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Terminals Of Ecu

  1. CHECK ENGINE SWITCH 
    Fig 1: Identifying Engine Switch Connector Terminals
    G04021426Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K29 switch connector.
    2. Measure the resistance of the wire harness.
      SYMBOLS AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (K29-5) - 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 K29 switch connector.
    4. Measure the resistance and voltage of the connector.
      SYMBOLS AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (K29-8) - Body ground V - Body ground Ground Always Below 1 Ω
      VC5 (K29-14) - AGND(K29-8) LG - V Power supply Key is not in cabin Below 1 V
      VC5 (K29-14) - AGND(K29-8) LG - V Power supply Press engine switch* 4.6 to 5.4 V
      CODE (K29-10) - AGND (K29-8) Y - V Demodulated signal of key code data Key is not in cabin Below 1 V
      CODE (K29-10) - AGND (K29-8) Y - V Demodulated signal of key code data Press engine switch and hold key close to engine switch* Pulse generation (see waveform 1)
      TXCT (K29-9) - AGND (K29-8) L - V Key code output signal Key is not in cabin Below 1 V
      TXCT (K29-9) - AGND (K29-8) L - V Key code output signal Press engine switch and hold key close to engine switch* Pulse generation (see waveform 2)

      HINT:

      *: Remove the key's battery before performing this inspection.

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

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

        Item Content
        Symbols (Terminal No.) CODE (K29-10) - AGND (K29-8)
        Tool Setting 2 V/DIV., 20 msec./DIV.
        Condition Press engine switch and hold key close to engine switch*

        HINT:

        *: Remove the key's battery before performing this inspection.

        Fig 2: Identifying Reference Waveform 1
        G04021427Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference)
        WAVEFORM REFERENCE

        Item Content
        Symbols (Terminal No.) TXCT (K29-9) - AGND (K29-8)
        Tool Setting 2 V/DIV., 20 msec./DIV.
        Condition Press engine switch and hold key close to engine switch*

        HINT:

        *: Remove the key's battery before performing this inspection.

        Fig 3: Identifying Reference Waveform Pattern
        G04021428Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK CERTIFICATION ECU 
    Fig 4: Identifying Certification ECU Connector Terminals
    G04021429Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the U28 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.
      SYMBOLS AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      E (U28-17) - Body ground W-B - Body ground Ground Always Below 1 Ω
      +B1 (U28-1) - E (U28-17) R - W-B +B power supply Always 10 to 14 V
      IG (U28-18) - E (U28-17) B - W-B Ignition power supply Engine switch off Below 1 V

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

    3. Reconnect the U28 ECU connector.
    4. Measure the resistance and voltage of the connector.
      SYMBOLS AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AGND (U28-40) - Body ground V - Body ground Engine switch ground Always Below 1 Ω
      VC5 (U28-30) - AGND(U28-40) O - V Engine switch power supply Key is not in cabin Below 1 V
      V5 (U28-30) - AGND(U28-40) O - V Engine switch power supply Press engine switch* 4.6 to 5.4 V
      CODE (U28-9) - AGND (U28-40) Y - V Engine switch CODE input Key is not in cabin Below 1 V
      CODE (U28-9) - AGND (U28-40) Y - V Engine switch CODE input Press engine switch and hold key close to engine switch* Pulse generation (see waveform 1)
      TXCT (U28-8) - AGND (U28-40) L - V Engine switch TX output Key is not in cabin Below 1 V
      TXCT (U28-8) - AGND (U28-40) L - V Engine switch TX output Press engine switch and hold key close to engine switch* Pulse generation (see waveform 2)

      HINT:

      *: Remove the key's battery before performing this inspection.

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

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

        Item Content
        Symbols (Terminal No.) CODE (U28-9) - AGND (U28-40)
        Tool Setting 2 V/DIV., 20 msec./DIV.
        Condition Press engine switch and hold key close to engine switch*

        HINT:

        *: Remove the key's battery before performing this inspection.

        Fig 5: Identifying Reference Waveform 1
        G04021430Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference)
        WAVEFORM REFERENCE

        Item Content
        Symbols (Terminal No.) TXCT (U28-8) - AGND (U28-40)
        Tool Setting 2 V/DIV., 20 msec./DIV.
        Condition Press engine switch and hold key close to engine switch*

        HINT:

        *: Remove the key's battery before performing this inspection.

        Fig 6: Identifying Reference Waveform Pattern
        G04021428Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CHECK IMMOBILIZER CODE ECU 
    Fig 7: Identifying Immobilizer Code ECU
    G04021432Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K58 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.
      SYMBOLS AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (K58-8) - Body ground W-B - Body ground Ground Always Below 1 Ω
      +B (K58-1) - GND (K58-8) G - W-B +B power supply Always 10 to 14 V
      EFII (K58-5) - GND (K58-8) P - W-B ECM input signal Engine switch off Below 1 V
      EFII (K58-5) - GND (K58-8) P - W-B ECM input signal Engine switch on (IG) Pulse generation (see waveform 1)
      EFIO(K58-6) - GND (K58-8) LG - W-B ECM output signal Engine switch off Below 1 V
      EFIO (K58-6) - GND (K58-8) LG - W-B ECM output signal Engine switch on (IG) Pulse generation (see waveform 2)

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

    3. Reconnect the K58 ECU connector.
    4. Measure the voltage of the connector.
      SYMBOLS AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      EFII (K58-5) - GND (K58-8) P - W-B ECM input signal Engine switch off Below 1 V
      EFII (K58-5) - GND (K58-8) P - W-B ECM input signal Engine switch on (IG) Pulse generation (see waveform 1)
      EFIO(K58-6) - GND (K58-8) LG - W-B ECM output signal Engine switch off Below 1 V
      EFIO (K58-6) - GND (K58-8) LG - W-B ECM output signal Engine switch on (IG) Pulse generation (see waveform 2)

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

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

        Item Content
        Symbols (Terminal No.) EFII (K58-5) - GND (K58-8)
        Tool Setting 10 V/DIV., 100 msec./DIV.
        Condition Engine switch on (IG)
        Fig 8: Identifying Reference Waveform Pattern
        G04021433Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2 (Reference)
        WAVEFORM REFERENCE

        Item Content
        Symbols (Terminal No.) EFIO (K58-6) - GND (K58-8)
        Tool Setting 10 V/DIV., 100 msec./DIV.
        Condition Engine switch on (IG)
  4. CHECK POWER SOURCE CONTROL ECU 
    Fig 9: Identifying Reference Waveform
    G04021438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 10: Identifying K73 ECU Connector Terminals
    G04021435Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K73 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.
      SYMBOLS AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND2 (K73-6) - Body ground W-B - Body ground Ground Always Below 1 Ω
      AM2 (K73-12) - Body ground BR -Body ground +B power supply Always 10 to 14 V
      AM1 (K73-33) - Body ground O -Body ground +B power supply Always 10 to 14 V

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

  5. CHECK STEERING CONTROL ECU 
    Fig 11: Identifying K28 ECU Connector Terminals
    G04021436Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K28 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.
      SYMBOLS AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      SGND (K28-2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      GND (K28-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      B (K28-7) - Body ground L - Body ground +B power supply Always 10 to 14 V
      IG2 (K28-6) - Body ground B - Body ground Ignition power supply Engine switch off 0 V
      IG2 (K28-6) - Body ground B - Body ground Ignition power supply Engine switch on (IG) 10 to 14 V

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

  6. CHECK ECM (3GR-FSE) 
    Fig 12: Identifying ECM (3GR-FSE) Connector Terminals
    G04021437Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance and voltage of the connector.
      SYMBOLS AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      E1 (E7-7) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E01 (E6-2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E02 (E6-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E03 (E8-6) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E04 (E45-5) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E05 (E45-3) - Body ground W-B - Body ground Ground Always Below 1 Ω
      EC (A6-2)- Body ground W-B - Body ground Ground Always Below 1 Ω
      ME01 (E8-4) - Body ground W-B - Body ground Ground Always Below 1 Ω
      BATT (A6-4) - E1 (E7-7) L - BR Battery (for measuring battery voltage and for ECM memory) Always 10 to 14 V
      +B (A6-6) - E1 (E7-7) B-R - BR Power source of ECM Engine switch off Below 1 V
      +B (A6-6) - E1 (E7-7) B-R - BR Power source of ECM Engine switch on (IG) 10 to 14 V
      +B1 (A6-5) - E1 (E7-7) B-R - BR Power source of ECM Engine switch off Below 1 V
      +B1 (A6-5) - E1 (E7-7) B-R - BR Power source of ECM Engine switch on (IG) 10 to 14 V
      ME01 (E8) - Body ground W-B - Body ground Ground Always Below 1 Ω
      IMI (A7-6) - E1 (E7-7) W-B - BR Immobilizer code ECU input signal Engine switch off Below 1 V
      IMI (A7-6) - E1 (E7-7) W-B - BR Immobilizer code ECU input signal Engine switch on (IG) Pulse generation (see waveform 1)
      IMO (A7-7) - E1 (E7-7) W-B - BR Immobilizer code ECU output signal Engine switch off Below 1 V
      IMO (A7-7) - E1 (E7-7) W-B - BR Immobilizer code ECU output signal Engine switch on (IG) 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 2 (Reference)
        WAVEFORM REFERENCE

        Item Content
        Symbols (Terminal No.) IMI (A7-6) - E1 (E7-7)
        Tool Setting 10 V/DIV., 100 msec./DIV.
        Condition Engine switch on (IG)
        Fig 13: Identifying Reference Waveform
        G04021438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 1 (Reference)
        WAVEFORM REFERENCE

        Item Content
        Symbols (Terminal No.) IMO (A7-7) - E1 (E7-7)
        Tool Setting 10 V/DIV., 100 msec./DIV.
        Condition Engine switch on (IG)
        Fig 14: Identifying Reference Waveform Pattern
        G04021433Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. CHECK ECM (3UZ-FE) 
    Fig 15: Identifying ECM (3UZ-FE) Connector Terminals
    G04021440Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance of the connector.
      SYMBOLS AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      E1 (E7-7) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E01 (E6-2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E02 (E6-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E03 (E8-6) - Body ground W-B - Body ground Ground Always Below 1 Ω
      EC (A6-2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      ME01 (E8-4) - Body ground W-B - Body ground Ground Always Below 1 Ω
      BATT (A6-4) - E1 (E7-7) L - BR Battery (for measuring battery voltage and for ECM memory) Always 10 to 14 V
      +B (A6-6) - E1 (E7-7) B-R - BR Power source of ECM Engine switch off Below 1 V
      +B (A6-6) - E1 (E7-7) B-R - BR Power source of ECM Engine switch on (IG) 10 to 14 V
      +B1 (A6-5) - E1 (E7-7) B-R - BR Power source of ECM Engine switch off Below 1 V
      +B1 (A6-5) - E1 (E7-7) B-R - BR Power source of ECM Engine switch on (IG) 10 to 14 V
      ME01 (E8) - Body ground W-B - Body ground Ground Always Below 1 Ω
      IMI (A7-6) - E1 (E7-7) W-B - BR Immobilizer code ECU input signal Engine switch off Below 1 V
      IMI (A7-6) - E1 (E7-7) W-B - BR Immobilizer code ECU input signal Engine switch on (IG) Pulse generation (see waveform 1)
      IMO (A7-7) - E1 (E7-7) W-B - BR Immobilizer code ECU output signal Engine switch off Below 1 V
      IMO (A7-7) - E1 (E7-7) W-B - BR Immobilizer code ECU output signal Engine switch on (IG) 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 2 (Reference)
        WAVEFORM REFERENCE

        Item Content
        Symbols (Terminal No.) IMI (A7-6) - E1 (E7-7)
        Tool Setting 10 V/DIV., 100 msec./DIV.
        Condition Engine switch on (IG)
        Fig 16: Identifying Reference Waveform
        G04021438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 1 (Reference)
        WAVEFORM REFERENCE

        Item Content
        Symbols (Terminal No.) IMO (A7-7) - E1 (E7-7)
        Tool Setting 10 V/DIV., 100 msec./DIV.
        Condition Engine switch on (IG)
        Fig 17: Identifying Reference Waveform Pattern
        G04021433Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. CHECK COWL SIDE JUNCTION BLOCK RH (MULTIPLEX NETWORK BODY ECU) 
    Fig 18: Identifying COWL Side Junction Block RH (MULTIPLEX NETWORK BODY ECU)
    G04021443Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the DD and DM junction block connectors.
    2. Measure the resistance and voltage of the wire harness side connectors.
      SYMBOLS AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND2 (DD-7) - Body ground W-B - Body ground Ground Always Below 1 Ω
      IG (DM-1) - Body ground B - Body ground Ignition power supply Engine switch off Below 1 V
      IG (DM-1) - Body ground B - Body ground Ignition power supply Engine switch on (IG) 10 to 14 V

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

    3. Reconnect the DD and DM junction block connectors.
    4. Measure the voltage of the connector.
      SYMBOLS AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IND (K67-24) - Body ground LG - Body ground Indicator light signal Key is not in cabin (immobilizer system is not set) Alternating between 10 to 14 V (0.2 seconds) to below 1 V

      If the result is not as specified, the junction block (ECU) may have a malfunction.

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