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

  1. CHECK ENGINE SWITCH

    U122353E02

    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

      Tip:

      *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. B051052E57

        Waveform 1 (Reference)

        Table 1. 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. B051053E30

        Waveform 2 (Reference)

        Table 2. 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*
        Tip:

        *: Remove the key battery before performing this inspection.

      3. B216007E01

        Waveform 3 (Reference)

        Table 3. 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

    U122390E03

    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

      Tip:

      *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. B051052E58

        Waveform 1 (Reference)

        Table 4. 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. B051053E31

        Waveform 2 (Reference)

        Table 5. 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*
        Tip:

        *: Remove the key battery before performing this inspection.

      3. B216007E14

        Waveform 3 (Reference)

        Table 6. 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

    U122348E02

    1. Disconnect the H111 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

      H111-1 (+B) - H111-8 (GND)

      W - BR

      +B power supply

      Always

      11 to 14 V

      H111-8 (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 H111 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

      H111-5 (EFII) - H111-8 (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)

      H111-6 (EFIO) - H111-8 (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. B215182E02

        Waveform 1 (Reference)

        Table 7. Measurement Condition

        Item

        Content

        Tester Connection

        H111-5 (EFII) - H111-8 (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. B139210E04

        Waveform 2 (Reference)

        Table 8. Measurement Condition

        Item

        Content

        Tester Connection

        H111-6 (EFIO) - H111-8 (GND)

        Tool Setting

        10 V/DIV., 100 ms./DIV.

        Condition

        Engine switch on (IG)

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

    U122578E02

    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

    U122963E02

    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.