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


  1. CHECK TRANSPONDER KEY ECU ASSEMBLY


    1. Disconnect the I19 transponder key ECU assembly connector.

      B000K2HE02

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

      Tech Tips

      Measure the values on the wire harness side with the connector disconnected.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      I19-1 (+B) - I19-5 (GND) W - BR Battery Always 11 to 14 V
      I19-2 (IG) - I19-5 (GND) R - BR Ignition switch signal Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      I19-3 (KSW) - I19-5 (GND) G - BR Unlock warning switch signal No door control transmitter assembly in ignition key cylinder 10 kΩ or higher
      Door control transmitter assembly in ignition key cylinder Below 1 Ω
      I19-5 (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 I19 transponder key ECU assembly connector.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      I19-8 (IND) - I19-5 (GND) L - BR Security indicator signal No door control transmitter assembly in ignition key cylinder, or 20 sec. elapsed after turning ignition switch to ACC or off (engine immobiliser system set) Pulse generation
      Door control transmitter assembly in ignition key cylinder (engine immobiliser system unset) Below 1 V
      I19-9 (D) - I19-5 (GND) GR - BR DLC3 communication Without communication Below 1 V
      During communication Pulse generation
      I19-4 (ANT1) - I19-5 (GND) LG - BR Transponder key amplifier power source No door control transmitter assembly in ignition key cylinder 4 to 6 V
      Within 3 seconds of inserting door control transmitter assembly into ignition key cylinder

      Pulse generation

      (See waveform 1)
      I19-9 (D) - I19-5 (GND) GR - BR Transponder key amplifier communication signal No door control transmitter assembly in ignition key cylinder 4 to 6 V
      Within 3 seconds of inserting door control transmitter assembly into ignition key cylinder

      Pulse generation

      (See waveform 2)
      I19-12 (EFII) - I19-5 (GND) R - BR ECM input signal Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal

      Pulse generation

      (See waveform 3)
      I19-13 (EFIO) - I19-5 (GND) G - BR ECM output signal Ignition switch off Below 1 V
      Ignition switch ON

      Pulse generation

      (See waveform 4)

      If the result is not as specified, the transponder key ECU assembly may be malfunctioning.

    5. Using an oscilloscope, check the waveform.


      1. Waveform 1 (Reference)

        B000LCCE07
        Tester Connection I19-4 (ANT1) - I19-5 (GND)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of inserting door control transmitter assembly into ignition key cylinder

      2. Waveform 2 (Reference)

        B000LRNE07
        Tester Connection I19-15 (ANT2) - I19-5 (GND)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of inserting door control transmitter assembly into ignition key cylinder

      3. Waveform 3 (Reference)

        B000KEGE04
        Text in Illustration
        *a Approximately 160 ms *b Approximately 270 ms
        Tester Connection I19-12 (EFII) - I19-5 (GND)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal

      4. Waveform 4 (Reference)

        B000I4ME04
        Text in Illustration
        *a Approximately 160 ms *b Approximately 270 ms
        Tester Connection I19-13 (EFIO) - I19-5 (GND)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Ignition switch ON

  2. CHECK ECM

    B000HECE19

    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.

    Tester Connection Wiring Color Terminal Description Condition Specified Condition
    E26-16 (E1) - Body ground BR - Body ground Ground Always Below 1 Ω
    A25-1 (BATT) - E26-16 (E1) GR - BR +B power supply Always 11 to 14 V
    A25-3 (+B2) - E26-16 (E1) LG - BR +B power supply Ignition switch ON 11 to 14 V
    A25-2 (+B) - E26-16 (E1) P - BR +B power supply Ignition switch ON 11 to 14 V
    A25-29 (IMO) - E26-16 (E1) G - BR Transponder key ECU assembly communication input Ignition switch off 11 to 14 V
    A25-29 (IMO) - E26-16 (E1) G - BR Transponder key ECU assembly communication input Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal

    Pulse generation

    (See waveform 1)
    A25-28 (IMI) - E26-16 (E1) Y - BR Transponder key ECU assembly communication output Ignition switch off Below 1 V
    A25-28 (IMI) - E26-16 (E1) Y - BR Transponder key ECU assembly communication output Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal

    Pulse generation

    (See waveform 2)

    1. 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)

        B000ID2E01
        Text in Illustration
        *a Approximately 160 ms *b Approximately 270 ms
        Tester Connection A25-29 (IMO) - E26-16 (E1)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal

      2. Waveform 2 (Reference)

        B000N5HE01
        Text in Illustration
        *a Approximately 160 ms *b Approximately 270 ms
        Tester Connection A25-28 (IMI) - E26-16 (E1)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal