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


  1. CHECK TRANSPONDER KEY AMPLIFIER

    A002OCBE02

    1. Disconnect the H44 amplifier connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      H44-7 (AGND) - Body ground R - 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 H44 amplifier connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      H44-1 (VC5) - H44-7 (AGND) BE - R Power supply No key in ignition key cylinder Below 1 V
      Key inserted in ignition key cylinder 4.6 to 5.4 V
      H44-4 (CODE) - H44-7 (AGND) GR - R 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)
      H44-5 (TXCT) - H44-7 (AGND) G - R Key code output signal No key in ignition key cylinder Below 1 V
      Key inserted in ignition key cylinder Pulse generation (see waveform 2)

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

    5. A002LPLE01

      Inspect using an oscilloscope.


      1. Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection H44-4 (CODE) - H44-7 (AGND)
        Tool Setting 5 V/DIV., 20 msec./DIV.
        Condition Key inserted in ignition key cylinder
      2. A002PMYE01

        Waveform 2 (Reference)

        Measurement Condition
        Item Content
        Tester Connection H44-5 (TXCT) - H44-7 (AGND)
        Tool Setting 5 V/DIV., 20 msec./DIV.
        Condition Key inserted in ignition key cylinder

  2. CHECK TRANSPONDER KEY ECU

    A002PKIE01

    1. Disconnect the H110 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
      H110-16 (GND) - Body ground BR - Body ground Ground Always Below 1 Ω
      H110-1 (+B) - H110-16 (GND) W - BR Battery Always 11 to 14 V
      H110-2 (IG) - H110-16 (GND) B - BR Ignition switch Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      H110-3 (KSW) - H110-16 (GND) L - BR Unlock warning switch No key in ignition key cylinder 10 kΩ or higher
      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 H110 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
      H110-14 (VC5) - H110-16 (GND) BE - BR Power source No key in ignition key cylinder Below 1 V
      Key inserted in ignition key cylinder 4.6 to 5.4 V
      H110-7 (CTY) - H110-16 (GND) BR - BR Front door courtesy light switch (for Driver Side) Driver door closed 10 kΩ or higher
      Driver door open Below 1 Ω
      H110-4 (TXCT) - H110-16 (GND) G - BR Transponder key amplifier communication signal No key in ignition key cylinder Below 1 V
      Key inserted in ignition key cylinder Pulse generation (see waveform 1)
      H110-15 (CODE) - H110-16 (GND) GR - BR Transponder key amplifier communication signal No key in ignition key cylinder Below 1 V
      Key inserted in ignition key cylinder Pulse generation (see waveform 2)
      H110-13 (EFIO) - H110-16 (GND) P - BR ECM output signal Ignition switch off Below 1 V
      Ignition switch ON Pulse generation (see waveform 3)
      H110-12 (EFII) - H110-16 (GND) LG - BR ECM input signal Always Pulse generation (see waveform 4)
      H110-8 (IND) - H110-16 (GND) Y - BR Security indicator light signal Immobiliser set Alternating between 11 to 14 V and below 1 V
      Immobiliser unset Below 1 V
      H110-9 (D) - H110-16 (GND) SB - BR Diagnosis tester communication Always Pulse generation
      H110-5 (AGND) - Body ground R - Body ground Ground Always Below 1 Ω

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

    5. A002QFWE01

      Inspect using an oscilloscope.


      1. Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection H110-4 (TXCT) - H110-16 (GND)
        Tool Setting 5 V/DIV., 20 msec./DIV.
        Condition Key inserted in ignition key cylinder
      2. A002NAUE01

        Waveform 2 (Reference)

        Measurement Condition
        Item Content
        Tester Connection H110-15 (CODE) - H110-16 (GND)
        Tool Setting 5 V/DIV., 20 msec./DIV.
        Condition Key inserted in ignition key cylinder
      3. A002PIUE01

        Waveform 3 (Reference)

        Measurement Condition
        Item Content
        Tester Connection H110-13 (EFIO) - H110-16 (GND)
        Tool Setting 10 V/DIV., 100 msec./DIV.
        Condition Ignition switch ON
      4. A002QASE01

        Waveform 4 (Reference)

        Measurement Condition
        Item Content
        Tester Connection H110-12 (EFII) - H110-16 (GND)
        Tool Setting 10 V/DIV., 100 msec./DIV.
        Condition Always