ENGINE IMMOBILISER SYSTEM TERMINALS OF ECU


  1. CHECK TRANSPONDER KEY AMPLIFIER


    1. A01CJ6WE04

      Disconnect the T17 transponder key amplifier connector.

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

      Inspection with Ignition Switch Off
      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      T17-7 (AGND) - Body ground - L - 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 T17 transponder key amplifier connector.

    4. Measure the voltage according to the value(s) in the table below.

      Inspection of Waveforms of Communication Signals between Transponder Key Amplifier and Transponder Key ECU Assembly
      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      T17-1 (VC5) - T17-7 (AGND) Input V - L Transponder key amplifier power supply No key in ignition key cylinder → Key inserted in ignition key cylinder 0 V → Below 5.4 V → 0 V

      • BCC Malfunction

      • Abnormal Status

      • Different Encrypt Code

      • Different Serial Number

      (If immobiliser key code certification communication is not performed correctly, the malfunction may be indicated by one or more of the Data List items listed above)
      T17-4 (CODE) - T17-7 (AGND) Output LG - L Demodulated signal of key code data No key in ignition key cylinder Below 1 V
      Key inserted in ignition key cylinder Pulse generation (See waveform 1)
      T17-5 (TXCT) - T17-7 (AGND) Input P - L Key code output signal No key in ignition key cylinder Below 1 V
      Key inserted in ignition key cylinder Pulse generation (See waveform 2)
    5. A01CGYTE01

      Inspect using an oscilloscope.

      Tech Tips

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.


      1. Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection T17-4 (CODE) - T17-7 (AGND)
        Tool Setting 2.5 V/DIV., 20 ms./DIV.
        Condition Key inserted in ignition key cylinder
      2. A01CI50E01

        Waveform 2 (Reference)

        Measurement Condition
        Item Content
        Tester Connection T17-5 (TXCT) - T17-7 (AGND)
        Tool Setting 2.5 V/DIV., 20 ms./DIV.
        Condition Key inserted in ignition key cylinder

  2. CHECK TRANSPONDER KEY ECU ASSEMBLY


    1. A01CJFFE05

      Disconnect the T18 transponder key ECU assembly connector.

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

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      T18-16 (GND) - Body ground - W-B - Body ground Ground Always Below 1 Ω -
      T18-5 (AGND) - T18-16 (GND) - L - W-B Transponder key amplifier ground Always Below 1 Ω -
      T18-1 (+B) - T18-16 (GND) Input LG - W-B Battery Always 10 to 16 V +B
      T18-2 (IG) - T18-16 (GND) Input W - W-B Ignition switch Ignition switch off 0 V IG SW
      Ignition switch ON 10 to 16 V
      T18-3 (KSW) - T18-16 (GND) Input SB - W-B Unlock warning switch No key in ignition key cylinder 10 kΩ or higher Key SW/B2780
      Key inserted in ignition key cylinder Below 1 Ω

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

    3. Reconnect the T18 transponder key ECU assembly connector.

    4. Measure the voltage according to the value(s) in the table below.

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      T18-14 (VC5) - T18-16 (GND) Input V - W-B Transponder key amplifier power supply No key in ignition key cylinder → Key inserted in ignition key cylinder 0 V → Below 5.4 V → 0 V

      • BCC Malfunction

      • Abnormal Status

      • Different Encrypt Code

      • Different Serial Number

      (If immobiliser key code certification communication is not performed correctly, the malfunction may be indicated by one or more of the Data List items listed above)
      T18-4 (TXCT) - T18-16 (GND) Input P - W-B Key code output signal No key in ignition key cylinder Below 1 V
      Key inserted in ignition key cylinder Pulse generation (See waveform 1)
      T18-15 (CODE) - T18-16 (GND) Output LG - W-B Demodulated signal of key code data No key in ignition key cylinder Below 1 V
      Key inserted in ignition key cylinder Pulse generation (See waveform 2)
      T18-13 (EFIO) - T18-16 (GND) Input GR - W-B ECM output signal Ignition switch off Below 1 V E/G Start Permission
      Ignition switch ON Pulse generation (See waveform 3)
      T18-12 (EFII) - T18-16 (GND) Output Y - W-B 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 reconnected Pulse generation (See waveform 4) E/G Start Permission
      T18-3 (KSW) - T18-16 (GND) Input SB - W-B Unlock warning switch No key in ignition key cylinder 10 to 16 V Key SW/B2780
      Key inserted in ignition key cylinder 0 V
    5. A01CI50E01

      Inspect using an oscilloscope.

      Tech Tips

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.


      1. Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection T18-4 (TXCT) - T18-16 (GND)
        Tool Setting 2.5 V/DIV., 20 ms./DIV.
        Condition Key inserted in ignition key cylinder
      2. A01CGYTE01

        Waveform 2 (Reference)

        Measurement Condition
        Item Content
        Tester Connection T18-15 (CODE) - T18-16 (GND)
        Tool Setting 2.5 V/DIV., 20 ms./DIV.
        Condition Key inserted in ignition key cylinder
      3. A01CHL4E01

        Waveform 3 (Reference)

        Measurement Condition
        Item Content
        Tester Connection T18-13 (EFIO) - T18-16 (GND)
        Tool Setting 5 V/DIV., 100 ms./DIV.
        Condition Ignition switch ON
      4. A01CH5JE01

        Waveform 4 (Reference)

        Measurement Condition
        Item Content
        Tester Connection T18-12 (EFII) - T18-16 (GND)
        Tool Setting 5 V/DIV., 100 ms./DIV.
        Condition Key inserted in ignition key cylinder

  3. CHECK ECM

    A01CI3NE02

    1. Measure the voltage according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E40-15 (IMO) - Body ground Y - Body ground Transponder key ECU assembly output signal Within 3 seconds after starter operates and initial combustion occurs, or within 3 seconds after ignition switch first turned ON after battery disconnected and reconnected Pulse generation (See waveform 1)
      E40-9 (IMI) - Body ground GR -Body ground Transponder key ECU assembly input signal Ignition switch off Below 1 V
      Ignition switch ON Pulse generation (See waveform 2)

    2. Inspect using an oscilloscope.

      Tech Tips

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.


      1. A01CH5JE01

        Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection E40-15 (IMO) - Body ground
        Tool Setting 5 V/DIV., 100 ms./DIV.
        Condition Key inserted in ignition key cylinder
      2. A01CHL4E01

        Waveform 2 (Reference)

        Measurement Condition
        Item Content
        Tester Connection E40-9 (IMI) - Body ground
        Tool Setting 5 V/DIV., 100 ms./DIV.
        Condition Ignition switch ON