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


  1. CHECK TRANSPONDER KEY ECU ASSEMBLY

    B003QCUE05

    1. Disconnect the G127 transponder key ECU assembly connector.

    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 Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item
      G127-5 (GND) - Body ground - BR - Body ground Ground Always Below 1 Ω -
      G127-1 (+B) - G127-5 (GND) Input L - BR Battery Always 11 to 14 V +B
      G127-2 (IG) - G127-5 (GND) Input P - BR Ignition switch Ignition switch off Below 1 V IG SW
      Ignition switch ON 11 to 14 V
      G127-3 (KSW) - G127-5 (GND) Input G - BR Unlock warning switch signal No key in ignition key cylinder 10 kΩ or higher Key SW/B2780
      Key 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 G127 transponder key ECU assembly connector.

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

      Tester Connection Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item
      G127-8 (IND) - G127-5 (GND) Output Y - BR Security indicator light signal No key in ignition key cylinder, or 20 seconds elapsed after turning ignition switch to ACC or off (immobiliser system set) Pulse generation Immobiliser
      Key in ignition key cylinder (immobiliser system unset) Below 1 V
      G127-9 (D) - G127-5 (GND) Input/Output R - BR DLC3 communication Without communication Below 1 V -
      During communication Pulse generation
      G127-4 (ANT1) - G127-5 (GND) Input/Output Y - BR Transponder key amplifier power source No key in ignition key cylinder 4 to 6 V -
      Within 3 seconds of inserting key into ignition key cylinder

      Pulse generation

      (See waveform 1)
      G127-15 (ANT2) - G127-5 (GND) Input/Output W - BR Transponder key amplifier communication signal No key in ignition key cylinder 4 to 6 V -
      Within 3 seconds of inserting key into ignition key cylinder

      Pulse generation

      (See waveform 2)
      G127-12 (EFII) - G127-5 (GND) Input Y - 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)

      		 E/G Start Permission
      G127-13 (EFIO) - G127-5 (GND) Output B - BR ECM output signal Ignition switch off Below 1 V E/G Start Permission
      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 4)

    5. Using an oscilloscope, check the waveform.


      1. Waveform 1 (Reference)

        B003PMMN02
        Tester Connection G127-4 (ANT1) - G127-5 (GND)
        Tool Setting 2 V/DIV., 2 s./DIV.
        Condition Within 3 seconds of inserting key into ignition key cylinder

      2. Waveform 2 (Reference)

        B003K8AN02
        Tester Connection G127-15 (ANT2) - G127-5 (GND)
        Tool Setting 2 V/DIV., 2 s./DIV.
        Condition Within 3 seconds of inserting key into ignition key cylinder

      3. Waveform 3 (Reference)

        B003OONC02
        *a Approximately 160 ms *b Approximately 270 ms
        Tester Connection G127-12 (EFII) - G127-5 (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)

        B003O88C01
        *a Approximately 160 ms *b Approximately 270 ms
        Tester Connection G127-13 (EFIO) - G127-5 (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

  2. CHECK ECM

    B003Q1QE01

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

      Tester Connection Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item
      C41-1 (E1) - Body ground - W-B - Body ground Ground Always Below 1 Ω -
      C41-3 (ME01) - Body ground - W-B - Body ground Ground Always Below 1 Ω -
      C40-3 (E01) - Body ground - W-B - Body ground Ground Always Below 1 Ω -
      C41-2 (E04) - Body ground - W-B - Body ground Ground Always Below 1 Ω -
      C41-4 (E02) - Body ground - W-B - Body ground Ground Always Below 1 Ω -
      G50-2 (+B) - C41-1 (E1) Input L - W-B +B power supply Ignition switch ON 11 to 14 V -
      G50-3 (+B2) - C41-1 (E1) Input B - W-B +B power supply Ignition switch ON 11 to 14 V -
      G50-1 (BATT) - C41-1 (E1) Input Y - W-B +B power supply Always 11 to 14 V -
      G50-17 (IMO) - C41-1 (E1) Output Y - W-B 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 1)

      		 E/G Start Permission
      G50-16 (IMI) - C41-1 (E1) Input B - W-B Transponder key ECU assembly communication input Ignition switch off Below 1 V E/G Start Permission
      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)

      		 E/G Start Permission

    2. Using an oscilloscope, check the waveform.


      1. Waveform 1 (Reference)

        B003RG2C03
        *a Approximately 160 ms *b Approximately 270 ms
        Tester Connection G50-17 (IMO) - C41-1 (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)

        B003O88C05
        *a Approximately 160 ms *b Approximately 270 ms
        Tester Connection G50-16 (IMI) - C41-1 (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