ENGINE IMMOBILISER SYSTEM (w/ Smart Entry and Start System) TERMINALS OF ECU


  1. CHECK ENGINE SWITCH

    A01BC7BE11

    1. Measure the resistance and voltage according to the value(s) in the table below.

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      I32-6 (AGND) - Body ground - V - Body ground Transponder key amplifier ground Always Below 1 Ω -
      I32-7 (TXCT) - I32-6 (AGND) Input L - V Immobiliser communication input Engine switch off, brake pedal not depressed, 30 seconds or more elapsed after driver door opened and then closed Below 1 V -
      I32-8 (CODE) - I32-6 (AGND) Output G - V Immobiliser communication output Engine switch off, brake pedal not depressed, 30 seconds or more elapsed after driver door opened and then closed Below 1 V -
      I32-10 (VC5) - I32-6 (AGND) Input B - V Transponder key amplifier power supply Engine switch off, brake pedal not depressed, 30 seconds or more elapsed after driver door opened and then closed Below 1 V -

    2. Check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      I32-7 (TXCT) - I32-6 (AGND) Input L - V

      Signal input from certification ECU (smart key ECU assembly)

      (Code sent from certification ECU (smart key ECU assembly) to transponder key amplifier built into engine switch, and then transmitted by transponder key amplifier antenna as radio waves)

      		 Engine switch off, key not in cabin, within 30 seconds after engine switch pressed

      Pulse generation

      (See waveform 1)

      • BCC Malfunction

      • Abnormal Status

      • Different Encrypt Code

      • Different Serial Number

      • Frame Error

      • Response

        Tech Tips

        If immobiliser key code verification communication is not performed correctly, the malfunction may be indicated by one or more of the Data List items listed above
      I32-8 (CODE) - I32-6 (AGND) Output G - V

      Signal output to certification ECU (smart key ECU assembly)

      (Radio waves from transponder key amplifier built into engine switch used to detect key information. Key information then sent to certification ECU (smart key ECU assembly))

      		 Engine switch off, engine switch pressed with key held near engine switch*

      Pulse generation

      (See waveform 2)
      I32-10 (VC5) - I32-6 (AGND) Input B - V

      Transponder key amplifier power supply

      (Power supplied from certification ECU (smart key ECU assembly) when transponder key amplifier built into engine switch activated)

      		 Engine switch off, key not in cabin, within 30 seconds after engine switch pressed

      Pulse generation

      (See waveform 3)

      Tech Tips

      *: Remove the key battery before performing this inspection.

    3. Using an oscilloscope, check the waveform.

      Tech Tips

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.


      1. A01BGVIE14

        Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection I32-7 (TXCT) - I32-6 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Engine switch off, key not in cabin, within 30 seconds after engine switch pressed
      2. A01BGBRE01

        Waveform 2 (Reference)

        Measurement Condition
        Item Content
        Tester Connection I32-8 (CODE) - I32-6 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Engine switch off, engine switch pressed with key held near engine switch*

        Tech Tips

        *: Remove the key battery before performing this inspection.

      3. A01BF0YE01

        Waveform 3 (Reference)

        Measurement Condition
        Item Content
        Tester Connection I32-10 (VC5) - I32-6 (AGND)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Condition Engine switch off, key not in cabin, within 30 seconds after engine switch pressed

  2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    A01BE4XE03

    1. Disconnect the B75 and B76 certification ECU (smart key ECU assembly) connectors.

    2. Measure the resistance and voltage according to the value(s) in the table below.

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      B75-1 (+B) - B75-10 (E) Input L - W-B +B power supply Always 11 to 14 V -
      B75-10 (E) - Body ground - W-B - Body ground Ground Always Below 1 Ω -

    3. Reconnect the B75 and B76 certification ECU (smart key ECU assembly) connectors.

    4. Measure the resistance and voltage according to the value(s) in the table below.

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      B75-15 (IND) - B75-10 (E) Output L - W-B Security indicator output Engine switch off → on (IG)

      Pulse generation

      → Below 2 V

      		 -
      B76-2 (TXCT) - B75-24 (AGND) Output L - V Signal output to transponder key amplifier Engine switch off, brake pedal not depressed, 30 seconds or more elapsed after driver door opened and then closed Below 1 V

      • BCC Malfunction

      • Abnormal Status

      • Different Encrypt Code

      • Different Serial Number

      • Frame Error

      • Response
      B76-1 (CODE) - B75-24 (AGND) Input G - V Signal input from transponder key amplifier Engine switch off, brake pedal not depressed, 30 seconds or more elapsed after driver door opened and then closed Below 1 V
      B76-20 (VC5) - B75-24 (AGND) Output B - V Transponder key amplifier power supply Engine switch off, brake pedal not depressed, 30 seconds or more elapsed after driver door opened and then closed Below 1 V
      B75-24 (AGND) - Body ground - V - Body ground Transponder key amplifier ground Always Below 1 Ω

    5. Check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      B76-2 (TXCT) - B75-24 (AGND) Output L - V

      Signal output to transponder key amplifier

      (Code sent from certification ECU (smart key ECU assembly) to transponder key amplifier built into engine switch, and then transmitted by transponder key amplifier antenna as radio waves)

      		 Engine switch off, key not in cabin, within 30 seconds after engine switch pressed

      Pulse generation

      (See waveform 1)

      • BCC Malfunction

      • Abnormal Status

      • Different Encrypt Code

      • Different Serial Number

      • Frame Error

      • Response
      B76-1 (CODE) - B75-24 (AGND) Input G - V

      Signal input from transponder key amplifier

      (Radio waves from transponder key amplifier built into engine switch used to detect key information. Key information then sent to certification ECU (smart key ECU assembly))

      		 Engine switch off, engine switch pressed with key held near engine switch*

      Pulse generation

      (See waveform 2)
      B76-20 (VC5) - B75-24 (AGND) Output B - V

      Transponder key amplifier power supply

      (Power supplied from certification ECU (smart key ECU assembly) when transponder key amplifier built into engine switch activated)

      		 Engine switch off, key not in cabin, within 30 seconds after engine switch pressed

      Pulse generation

      (See waveform 3)

      Tech Tips

      *: Remove the key battery before performing this inspection.

    6. Using an oscilloscope, check the waveform.

      Tech Tips

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.


      1. A01BGVIE14

        Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection B76-2 (TXCT) - B75-24 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Engine switch off, key not in cabin, within 30 seconds after engine switch pressed
      2. A01BGBRE01

        Waveform 2 (Reference)

        Measurement Condition
        Item Content
        Tester Connection B76-1 (CODE) - B75-24 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Engine switch off, engine switch pressed with key held near engine switch*

        Tech Tips

        *: Remove the key battery before performing this inspection.

      3. A01BF0YE01

        Waveform 3 (Reference)

        Measurement Condition
        Item Content
        Tester Connection B76-20 (VC5) - B75-24 (AGND)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Condition Engine switch off, key not in cabin, within 30 seconds after engine switch pressed

  3. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)

    A01BD90E02

    1. Measure the voltage and resistance and check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      H80-1 (GND) - Body ground - W-B - Body ground Ground Always Below 1 Ω -
      H80-3 (IGE) - H80-1 (GND) Input V - W-B Steering lock motor operation permission signal (motor operation permission signal supplied by certification ECU (smart key ECU assembly))

      Steering lock motor operates when both conditions met, and then door opened:


      • Shift lever in P

      • Key carried, engine switch turned on (IG), steering unlocked and then engine switch turned off

      Pulse generation

      (See waveform 1)

      • Power Supply Short

      • Unlock Request Receive

      • Lock Request Receive
      H80-4 (SLP1) - H80-1 (GND) Output LG - W-B Steering lock bar position signal (signal output from steering unlock sensor) Steering locked → unlocked* 11 to 14 V → Below 1.5 V

      • Push Start Error

      • Sensor Value
      H80-6 (IG2) - H80-1 (GND) Input B - W-B IG signal (IG2 power supply input for steering lock motor) Engine switch off → on (IG) Below 1 V → 11 to 14 V B2788
      H80-7 (B) - Body ground Output W - Body ground Constant power supply Always 11 to 14 V B2788

      Tech Tips

      *: The steering locks when any door is opened with the shift lever in P and the engine switch off. The steering unlocks when the engine switch is turned on (ACC).

    2. Using an oscilloscope, check the waveform.

      Tech Tips

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.


      1. A01BHYHE01
        Text in Illustration
        *a Steering lock motor not operating
        *b Steering lock motor operating

        Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection H80-3 (IGE) - H80-1 (GND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition

        Steering lock motor operates when both conditions met, and then door opened:


        • Shift lever in P

        • Key carried, engine switch turned on (IG), steering unlocked, and then engine switch turned off

  4. CHECK ID CODE BOX (IMMOBILISER CODE ECU)

    A01BBO7E04

    1. Disconnect the H81 ID code box (immobiliser code ECU) connector.

    2. Measure the voltage and resistance according to the value(s) in the table below.

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      H81-1 (+B) - H81-5 (GND) Input W - W-B +B power supply Always 11 to 14 V B2789
      H81-5 (GND) - Body ground - W-B - Body ground Ground Always Below 1 Ω B2789

    3. Reconnect the H81 ID code box (immobiliser code ECU) connector.

    4. Measure the voltage and check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      H81-3 (EFII) - H81-5 (GND) Input R - W-B EFI communication input (Signal input from ECM to ID code box (immobiliser code ECU)) Engine switch off Below 1 V

      • B2799

      • B279A

      • Engine Start Request

      • EFI Code Receiver
      H81-3 (EFII) - H81-5 (GND) Input R - W-B EFI communication input (Signal input from ECM to ID code box (immobiliser code ECU)) Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

      Pulse generation

      (See waveform 1)
      H81-4 (EFIO) - H81-5 (GND) Output B - W-B EFI communication output (Signal output from ID code box (immobiliser code ECU) to ECM) Engine switch off Below 1 V
      H81-4 (EFIO) - H81-5 (GND) Output B - W-B EFI communication output (Signal output from ID code box (immobiliser code ECU) to ECM) Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

      Pulse generation

      (See waveform 2)

    5. Using an oscilloscope, check the waveform.

      Tech Tips

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.


      1. Waveform 1 (Reference)

        A01BB0SE01
        Text in Illustration
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection H81-3 (EFII) - H81-5 (GND)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

      2. Waveform 2 (Reference)

        A01BD2YE01
        Text in Illustration
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection H81-4 (EFIO) - H81-5 (GND)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

  5. CHECK ECM

    A01BBM1E07

    1. Measure the voltage and resistance and check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      B72-20 (+B2) - D98-109 (E1) Input L - W-B Power source of ECM Engine switch on (IG) 11 to 14 V -
      B72-1 (+B) - D98-109 (E1) Input L - W-B Power source of ECM Engine switch on (IG) 11 to 14 V -
      B72-2 (BATT) - D98-109 (E1) Input W - W-B Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V -
      D98-109 (E1) - Body ground - W-B - Body ground Ground Always Below 1 Ω -
      B72-15 (IMO) - D98-109 (E1) Input R - W-B Certification ECU (smart key ECU assembly) communication input Engine switch off 11 to 14 V -
      B72-15 (IMO) - D98-109 (E1) Input R - W-B Certification ECU (smart key ECU assembly) communication input Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

      Pulse generation

      (See waveform 1)

      		 -
      B72-16 (IMI) - D98-109 (E1) Output B - W-B Certification ECU (smart key ECU assembly) communication output Engine switch off Below 1 V -
      B72-16 (IMI) - D98-109 (E1) Output B - W-B Certification ECU (smart key ECU assembly) communication output Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

      Pulse generation

      (See waveform 2)

      		 -

    2. Using an oscilloscope, check the waveform.

      Tech Tips

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.


      1. Waveform 1 (Reference)

        A01BB0SE01
        Text in Illustration
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection B72-15 (IMO) - D98-109 (E1)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

      2. Waveform 2 (Reference)

        A01BD2YE01
        Text in Illustration
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection B72-16 (IMI) - D98-109 (E1)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected