      Tool Setting 5 V/DIV., 20 msec./DIV.
      Condition Key inserted
    6. Using an oscilloscope, check the waveform 2.
      Fig 3: Waveform 2 Graph
      G04490644Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 2 (Reference): 

      WAVEFORM 2 (REFERENCE)

      Item Content
      Symbols (Terminal No.) TXCT (E5-5) - AGND (E5-7)
      Tool Setting 5 V/DIV., 20 msec./DIV.
      Condition Key inserted
  2. CHECK TRANSPONDER KEY ECU 
    Fig 4: Identifying E46 Transponder Key ECU Connector
    G04490645Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E46 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.
      TRANSPONDER KEY ECU RESISTANCE AND VOLTAGE DISCONNECT

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (E46-16) - Body ground W-B - Body ground Ground Always Below 1 Ω
      +B (E46-1) - GND (E46-16) R - W-B Battery Always 10 to 14 V
      IG (E46-2) - GND (E46-16) B - W-B Ignition switch Ignition switch OFF Below 1 V
      Ignition switch ON 10 to 14 V

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the E46 ECU connector.
    4. Measure the resistance and voltage of the connector.
      TRANSPONDER KEY ECU RESISTANCE AND VOLTAGE RECONNECT

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (E46-5) - GND (E46-16) R - W-B Amplifier ground circuit Always Below 1 Ω
      EGND (E46-11) - GND (E46-16) V - W-B ECM ground circuit Always Below 1 Ω
      KSW (E46-3) - GND (E46-16) L - W-B Unlock warning switch No key is in ignition key cylinder 10 to 14 V
      Key inserted Below 1 V
      VC5 (E46-14) - AGND (E46-5) B - R Power source No key is in ignition key cylinder Below 1 V
      Key inserted 4.6 to 5.4 V
      TXCT (E46-4) - AGND (E46-5) G - R Transponder key amplifier communication signal No key is in ignition key cylinder Below 1 V
      Key inserted Pulse generation (see Fig 5)
      CODE (E46-15) - AGND (E46-5) P - R Transponder key amplifier communication signal No key is in ignition key cylinder Below 1 V
      Key inserted Pulse generation (see Fig 6)
      EFIO (E46-13) - EGND (E46-11) P - V ECM output signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see Fig 7)
      EFII (E46-12) - EGND (E46-11) LG - V ECM input signal Ignition switch OFF Below 1 V
      Ignition switch OFF Pulse generation (see Fig 8)
      IND (E46-8) - GND (E46-16) Y - W-B Security indicator light signal Engine immobilizer system SET 3 to 5 V
      Engine immobilizer system UNSET Below 1 V
      D (E46-9) - GND (E46-16) W - W-B Diagnosis tester communication Ignition switch ON Pulse generation

      If the result is not as specified, there may be a malfunction in the ECU.

    5. Using an oscilloscope, check the waveform 1.
      Fig 5: Waveform 1 Graph
      G04490646Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 1 (Reference): 

      WAVEFORM 1 (REFERENCE)

      Item Content
      Symbols (Terminal No.) TXCT (E46-4) - AGND (E46-5)
      Tool Setting 5 V/DIV., 20 msec./DIV.
      Condition Key inserted
    6. Using an oscilloscope, check the waveform 2.
      Fig 6: Waveform 2 Graph
      G04490647Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 2 (Reference): 

      WAVEFORM 2 (REFERENCE)

      Item Content
      Symbols (Terminal No.) CODE (E46-15) - AGND (E46-5)
      Tool Setting 5 V/DIV., 20 msec./DIV.
      Condition Key inserted
    7. Using an oscilloscope, check the waveform 3.
      Fig 7: Waveform 3 Graph
      G04490648Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 3 (Reference): 

      WAVEFORM 3 (REFERENCE)

      Item Content
      Symbols (Terminal No.) EFIO (E46-13) - EGND (E46-11)
      Tool Setting 10 V/DIV., 500 msec./DIV.
      Condition Ignition switch ON
    8. Using an oscilloscope, check the waveform 4.
      Fig 8: Waveform 4 Graph
      G04490649Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 4 (Reference): 

      WAVEFORM 4 (REFERENCE)

      Item Content
      Symbols (Terminal No.) EFII (E46-12) - EGND (E46-11)
      Tool Setting 10 V/DIV., 500 msec./DIV
      Condition Ignition switch ON
  3. CHECK ECM 
    Fig 9: Identifying ECM Wire Harness Side Connector
    G04490650Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance and voltage of the wire harness side connector.
      ECM RESISTANCE AND VOLTAGE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      EOM (A9-9) - Body ground V - Body ground Ground Always Below 1 Ω
      IMI (A9-11) - EOM (A9-9) P - V Transponder key ECU input signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see Fig 10)
      IMO (A9-10) - EOM (A9-9) LG - V Transponder key ECU output signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see Fig 11)

      If the result is not as specified, there may be a malfunction in the wire harness.

    2. Using an oscilloscope, check the waveform 1.
      Fig 10: Waveform 1 Graph
      G04490651Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 1 (Reference): 

      WAVEFORM 1 (REFERENCE)

      Item Content
      Symbols (Terminal No.) IMI (A9-11) - EOM (A9-9)
      Tool Setting 10 V/DIV., 500 msec./DIV.
      Condition Ignition switch ON
    3. Using an oscilloscope, check the waveform 2.
      Fig 11: Waveform 2 Graph
      G04490652Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 2 (Reference): 

      WAVEFORM 2 (REFERENCE)

      Item Content
      Symbols (Terminal No.) IMO (A9-10) - EOM (A9-9)
      Tool Setting 10 V/DIV., 500 msec./DIV.
      Condition Ignition switch ON
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