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


  1. CHECK ENGINE SWITCH

    A01IMZME15

    1. Disconnect the H53 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
      H53-8 (AGND) - Body ground BR - Body ground Ground Always Below 1 Ω
      H53-5 (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.

    3. Reconnect the H53 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
      H53-9 (TXCT) - H53-8 (AGND) B - 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
      H53-9 (TXCT) - H53-8 (AGND) B - 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)
      H53-10 (CODE) - H53-8 (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
      H53-10 (CODE) - H53-8 (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)
      H53-11 (SWIL) - H53-5 (GND) BE - W-B Illumination signal Light control switch off → tail Below 2 V → 9 to 14 V
      H53-14 (VC5) - H53-8 (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
      H53-14 (VC5) - H53-8 (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. A01IURNE14

        Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection H53-9 (TXCT) - H53-8 (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. A01INK5E17

        Waveform 2 (Reference)

        Measurement Condition
        Item Content
        Tester Connection H53-10 (CODE) - H53-8 (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. A01INADE01

        Waveform 3 (Reference)

        Measurement Condition
        Item Content
        Tester Connection H53-14 (VC5) - H53-8 (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

    A01IOA4E10

    1. Disconnect the H51 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
      H51-1 (+B) - H51-15 (E) W - W-B +B power supply Always 11 to 14 V
      H51-17 (CUTB) - H51-15 (E) W - W-B +B power supply Always 11 to 14 V
      H51-16 (IG) - H51-15 (E) L - W-B Ignition power supply Engine switch off → on (IG) Below 1 V → 11 to 14 V
      H51-15 (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 H51 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
      H51-2 (IND) - H51-15 (E) Y - W-B Security indicator output Engine switch off → on (IG)

      Pulse generation

      → Below 2 V
      H51-11 (SWIL) - H51-36 (AGND) BE - BR Illumination signal Light control switch off Below 2 V
      H51-11 (SWIL) - H51-36 (AGND) BE - BR Illumination signal Light control switch tail 9 to 14 V
      H51-12 (TXCT) - H51-36 (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
      H51-12 (TXCT) - H51-36 (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)
      H51-13 (CODE) - H51-36 (AGND) P - BR Engine switch CODE input Key not in cabin Below 1 V
      H51-13 (CODE) - H51-36 (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)
      H51-28 (VC5) - H51-36 (AGND) SB - BR Engine switch 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
      H51-28 (VC5) - H51-36 (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)
      H51-36 (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. A01IURNE01

        Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection H51-12 (TXCT) - H51-36 (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. A01INK5E01

        Waveform 2 (Reference)

        Measurement Condition
        Item Content
        Tester Connection H51-13 (CODE) - H51-36 (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. A01INADE01

        Waveform 3 (Reference)

        Measurement Condition
        Item Content
        Tester Connection H51-28 (VC5) - H51-36 (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

    A01IURCE18

    1. Disconnect the H35 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
      H35-1 (+B) - H35-8 (GND) W - BR +B power supply Always 11 to 14 V
      H35-8 (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 H35 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
      H35-5 (EFII) - H35-8 (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)
      H35-6 (EFIO) - H35-8 (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. A01IPDQE01

        Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection H35-5 (EFII) - H35-8 (GND)
        Tool Setting 10 V/DIV., 100 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. A01IO0VE03

        Waveform 2 (Reference)

        Measurement Condition
        Item Content
        Tester Connection H35-6 (EFIO) - H35-8 (GND)
        Tool Setting 10 V/DIV., 100 ms./DIV.
        Condition Engine switch on (IG)

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

    A01IRL7E10

    1. Disconnect the H54 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
      H54-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      H54-6 (IG2) - H54-1 (GND) B - W-B IG2 signal input Engine switch off → on (IG) Below 1 V → 11 to 14 V
      H54-7 (B) - Body ground L - 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 POWER MANAGEMENT CONTROL ECU

    A01IOLCE04

    1. Disconnect the H71 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
      H71-1 (AM22) - Body ground L - Body ground Battery power Always 11 to 14 V
      H71-2 (AM21) - Body ground B - Body ground Battery power Always 11 to 14 V
      H71-5 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      H71-6 (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.