BLOCKING SYSTEM TERMINALS OF ECU


  1. CHECK TELEPHONE TRANSCEIVER ASSEMBLY

    B003W35N02

    1. Disconnect the K76 telephone transceiver assembly connector.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      K76-6 (IG2) - K76-9 (E) W - BR Ignition power supply Engine switch off Below 1 V
      K76-6 (IG2) - K76-9 (E) W - BR Ignition power supply Engine switch on (IG) 9 to 16 V
      K76-12 (+B) - K76-9 (E) P - BR +B power supply Always 9 to 16 V
      K76-9 (E) - 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 K76 telephone transceiver assembly connector.

    4. Measure the voltage and check for pulses according to the value(s) in the table below.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      K76-1 (BLK1) - K76-9 (E) W - BR ID code box (immobiliser code ECU) communication output Engine switch off 11 to 14 V
      K76-1 (BLK1) - K76-9 (E) W - BR ID code box (immobiliser code ECU) 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 1)
      K76-2 (BLK4) - K76-9 (E) P - BR ID code box (immobiliser code ECU) communication input Engine switch off Below 1 V
      K76-2 (BLK4) - K76-9 (E) P - BR ID code box (immobiliser code ECU) 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 2)
      K76-7 (BLK2) - K76-9 (E) W - BR ECM communication input Engine switch off Below 1 V
      K76-7 (BLK2) - K76-9 (E) W - BR ECM 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)
      K76-8 (BLK3) - K76-9 (E) P - BR ECM communication output Engine switch off Below 1 V
      K76-8 (BLK3) - K76-9 (E) P - BR ECM 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)

      If the result is not as specified, the telephone transceiver assembly may be malfunctioning.

    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)

        B003TRLC04
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection

        • K76-1 (BLK1) - K76-9 (E)

        • K76-7 (BLK2) - K76-9 (E)
        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)

        B003V21C04
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection

        • K76-2 (BLK4) - K76-9 (E)

        • K76-8 (BLK3) - K76-9 (E)
        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. CHECK ID CODE BOX (IMMOBILISER CODE ECU)


    1. Disconnect the K83 ID code box (immobiliser code ECU) connector.

      B003UCTN19

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      K83-5 (GND) - Body ground BR - Body ground Ground Always Below 1 Ω
      K83-1 (+B) - K83-5 (GND) G - BR +B power supply Always 11 to 14 V

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

    3. Reconnect the K83 ID code box (immobiliser code ECU) connector.

    4. Measure the voltage and check for pulses according to the value(s) in the table below.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      K83-3 (EFII) - K83-5 (GND) W - BR ECM input signal Engine switch off 11 to 14 V
      K83-3 (EFII) - K83-5 (GND) W - BR ECM input signal 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)
      K83-4 (EFIO) - K83-5 (GND) P - BR ECM output signal Engine switch off 11 to 14 V
      K83-4 (EFIO) - K83-5 (GND) P - BR ECM output signal 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)

      If the result is not as specified, the ID code box (immobiliser code ECU) may be malfunctioning.

    5. Inspect using an oscilloscope.


      1. Waveform 1 (Reference)

        B003TRLC04
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection K83-3 (EFII) - K83-5 (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)

        B003V21C04
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection K83-4 (EFIO) - K83-5 (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

  3. CHECK ECM

    B003X5KN05

    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 or resistance 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.


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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      F4-1 (E1) - Body ground BR - Body ground Ground Always Below 1 Ω
      F2-2 (E01) - Body ground W-B - Body ground Ground Always Below 1 Ω
      F2-1 (E02) - Body ground W-B - Body ground Ground Always Below 1 Ω
      F1-1 (+BM) - F4-1 (E1) P - BR +B power supply Always 11 to 14 V
      A76-7 (BATT) - F4-1 (E1) L - BR +B power supply Always 11 to 14 V
      A77-2 (+B) - F4-1 (E1) B-R - BR Power source of ECM Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A77-1 (+B2) - F4-1 (E1) B-R - BR Power source of ECM Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A76-3 (MREL) - F2-2 (E01) Y - W-B Power source of ECM Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A77-30 (IMO) - F4-1 (E1) W - BR ID code box (immobiliser code ECU) communication output Engine switch off 11 to 14 V
      A77-30 (IMO) - F4-1 (E1) W - BR ID code box (immobiliser code ECU) 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 1)
      A77-31 (IMI) - F4-1 (E1) P - BR ID code box (immobiliser code ECU) communication input Engine switch off 11 to 14 V
      A77-31 (IMI) - F4-1 (E1) P - BR ID code box (immobiliser code ECU) 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 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)

        B003TRLC04
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection A77-30 (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)

        B003V21C04
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection A77-31 (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