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


  1. CHECK TRANSPONDER KEY AMPLIFIER


    1. Disconnect the I34 transponder key amplifier connector.

      A01EV65E06

    2. Measure the resistance 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
      I34-7 (AGND) - Body ground V - 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 I34 transponder key amplifier 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
      I34-1 (VC5) - I34-7 (AGND) LG - V Power source No key in ignition key cylinder Below 1 V
      I34-1 (VC5) - I34-7 (AGND) LG - V Power source Key in ignition key cylinder 4.6 to 5.4 V
      I34-4 (CODE) - I34-7 (AGND) SB - V Demodulated signal of key code data No key in ignition key cylinder Below 1 V
      I34-4 (CODE) - I34-7 (AGND) SB - V Demodulated signal of key code data Key in ignition key cylinder

      Pulse generation

      (See waveform 1)
      I34-5 (TXCT) - I34-7 (AGND) R - V Key code output signal No key in ignition key cylinder Below 1 V
      I34-5 (TXCT) - I34-7 (AGND) R - V Key code output signal Key in ignition key cylinder

      Pulse generation

      (See waveform 2)

      If the result is not as specified, the transponder key amplifier may have a malfunction.

    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. A01EVLUE02

        Waveform 1 (Reference)

        Tester Connection I34-4 (CODE) - I34-7 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Key in ignition key cylinder
      2. A01EWCLE02

        Waveform 2 (Reference)

        Tester Connection I34-5 (TXCT) - I34-7 (AGND)
        Tool Setting 2 V/DIV., 10 ms./DIV.
        Condition Key in ignition key cylinder

  2. CHECK TRANSPONDER KEY ECU ASSEMBLY


    1. Disconnect the I19 transponder key ECU assembly connector.

      A01EX33E02

    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) - I19-16 (GND) W - BR Battery Always 11 to 14 V
      I19-2 (IG) - I19-16 (GND) R - BR Ignition switch signal Ignition switch off Below 1 V
      I19-2 (IG) - I19-16 (GND) R - BR Ignition switch signal Ignition switch ON 11 to 14 V
      I19-3 (KSW) - I19-16 (GND) G - BR Unlock warning switch signal No key in ignition key cylinder 10 kΩ or higher
      I19-3 (KSW) - I19-16 (GND) G - BR Unlock warning switch signal Key in ignition key cylinder Below 1 Ω
      I19-16 (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
      I19-3 (KSW) - I19-16 (GND) G - BR Unlock warning switch signal No key in ignition key cylinder 11 to 14 V
      I19-3 (KSW) - I19-16 (GND) G - BR Unlock warning switch signal Key in ignition key cylinder Below 1 V
      I19-4 (TXCT) - I19-5 (AGND) R - V Transponder key amplifier communication signal No key in ignition key cylinder Below 1 V
      I19-4 (TXCT) - I19-5 (AGND) R - V Transponder key amplifier communication signal Key in ignition key cylinder

      Pulse generation

      (See waveform 1)
      I19-5 (AGND) - Body ground V - Body ground Ground Always Below 1 Ω
      I19-8 (IND) - I19-16 (GND) L - BR Security indicator signal No key in ignition key cylinder, or 20 sec. elapsed after turning the ignition switch to on (ACC) or off (engine immobiliser system set) Pulse generation
      I19-8 (IND) - I19-16 (GND) L - BR Security indicator signal Key in ignition key cylinder (engine immobiliser system unset) Below 1 V
      I19-9 (D) - I19-16 (GND) GR - BR DLC3 communication Without communication Below 1 V
      I19-9 (D) - I19-16 (GND) GR - BR DLC3 communication During communication Pulse generation
      I19-12 (EFII) - I19-16 (GND) R - BR ECM input signal Ignition switch off 11 to 14 V
      I19-12 (EFII) - I19-16 (GND) R - BR ECM input signal Within 3 seconds after starter operates and initial combustion occurs, or within 3 seconds after ignition switch first turned to ON after battery disconnected and connected.

      Pulse generation

      (See waveform 2)
      I19-13 (EFIO) - I19-16 (GND) G - BR ECM output signal Ignition switch off Below 1 V
      I19-13 (EFIO) - I19-16 (GND) G - BR ECM output signal Within 3 seconds after starter operates and initial combustion occurs, or within 3 seconds after ignition switch first turned to ON after battery disconnected and connected.

      Pulse generation

      (See waveform 3)
      I19-14 (VC5) - I19-5 (AGND) LG - V Transponder key amplifier power source No key in ignition key cylinder Below 1 V
      I19-14 (VC5) - I19-5 (AGND) LG - V Transponder key amplifier power source Key in ignition key cylinder 4.6 to 5.4 V
      I19-15 (CODE) - I19-5 (AGND) SB - V Transponder key amplifier communication signal No key in ignition key cylinder Below 1 V
      I19-15 (CODE) - I19-5 (AGND) SB - V Transponder key amplifier communication signal Key in ignition key cylinder

      Pulse generation

      (See waveform 4)

      If the result is not as specified, the transponder key ECU assembly may have a malfunction.

    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. A01EWCLE02

        Waveform 1 (Reference)

        Tester Connection I19-4 (TXCT) - I19-5 (AGND)
        Tool Setting 2 V/DIV., 10 ms./DIV.
        Condition Key in ignition key cylinder

      2. Waveform 2 (Reference)

        A01EYV3E01
        Text in Illustration
        *a Approximately 160 ms *b Approximately 270 ms
        Tester Connection I19-12 (EFII) - I19-16 (GND)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds after starter operates and initial combustion occurs, or within 3 seconds after ignition switch first turned to ON after battery disconnected and connected.

      3. Waveform 3 (Reference)

        A01EU6HE01
        Text in Illustration
        *a Approximately 160 ms *b Approximately 270 ms
        Tester Connection I19-13 (EFIO) - I19-16 (GND)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds after starter operates and initial combustion occurs, or within 3 seconds after ignition switch first turned to ON after battery disconnected and connected.
      4. A01EVLUE02

        Waveform 4 (Reference)

        Tester Connection I19-15 (CODE) - I19-5 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Key in ignition key cylinder

  3. CHECK ECM

    A01EU6WE19

    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 after starter operates and initial combustion occurs, or within 3 seconds after ignition switch first turned to ON after battery disconnected and connected.

    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 after starter operates and initial combustion occurs, or within 3 seconds after ignition switch first turned to ON after battery disconnected and connected.

    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)

        A01EYV3E01
        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 after starter operates and initial combustion occurs, or within 3 seconds after ignition switch first turned to ON after battery disconnected and connected.

      2. Waveform 2 (Reference)

        A01EU6HE01
        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 after starter operates and initial combustion occurs, or within 3 seconds after ignition switch first turned to ON after battery disconnected and connected.