ENGINE IMMOBILISER SYSTEM TERMINALS OF ECU


  1. CHECK ENGINE SWITCH

    A01FHHKE09

    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
      N43-6 (AGND) - Body ground - L - Body ground Transponder key amplifier ground Always Below 1 Ω -
      N43-7 (TXCT) - N43-6 (AGND) Input W - L 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 -
      N43-8 (CODE) - N43-6 (AGND) Output Y - L 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 -
      N43-10 (VC5) - N43-6 (AGND) Input L - L 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
      N43-7 (TXCT) - N43-6 (AGND) Input W - L

      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 certification communication is not performed correctly, the malfunction may be indicated by one or more of the Data List items listed above
      N43-8 (CODE) - N43-6 (AGND) Output Y - L

      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)
      N43-10 (VC5) - N43-6 (AGND) Input L - L

      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. Inspect using an oscilloscope.

      Note

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


      1. A01FIAKE14

        Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection N43-7 (TXCT) - N43-6 (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. A01FFBUE01
        Text in Illustration
        *a Key held against engine switch

        Waveform 2 (Reference)

        Measurement Condition
        Item Content
        Tester Connection N43-8 (CODE) - N43-6 (AGND)
        Tool Setting 1 V/DIV., 200 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. A01FGX3E01

        Waveform 3 (Reference)

        Measurement Condition
        Item Content
        Tester Connection N43-10 (VC5) - N43-6 (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)

    A01FFX4E37

    1. Disconnect the A34 certification ECU (smart key ECU assembly) connector.

    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
      A34-2 (+B) - A34-11 (E) Input

      W - W-B*1

      W - BR*2

      		 +B power supply Always 11 to 14 V -
      A34-10 (CUTB) - A34-11 (E) Input

      P - W-B*1

      P - BR*2

      		 Dark current cut pin Always 11 to 14 V -
      A34-11 (E) - Body ground -

      W-B - Body ground*1

      BR - Body ground*2

      		 Ground Always Below 1 Ω -

      • *1: for LHD

      • *2: for RHD

    3. Reconnect the A34 certification ECU (smart key ECU assembly) connector.

    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
      N93-5 (IG) - A34-11 (E) Input

      B - W-B*1

      B - BR*2

      		 Ignition power supply Engine switch off → on (IG) Below 1 V → 11 to 14 V Ignition Switch
      N93-18 (IND) - A34-11 (E) Output

      LG - W-B*1

      LG - BR*2

      		 Security indicator output Engine switch off → on (IG)

      Pulse generation

      → Below 2 V

      		 -
      N93-9 (TXCT) - N93-24 (AGND) Output W - L 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
      N93-7 (CODE) - N93-24 (AGND) Input Y - L 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
      N93-1 (VC5) - N93-24 (AGND) Output L - L 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
      N93-24 (AGND) - Body ground - L - Body ground Transponder key amplifier ground Always Below 1 Ω

      • *1: for LHD

      • *2: for RHD

    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
      N93-9 (TXCT) - N93-24 (AGND) Output W - L

      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
      N93-7 (CODE) - N93-24 (AGND) Input Y - L

      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)
      N93-1 (VC5) - N93-24 (AGND) Output L - L

      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. Inspect using an oscilloscope.

      Note

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


      1. A01FIAKE14

        Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection N93-9 (TXCT) - N93-24 (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. A01FFBUE01
        Text in Illustration
        *a Key held against engine switch

        Waveform 2 (Reference)

        Measurement Condition
        Item Content
        Tester Connection N93-7 (CODE) - N93-24 (AGND)
        Tool Setting 1 V/DIV., 200 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. A01FGX3E01

        Waveform 3 (Reference)

        Measurement Condition
        Item Content
        Tester Connection N93-1 (VC5) - N93-24 (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 ID CODE BOX (IMMOBILISER CODE ECU)

    A01FIYDE01

    1. Disconnect the N73 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
      N73-1 (+B) - Body ground Input GR - Body ground +B power supply Engine switch off 11 to 14 V B2789
      N73-5 (GND) - Body ground - W-B - Body ground Ground Always Below 1 Ω B2789

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

    3. Reconnect the N73 ID code box (immobiliser code ECU) connector.

    4. Measure the voltage and check the pulse 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
      N73-3 (EFII) - N73-5 (GND) Input P - W-B

      EFI communication input

      (Signal input from ECM to certification ECU [smart key ECU assembly])

      		 Engine switch off 11 to 14 V

      • B2799

      • B279A

      • Engine Start Request

      • EFI Code Receive
      N73-4 (EFIO) - N73-5 (GND) Output LG - W-B

      EFI communication output

      (Signal output from certification ECU [smart key ECU assembly] to ECM)

      		 Engine switch off Below 1 V
      N73-3 (EFII) - N73-5 (GND) Input P - W-B

      EFI communication input

      (Signal input from ECM to certification ECU [smart key ECU assembly])

      		 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)
      N73-4 (EFIO) - N73-5 (GND) Output LG - W-B

      EFI communication output

      (Signal output from certification ECU [smart key ECU assembly] 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. Inspect using an oscilloscope.

      Note

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


      1. Waveform 1 (Reference)

        A01FHB2E01
        Text in Illustration
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection N73-3 (EFII) - N73-5 (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)

        A01FF7DE01
        Text in Illustration
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection N73-4 (EFIO) - N73-5 (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

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

    A01FDUVE01

    1. 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
      N24-1 (GND) - Body ground - W-B - Body ground Ground Always Below 1 Ω -
      N24-3 (IGE) - N24-1 (GND) Input G - 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
      N24-4 (SLP1) - N24-1 (GND) Output L - W-B Steering lock bar position signal (signal output from steering unlock sensor) Steering locked → unlocked*1 11 to 14 V → Below 1.2 V

      • Push Start Error

      • Sensor Value
      N24-6 (IG2) - N24-1 (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

      • Ignition Switch
      N24-7 (B) - Body ground Output L - Body ground Constant power supply Always 11 to 14 V B2788

      Tech Tips

      *1: 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. Inspect using an oscilloscope.

      Note

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


      1. A01FDO4E01
        Text in Illustration
        *a Steering lock motor not operating
        *b Steering lock motor operating

        Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection N24-3 (IGE) - N24-1 (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

  5. CHECK ECM

    A01FIC4E94

    Tech Tips

    The standard voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard voltage for that pair of terminals, displayed in the "Specified Condition" column. The illustration above can be used as a reference to identify the ECM terminal locations.

    Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
    A21-1 (+B2) - F4-1 (E1) Input P - BR Power source of ECM Engine switch on (IG) 11 to 14 V -
    A21-2 (+B) - F4-1 (E1) Input P - BR Power source of ECM Engine switch on (IG) 11 to 14 V -
    A19-3 (MREL) - F4-1 (E1) Input Y - BR EFI MAIN1 relay Engine switch on (IG) 11 to 14 V -
    A19-7 (BATT) - F4-1 (E1) Input L - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V -
    F4-1 (E1) - Body ground - BR - Body ground Ground Always Below 1 Ω -
    A21-30 (IMO) - F4-1 (E1) Input P - BR Certification ECU (smart key ECU assembly) communication input Engine switch off 11 to 14 V -
    A21-30 (IMO) - F4-1 (E1) Input P - BR 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)

    		 -
    A21-31 (IMI) - F4-1 (E1) Output LG - BR Certification ECU (smart key ECU assembly) communication output Engine switch off Below 1 V -
    A21-31 (IMI) - F4-1 (E1) Output LG - BR 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)

    		 -

    1. Inspect using an oscilloscope.

      Note

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


      1. Waveform 1 (Reference)

        A01FHB2E01
        Text in Illustration
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection A21-30 (IMO) - F4-1 (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)

        A01FF7DE01
        Text in Illustration
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection A21-31 (IMI) - F4-1 (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