ENGINE IMMOBILISER SYSTEM TERMINALS OF ECU

  1. CHECK ENGINE SWITCH

    B146454N02

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

      Table 1. Inspection with Engine Switch Off

      Terminal No. (Symbol)

      Input/Output

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      Related Data List Item/DTC

      G24-8 (AGND) - Body ground

      -

      GR - Body ground

      Ground

      Always

      Below 1 Ω

      -

      G24-9 (TXCT) - G24-8 (AGND)

      Input

      W - GR

      Immobiliser communication input

      Engine switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed

      Below 1 V

      -

      G24-10 (CODE) - G24-8 (AGND)

      Output

      V - GR

      Immobiliser communication output

      Engine switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed

      Below 1 V

      -

      G24-14 (VC5) - G24-8 (AGND)

      Input

      P - GR

      Transponder key amplifier power supply

      Engine switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed

      Below 1 V

      -
      Table 2. Inspection of Waveforms of Communication Signals between Engine Switch and Certification ECU

      Terminal No. (Symbol)

      Input/Output

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      Related Data List Item/DTC

      G24-9 (TXCT) - G24-8 (AGND)

      Input

      W - GR

      Signal input from certification ECU

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

      After engine switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed

      Pulse generation

      (See waveform 1)

      • BCC Malfunction

      • Abnormal Status

      • Different Encrypt Code

      • Different Serial Number

      (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)

      G24-10 (CODE) - G24-8 (AGND)

      Output

      V - GR

      Signal output to certification ECU

      (Electric waves from transponder key amplifier built into engine switch used to detect key information. Information then sent to certification ECU)

      After engine switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed, and then key held against engine switch*

      Pulse generation

      (See waveform 2)

      G24-14 (VC5) - G24-8 (AGND)

      Input

      P - GR

      Transponder key amplifier power supply

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

      After engine switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed

      Pulse generation

      (See waveform 3)
      Tip:

      *: Remove the key battery before performing this inspection.

    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. B051052E14

        Waveform 1 (Reference)

        Table 3. Measurement Condition

        Item

        Content

        Tester Connection

        G24-9 (TXCT) - G24-8 (AGND)

        Tool Setting

        2 V/DIV., 20 ms./DIV.

        Condition

        After engine switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed
      2. B251418C02

        *a

        Key held against engine switch

        Waveform 2 (Reference)

        Table 4. Measurement Condition

        Item

        Content

        Tester Connection

        G24-10 (CODE) - G24-8 (AGND)

        Tool Setting

        1 V/DIV., 200 ms./DIV.

        Condition

        After engine switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed, and then key held against engine switch*
        Tip:

        *: Remove the key battery before performing this inspection.

      3. B216007N01

        Waveform 3 (Reference)

        Table 5. Measurement Condition

        Item

        Content

        Tester Connection

        G24-14 (VC5) - G24-8 (AGND)

        Tool Setting

        2 V/DIV., 200 ms./DIV.

        Condition

        After engine switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed

  2. CHECK CERTIFICATION ECU

    B203498N04

    1. Disconnect the G26 ECU 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

      G26-1 (+B) - G26-15 (E)

      Input

      V - W-B

      +B power supply

      Always

      11 to 14 V

      -

      G26-17 (CUTB) - G26-15 (E)

      Input

      L - W-B

      Dark current cut pin*

      Always

      11 to 14 V

      -

      G26-15 (E) - Body ground

      -

      W-B - Body ground

      Ground

      Always

      Below 1 Ω

      -

      • *: In order to prevent the battery from being depleted when the vehicle is shipped long distances, a fuse that cuts unnecessary electrical load while the vehicle is being shipped is set in the circuit. If the fuse is removed, the circuit becomes open. If the fuse between the battery and terminal CUTB is removed and the circuit is open, the certification ECU changes to a certain control mode (example: the transmission of electric waves every 250 ms. that form the detection area stops).

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

    3. Reconnect the G26 ECU connector.

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

      Table 6. Inspection with Engine Switch Off

      Terminal No. (Symbol)

      Input/Output

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      Related Data List Item/DTC

      G26-2 (IND) - G26-15 (E)

      Output

      G - W-B

      Security indicator output

      Engine switch off → on (IG)

      Pulse generation

      → Below 2 V

      -

      G26-12 (TXCT) - G26-36 (AGND)

      Output

      W - GR

      Signal output to transponder key amplifier

      Engine switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed

      Below 1 V

      • BCC Malfunction

      • Abnormal Status

      • Different Encrypt Code

      • Different Serial Number

      G26-13 (CODE) - G26-36 (AGND)

      Input

      V - GR

      Signal input from transponder key amplifier

      Engine switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed

      Below 1 V

      G26-16 (IG) - G26-15 (E)

      Input

      W - W-B

      Ignition power supply

      Engine switch off → on (IG)

      Below 1 V → 11 to 14 V

      Ignition Switch

      G26-28 (VC5) - G26-36 (AGND)

      Output

      P - GR

      Transponder key amplifier power supply

      Engine switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed

      Below 1 V

      • BCC Malfunction

      • Abnormal Status

      • Different Encrypt Code

      • Different Serial Number

      G26-36 (AGND) - Body ground

      -

      GR - Body ground

      Transponder key amplifier ground

      Always

      Below 1 Ω
      Table 7. Inspection of Waveforms of Communication Signals between Engine Switch and Certification ECU

      Terminal No. (Symbol)

      Input/Output

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      Related Data List Item/DTC

      G26-12 (TXCT) - G26-36 (AGND)

      Output

      W - GR

      Signal output to transponder key amplifier

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

      After engine switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed

      Pulse generation

      (See waveform 1)

      • BCC Malfunction

      • Abnormal Status

      • Different Encrypt Code

      • Different Serial Number

      G26-13 (CODE) - G26-36 (AGND)

      Input

      V - GR

      Signal input from transponder key amplifier

      (Electric waves from transponder key amplifier built into engine switch used to detect key information. Information then sent to certification ECU)

      After engine switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed, and then key held against engine switch*

      Pulse generation

      (See waveform 2)

      G26-28 (VC5) - G26-36 (AGND)

      Output

      P - GR

      Transponder key amplifier power supply

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

      After engine switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed

      Pulse generation

      (See waveform 3)
      Tip:

      *: Remove the key battery before performing this inspection.

    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. B051052N13

        Waveform 1 (Reference)

        Table 8. Measurement Condition

        Item

        Content

        Tester Connection

        G26-12 (TXCT) - G26-36 (AGND)

        Tool Setting

        2 V/DIV., 20 ms./DIV.

        Condition

        After engine switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed
      2. B251418C03

        *a

        Key held against engine switch

        Waveform 2 (Reference)

        Table 9. Measurement Condition

        Item

        Content

        Tester Connection

        G26-13 (CODE) - G26-36 (AGND)

        Tool Setting

        1 V/DIV., 200 ms./DIV.

        Condition

        After engine switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed, and then key held against engine switch*
        Tip:

        *: Remove the key battery before performing this inspection.

      3. B216007N02

        Waveform 3 (Reference)

        Table 10. Measurement Condition

        Item

        Content

        Tester Connection

        G26-28 (VC5) - G26-36 (AGND)

        Tool Setting

        2 V/DIV., 200 ms./DIV.

        Condition

        After engine switch turned off, within 30 seconds of any door opened and closed, or brake pedal depressed

  3. CHECK ID CODE BOX

    B118534N02

    1. Disconnect the G25 box 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

      G25-1 (+B) - G25-8 (GND)

      Input

      V - W-B

      +B power supply

      Always

      11 to 14 V

      B2789

      G25-8 (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 G25 box connector.

    4. Measure the 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

      G25-5 (EFII) - G25-8 (GND)

      Input

      SB - W-B

      EFI communication input

      (Signal input from ECM to ID code box)

      Engine switch off

      11 to 14 V

      • B2799

      • B279A

      • Engine Start Request

      • EFI Code Receive

      G25-5 (EFII) - G25-8 (GND)

      Input

      SB - W-B

      EFI communication input

      (Signal input from ECM to ID code box)

      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)

      G25-6 (EFIO) - G25-8 (GND)

      Output

      W - W-B

      EFI communication output

      (Signal output from ID code box to ECM)

      Engine switch off

      11 to 14 V

      G25-6 (EFIO) - G25-8 (GND)

      Output

      W - W-B

      EFI communication output

      (Signal output from ID code box to ECM)

      Engine switch on (IG)

      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)

        B253467C02

        *a

        Approximately 160 ms

        *b

        Approximately 510 ms
        Table 11. Measurement Condition

        Item

        Content

        Tester Connection

        G25-5 (EFII) - G25-8 (GND)

        Tool Setting

        2 V/DIV., 200 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)

        B253466C02

        *a

        Approximately 160 ms

        *b

        Approximately 510 ms
        Table 12. Measurement Condition

        Item

        Content

        Tester Connection

        G25-6 (EFIO) - G25-8 (GND)

        Tool Setting

        2 V/DIV., 200 ms./DIV.

        Condition

        Engine switch on (IG)

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

    C104383N81

    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

      G23-1 (GND) - Body ground

      -

      W-B - Body ground

      Ground

      Always

      Below 1 Ω

      -

      G23-3 (IGE) - Body ground

      Input

      W - Body ground

      Steering lock motor operation permission signal (motor operation permission signal supplied by power management control ECU)

      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

      • Power Supply Open

      • Unlock Request Receive

      • Lock Request Receive

      G23-4 (SLP1) - Body ground

      Output

      SB - Body ground

      Steering lock bar position signal (signal output from steering unlock sensor)

      Steering locked → unlocked*1

      10 to 14 V → Below 1.2 V

      • Push Start Error

      • Sensor Value

      G23-6 (IG2) - Body ground

      Input

      W - Body ground

      IG signal (IG2 power supply input for steering lock motor)

      Engine switch off → on (IG)

      Below 1 V → 11 to 14 V

      • B2788*2

      • Ignition Switch

      • IG2 Status

      G23-7 (B) - Body ground

      Output

      G - Body ground

      Constant power supply

      Always

      11 to 14 V

      B2788*2
      Tip:

      • *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: This DTC indicates an IG2 input malfunction. If the power source mode recognized by the power management control ECU and the power source mode recognized by the steering lock ECU do not match, this DTC is stored.

    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. C221561C03

        *a

        Steering lock motor not operating

        *b

        Steering lock motor operating

        Waveform 1 (Reference)

        Table 13. Measurement Condition

        Item

        Content

        Tester Connection

        G23-3 (IGE) - Body ground

        Tool Setting

        2 V/DIV., 20 ms./DIV.

        Condition

        Steering lock motor not operating*a ←→ operating*b

  5. CHECK ECM

    C216694N05

    1. Measure the 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

      C30-12 (E1) - Body ground

      -

      BR - Body ground

      Ground

      Always

      Below 1 Ω

      -

      G44-24 (BATT) - C30-12 (E1)

      Input

      L - BR

      +B power supply

      Always

      11 to 14 V

      -

      G44-23 (+B2) - C30-12 (E1)

      Input

      W - BR

      +B power supply

      Engine switch on (IG)

      11 to 14 V

      -

      G44-22 (+B) - C30-12 (E1)

      Input

      W - BR

      +B power supply

      Engine switch on (IG)

      11 to 14 V

      -

      G45-20 (IMO) - C30-12 (E1)

      Input

      SB - BR

      Communication input from ID code box

      Engine switch off

      11 to 14 V

      -

      G45-20 (IMO) - C30-12 (E1)

      Input

      SB - BR

      Communication input from ID code box

      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)

      -

      G45-14 (IMI) - C30-12 (E1)

      Output

      W - BR

      Communication output to ID code box

      Engine switch off

      11 to 14 V

      -

      G45-14 (IMI) - C30-12 (E1)

      Output

      W - BR

      Communication output to ID code box

      Engine switch on (IG)

      Pulse generation

      (See waveform 2)

      -

    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. Waveform 1 (Reference)

        B253467C03

        *a

        Approximately 160 ms

        *b

        Approximately 510 ms
        Table 14. Measurement Condition

        Item

        Content

        Tester Connection

        G45-20 (IMO) - C30-12 (E1)

        Tool Setting

        2 V/DIV., 200 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)

        B253466C03

        *a

        Approximately 160 ms

        *b

        Approximately 510 ms
        Table 15. Measurement Condition

        Item

        Content

        Tester Connection

        G45-14 (IMI) - C30-12 (E1)

        Tool Setting

        2 V/DIV., 200 ms./DIV.

        Condition

        Engine switch on (IG)