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


  1. CHECK ENGINE SWITCH

    A0156QOE17

    1. Disconnect the E18 switch connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E18-5 (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 E18 switch 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
      E18-8 (AGND) - Body ground L - Body ground Ground Always Below 1 Ω
      E18-14 (VC5) - E18-8 (AGND) P - L Power supply Key not in cabin Below 1 V
      Engine switch pressed* 4.6 to 5.4 V
      E18-10 (CODE) - E18-8 (AGND) G - L Demodulated signal of key code output Key not in cabin Below 1 V
      Engine switch pressed and key held close to engine switch* Pulse generation (see waveform 1)
      E18-9 (TXCT) - E18-8 (AGND) SB - L Key code input signal Key not in cabin Below 1 V
      Engine switch pressed and key held close to engine switch* Pulse generation (see waveform 2)

      Tech Tips

      *: Remove the key battery before performing this inspection.


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

    5. A015CW0E01

      Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference)
      Item Content
      Terminal No. (Symbol) E18-10 (CODE) - E18-8 (AGND)
      Tool Setting 2 V/DIV., 20 msec./DIV.
      Condition Engine switch pressed and key held close to engine switch*

      Tech Tips

      *: Remove the key battery before performing this inspection.

    6. A0158SSE01

      Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference)
      Item Content
      Terminal No. (Symbol) E18-9 (TXCT) - E18-8 (AGND)
      Tool Setting 2 V/DIV., 20 msec./DIV.
      Condition Engine switch pressed and key held close to engine switch*

      Tech Tips

      *: Remove the key battery before performing this inspection.

  2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    A01574SE47

    1. Disconnect the E29 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
      E29 -17 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E29-1 (+B) - E29-17 (E) B - W-B +B power supply Always 11 to 14 V
      E29-18 (IG) - E29-17 (E) B - W-B Ignition power supply Engine switch off Below 1 V
      Engine switch on 11 to 14 V

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

    3. Reconnect the E29 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
      E29-40 (AGND) - Body ground L - Body ground Engine switch ground Always Below 1 Ω
      E29-30 (VC5) - E29-40 (AGND) P - L Engine switch power supply Key not in cabin Below 1 V
      Engine switch pressed* 4.6 to 5.4 V
      E29-9 (CODE) - E29-40 (AGND) G- L Engine switch CODE input Key not in cabin Below 1 V
      Engine switch pressed and key held close to engine switch* Pulse generation (see waveform 1)
      E29-8 (TXCT) - E29-40 (AGND) SB - L Engine switch TX output Key not in cabin Below 1 V
      Engine switch pressed and key held close to engine switch* Pulse generation (see waveform 2)

      Tech Tips

      *: Remove the key battery before performing this inspection.


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

    5. A015CW0E01

      Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference)
      Item Content
      Terminal No. (Symbol) E29-9 (CODE) - E29-40 (AGND)
      Tool Setting 2 V/DIV., 20 msec./DIV.
      Condition Engine switch pressed and key held close to engine switch*

      Tech Tips

      *: Remove the key battery before performing this inspection.

    6. A0158SSE01

      Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference)
      Item Content
      Terminal No. (Symbol) E29-8 (TXCT) - E29-40 (AGND)
      Tool Setting 2 V/DIV., 20 msec./DIV.
      Condition Engine switch pressed and key held close to engine switch*

      Tech Tips

      *: Remove the key battery before performing this inspection.

  3. CHECK ID CODE BOX (IMMOBILISER CODE ECU)

    A0157QGE03

    1. Disconnect the E28 box 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
      E28-8 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E28-1 (+B) - E28-8 (GND) B - W-B +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 E28 box connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E28-5 (EFII) - E28-8 (GND) W - W-B ECM input signal Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation (see waveform 1)
      E28-6 (EFIO) - E28-8 (GND) R - W-B ECM output signal Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation (see waveform 2)

      • If the result is not as specified, the ID code box (immobiliser code ECU) may have a malfunction.

    5. A015E0ZE01

      Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference)
      Item Content
      Terminal No. (Symbol) E28-5 (EFII) - E28-8 (GND)
      Tool Setting 10 V/DIV., 100 msec./DIV.
      Condition Engine switch on (IG)
    6. A0158NFE01

      Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference)
      Item Content
      Terminal No. (Symbol) E28-6 (EFIO) - E28-8 (GND)
      Tool Setting 10 V/DIV., 100 msec./DIV.
      Condition Engine switch on (IG)

  4. CHECK MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

    A015ABQE01

    1. Disconnect the 2D and 2A ECU connectors.

    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
      2D-62 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      2D-8 (ACC) - 2D-62 (GND2) GR - W-B ACC power supply Engine switch off Below 1 V
      Engine switch on (ACC) 11 to 14 V
      2A-1 (IG) - 2D-62 (GND2) B - W-B IG power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V

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

  5. CHECK STEERING LOCK ACTUATOR (STEERING LOCK ECU)

    A01570GE28

    1. Disconnect the E26 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
      E26-2 (SGND) - Body ground BR - Body ground Ground Always Below 1 Ω
      E26-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E26-7 (B) - Body ground R - Body ground +B power supply Always 11 to 14 V
      E26-6 (IG2) - Body ground B - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V

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