LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 1941 (Engine Immobilizer) >> Engine Immobiliser System >> Terminals Of Ecu
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Terminals Of Ecu

WARNING: This page is about a different car, the 2006 Scion tC. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK TRANSPONDER KEY AMPLIFIER 
    Fig 1: Identifying Transponder Key Amplifier Connector Terminals
    G04224067Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T7 amplifier connector.
    2. Measure the resistance of the wire harness side connector.
      TERMINALS DESCRIPTION - SPECIFIED CONDITIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T7-7) - 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 T7 amplifier connector.
    4. Measure the resistance and voltage of the connector.
      TERMINALS DESCRIPTION - SPECIFIED CONDITIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (T7-7) - Body ground V - Body ground Ground Always Below 1 Ω
      VC5 (T7-1) - GND (T7-7) L - V Power source No key in ignition key cylinder Below 1 V
      Key inserted 4.6 to 5.4 V
      CODE (T7-4) - GND (T7-7) Y - V Demodulated signal of key code data No key in ignition key cylinder Below 1 V
      Key inserted Pulse generation (see WAVEFORM 1 )
      TXCT (T7-5) - GND (T7-7) R - V Key code output signal No key in ignition key cylinder Below 1 V
      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) 
        WAVEFORM 1 REFERENCE

        Item Content
        Symbols (Terminal No.) CODE (T7-4) - GND (T7-7)
        Tool Setting 2 V/DIV., 20 msec./DIV.
        Condition Key inserted
        Fig 2: Waveform 1
        G04224068Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. WAVEFORM 2 (REFERENCE) 
    WAVEFORM 2 REFERENCE

    Item Content
    Symbols (Terminal No.) TXCT (T7-5) - GND (T7-7)
    Tool Setting 2 V/DIV., 20 msec./DIV.
    Condition Key inserted
    Fig 3: Waveform 2
    G04224069Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK TRANSPONDER KEY ECU ASSEMBLY 
    Fig 4: Identifying Transponder Key ECU Assembly Connector Terminals
    G04224070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T8 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      TERMINALS DESCRIPTION - SPECIFIED CONDITIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (T8-13) - Body ground V - Body ground Ground Always Below 1 Ω
      GND (T8-14) - Body ground BR-W - Body ground Ground Always Below 1 Ω
      +B (T8-1) - GND (T8-14) G - BR-W Power source supply Always 10 to 14 V
      IG (T8-2) - GND (T8-14) LG - BR-W Ignition power supply Ignition switch OFF Below 1 V
      Ignition switch ON 10 to 14 V
      KSW (T8-10) - GND (T8-14) B - BR-W Unlock warning switch No key in ignition key cylinder 10 kΩ or higher
      Key inserted Below 1 Ω

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

    3. Reconnect the T8 ECU connector.
    4. Measure the voltage of the connector.
      TERMINALS DESCRIPTION - SPECIFIED CONDITIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      KSW (T8-10) - GND (T8- 14) B - BR-W Unlock warning switch No key in ignition key cylinder 10 to 14 V
      Key inserted Below 1 V
      VC5 (T8-8) - GND (T8-14) L - BR-W Power source of transponder key amplifier Ignition switch OFF Below 1 V
      Ignition switch ON 4.6 to 5.4 V
      CODE (T8-11) - AGND (T8-13) Y - V Transponder key amplifier communication signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see WAVEFORM 1 )
      TXCT (T8-12) - AGND (T8-13) R - V Transponder key amplifier communication signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see WAVEFORM 2 )
      EFIO (T8-6) - GND (T8- 14) O - BR-W ECM output signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see WAVEFORM 3 )
      EFII (T8-7) - GND (T8-14) GR - BR-W ECM output signal Ignition switch OFF Below 1 V
      Ignition switch ON Pulse generation (see WAVEFORM 4 )
      CTY (T8-4) - GND (T8-14) BR - BR-W Door courtesy switch Driver side door fully closed 10 to 14 V
      Driver side door open Below 1 V
      IND (T8-3) - GND (T8-14) B - BR-W Security indicator light Engine immobilizer system set (indicator is blinking) Alternating between 10 to 14 V (0.2 sec.) and below 1 V (1.8 sec.)

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

    5. Inspect using an oscilloscope.
      1. WAVEFORM 1 (REFERENCE) 
        WAVEFORM 1 (REFERENCE)

        Item Content
        Symbols (Terminal No.) CODE (T8-11) - AGND (T8-13)
        Tool Setting 2 V/DIV., 20 msec./DIV.
        Condition Key inserted
        Fig 5: Waveform 1
        G04224071Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. WAVEFORM 2 (REFERENCE) 
        WAVEFORM 2 (REFERENCE)

        Item Content
        Symbols (Terminal No.) TXCT (T8-12) - AGND (T8-13)
        Tool Setting 2 V/DIV., 20 msec./DIV.
        Condition Key inserted
        Fig 6: Waveform 2
        G04224072Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. WAVEFORM 3 (REFERENCE) 
        WAVEFORM 3 (REFERENCE)

        Item Content
        Symbols (Terminal No.) EFIO (T8-6) - GND (T8-14)
        Tool Setting 10 V/DIV., 100 msec./DIV.
        Condition Ignition switch ON
        Fig 7: Waveform 3
        G04224073Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. WAVEFORM 4 (REFERENCE) 
    WAVEFORM 4 (REFERENCE)

    Item Content
    Symbols (Terminal No.) EFII (T8-7) - GND (T8-14)
    Tool Setting 10 V/DIV., 100 msec./DIV.
    Condition Ignition switch ON
    Fig 8: Waveform 4
    G04224074Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CHECK ECM 
Fig 9: Identifying ECM Connector Terminals
G04224075Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Measure the voltage and resistance of the connectors.
    TERMINALS DESCRIPTION - SPECIFIED CONDITIONS

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    E01 (E8-7) - Body ground B - Body ground Ground Always Below 1 Ω
    E0M (E4-15) - Body ground W-B - Body ground Ground Always Below 1 Ω
    E02 (E8-6) - Body ground P - Body ground Ground Always Below 1 Ω
    E1 (E6-1) - Body ground L - Body ground Ground Always Below 1 Ω
    BATT (E4-3) - E1 (E6-1) V - L Battery Always 10 to 14 V
    +B (E4-1) - E1 (E6-1) B - L Ignition power supply Ignition switch ON 10 to 14 V
    IMI (E5-27) - E0M (E4-15) O - W-B Transponder key ECU input signal Ignition switch OFF Below 1 V
    Ignition switch ON Pulse generation (see WAVEFORM 1 )
    IMO (E5-26) - E0M (E4-15) GR -W-B Transponder key ECU output signal Ignition switch OFF Below 1 V
    Ignition switch ON Pulse generation (see WAVEFORM 2 )

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

  2. Inspect using an oscilloscope.
    1. WAVEFORM 1 (REFERENCE) 
      WAVEFORM 1 (REFERENCE)

      Item Content
      Symbols (Terminal No.) IMI (E5-27) - E0M (E4-15)
      Tool Setting 10 V/DIV., 100 msec./DIV.
      Condition Ignition switch ON
      Fig 10: Waveform 1
      G04224076Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. WAVEFORM 2 (REFERENCE) 
WAVEFORM 2 (REFERENCE)

Item Content
Symbols (Terminal No.) IMO (E5-26) - E0M (E4-15)
Tool Setting 10 V/DIV., 100 msec./DIV.
Condition Ignition switch ON
Fig 11: Waveform 2
G04224077Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
scientia non olet · About LEMON Manuals