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


  1. CHECK ENGINE SWITCH

    A005U06E12

    1. Disconnect the D56 switch connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      D56-8 (AGND) - Body ground BR - 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 D56 switch connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      D56-9 (TXCT) - D56-8 (AGND) L - BR Key code output signal Engine switch off, 30 seconds or more after door opened or closed, and brake pedal*1 or clutch pedal*2 not depressed Below 1 V
      D56-9 (TXCT) - D56-8 (AGND) L - BR Key code output signal Engine switch off, key not in cabin, and 30 seconds or less after engine switch pushed

      Pulse generation

      (see waveform 1)

      D56-10 (CODE) - D56-8 (AGND) P - BR Demodulated signal of key code data Engine switch off, 30 seconds or more after door opened or closed, and brake pedal*1 or clutch pedal*2 not depressed Below 1 V
      D56-10 (CODE) - D56-8 (AGND) P - BR Demodulated signal of key code data Engine switch off, key held against the engine switch and engine switch pushed*3

      Pulse generation

      (see waveform 2)

      D56-11 (SWIL) - D56-8 (AGND) GR - BR Illumination signal Light control switch off → tail Below 2 V → 9 to 14 V
      D56-14 (VC5) - D56-8 (AGND) SB - BR Power supply Engine switch off, 30 seconds or more after door opened or closed, and brake pedal*1 or clutch pedal*2 not depressed Below 1 V
      D56-14 (VC5) - D56-8 (AGND) SB - BR Power supply Engine switch off, key not in cabin, and 30 seconds or less after engine switch pushed

      Pulse generation

      (see waveform 3)


      • *1: except Manual Transaxle

      • *2: for Manual Transaxle

      Tech Tips

      *3: Remove the key battery before performing this inspection.

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

    5. Inspect using an oscilloscope.


      1. A005VBWE14

        Waveform 1 (Reference)

        Item Content
        Tester Connection D56-9 (TXCT) - D56-8 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Engine switch off, key not in cabin, and 30 seconds or less after engine switch pushed
      2. A005W46E17

        Waveform 2 (Reference)

        Item Content
        Tester Connection D56-10 (CODE) - D56-8 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Engine switch off, key held against engine switch and engine switch pushed*

        Tech Tips

        *: Remove the key battery before performing this inspection.

      3. A005UV2E01

        Waveform 3 (Reference)

        Item Content
        Tester Connection D56-14 (VC5) - D56-8 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Engine switch off, key not in cabin, and 30 seconds or less after engine switch pushed
  2. CHECK CERTIFICATION ECU

    A005W07E06

    1. Disconnect the D54 ECU connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      D54-1 (+B) - D54-15 (E) R - W-B +B power supply Always 11 to 14 V
      D54-17 (CUTB) - D54-15 (E) W - W-B +B power supply Always 11 to 14 V
      D54-15 (E) - 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 D54 ECU connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      D54-2 (IND) - D54-15 (E) Y - W-B Security indicator output Engine switch off → on (IG)

      Pulse generation

      → Below 2 V

      D54-11 (SWIL) - D54-36 (AGND) GR - BR Illumination signal Light control switch off Below 2 V
      D54-11 (SWIL) - D54-36 (AGND) GR - BR Illumination signal Light control switch tail 9 to 14 V
      D54-12 (TXCT) - D54-36 (AGND) L - BR Engine switch TXCT output Engine switch off, 30 seconds or more after door opened or closed, and brake pedal*1 or clutch pedal*2 not depressed Below 1 V
      D54-12 (TXCT) - D54-36 (AGND) L - BR Engine switch TXCT output Engine switch off, key not in cabin, and 30 seconds or less after engine switch pushed

      Pulse generation

      (see waveform 1)

      D54-13 (CODE) - D54-36 (AGND) P - BR Engine switch CODE input Key not in cabin Below 1 V
      D54-13 (CODE) - D54-36 (AGND) P - BR Engine switch CODE input Engine switch off, key held against engine switch and engine switch pushed*3

      Pulse generation

      (see waveform 2)

      D54-16 (IG) - D54-15 (E) L - W-B Ignition power supply Engine switch off → on (IG) Below 1 V → 11 to 14 V
      D54-28 (VC5) - D54-36 (AGND) SB - BR Engine switch power supply Key not in cabin Below 1 V
      D54-28 (VC5) - D54-36 (AGND) SB - BR Engine switch power supply Engine switch off, key not in cabin, and 30 seconds or less after engine switch pushed

      Pulse generation

      (see waveform 3)

      D54-36 (AGND) - Body ground BR - Body ground Engine switch ground Always Below 1 Ω

      • *1: except Manual Transaxle

      • *2: for Manual Transaxle

      Tech Tips

      *3: Remove the key battery before performing this inspection.

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

    5. Inspect using an oscilloscope.


      1. A005VBWE01

        Waveform 1 (Reference)

        Item Content
        Tester Connection D54-12 (TXCT) - D54-36 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Engine switch off, key not in cabin, and 30 seconds or less after engine switch pushed
      2. A005W46E01

        Waveform 2 (Reference)

        Item Content
        Tester Connection D54-13 (CODE) - D54-36 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Engine switch off, key held against engine switch and engine switch pushed*

        Tech Tips

        *: Remove the key battery before performing this inspection.

      3. A005UV2E01

        Waveform 3 (Reference)

        Item Content
        Tester Connection D54-28 (VC5) - D54-36 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Engine switch off, key not in cabin, and 30 seconds or less after engine switch pushed
  3. CHECK ID CODE BOX

    A005T3TE15

    1. Disconnect the D26 box connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      D26-1 (+B) - D26-8 (GND) R - BR +B power supply Always 11 to 14 V
      D26-8 (GND) - Body ground BR - 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 D26 box connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      D26-5 (EFII) - D26-8 (GND) LG - BR ECM input signal 3 seconds or less after initial combustion, or 3 seconds or less after engine switch turned on (IG) for the first time after battery reconnected

      11 to 14 V → Pulse generation

      (see waveform 1)

      D26-6 (EFIO) - D26-8 (GND) P - BR ECM output signal Engine switch off → on (IG)

      11 to 14 V → Pulse generation

      (see waveform 2)

      If the result is not as specified, the ID code box may have a malfunction.

    5. Inspect using an oscilloscope.


      1. A005S3JE01

        Waveform 1 (Reference)

        Item Content
        Tester Connection D26-5 (EFII) - D26-8 (GND)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Condition 3 seconds or less after initial combustion, or 3 seconds or less after engine switch turned on (IG) for the first time after battery reconnected
      2. A005VBRE03

        Waveform 2 (Reference)

        Item Content
        Tester Connection D26-6 (EFIO) - D26-8 (GND)
        Tool Setting 10 V/DIV., 100 ms./DIV.
        Condition Engine switch off → on (IG)
  4. CHECK STEERING LOCK ECU (for Manual Tilt and Manual Telescopic Steering Column)

    A005UKAE09

    1. Disconnect the D57 steering lock ECU connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      D57-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      D57-6 (IG2) - D57-1 (GND) B - W-B IG2 signal input Engine switch off → on (IG) Below 1 V → 11 to 14 V
      D57-7 (B) - Body ground LG - Body ground Power source Always 11 to 14 V

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

  5. CHECK STEERING LOCK ECU (for Power Tilt and Power Telescopic Steering Column)

    A005RSBE02

    1. Disconnect the D108 steering lock ECU connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      D108-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      D108-7 (IG2) - D108-1 (GND) B - W-B IG2 signal input Engine switch off → on (IG) Below 1 V → 11 to 14 V
      D108-2 (B) - Body ground LG - Body ground Power source Always 11 to 14 V

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

  6. CHECK POWER MANAGEMENT CONTROL ECU

    A005U9OE09

    1. Disconnect the D75 ECU connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      D75-1 (AM22) - Body ground W - Body ground Battery power Always 11 to 14 V
      D75-2 (AM21) - Body ground W - Body ground Battery power Always 11 to 14 V
      D75-5 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      D75-6 (GND) - 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.