ENTRY AND START SYSTEM > TERMINALS OF ECU

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CHECK POWER SOURCE CONTROL ECU

B075721E08

  1. Disconnect the L73 ECU connector.

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    AM1 (L73-33) - Body ground
    		O - Body ground
    		+B power supply
    		Always
    		10 to 14 V
    AM2 (L73-12) - Body ground
    		BR - Body ground
    		+B power supply
    		Always
    		10 to 14 V
    SSW1 (L73-14) - Body ground
    		P - Body ground
    		Engine switch signal
    		Engine switch pushed
    		Below 1 Ω
    SSW1 (L73-14) - Body ground
    		P - Body ground
    		Engine switch signal
    		Engine switch not pushed
    		10 kΩ or higher
    SSW2 (L73-37) - Body ground
    		B - Body ground
    		Engine switch signal
    		Engine switch pushed
    		Below 1 Ω
    SSW2 (L73-37) - Body ground
    		B - Body ground
    		Engine switch signal
    		Engine switch not pushed
    		10 kΩ or higher
    GND2 (L73-6) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    LIN1 (L73-30) - Body ground
    		W - Body ground
    		LIN line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Reconnect the L73 ECU connector.

  4. Measure the voltage of the connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    ACCD (L73-11) - GND2 (L73-6)
    		G - W-B
    		ACC signal
    		Engine switch on (ACC)
    		10 to 14 V
    ACCD (L73-11) - GND2 (L73-6)
    		G - W-B
    		ACC signal
    		Engine switch off
    		Below 1 V
    IG1D (L73-34) - GND2 (L73-6)
    		SB - W-B
    		IG1 signal
    		Engine switch on (IG)
    		10 to 14 V
    IG1D (L73-34) - GND2 (L73-6)
    		SB - W-B
    		IG1 signal
    		Engine switch on (ACC)
    		Below 1 V
    IG2D (L73-35) - GND2 (L73-6)
    		Y - W-B
    		IG2 signal
    		Engine switch on (IG)
    		10 to 14 V
    IG2D (L73-35) - GND2 (L73-6)
    		Y - W-B
    		IG2 signal
    		Engine switch on (ACC)
    		Below 1 V
    STP (L73-1) - GND2 (L73-6)
    		V - W-B
    		Stop light signal
    		Brake pedal depressed
    		10 to 14 V
    STP (L73-1) - GND2 (L73-6)
    		V - W-B
    		Stop light signal
    		Brake pedal released
    		Below 1 V
    SLR+ (L73-32) - GND2 (L73-6)
    		LG - W-B
    		Steering lock motor signal
    		Steering lock motor operating
    		Below 1 V
    SLR+ (L73-32) - GND2 (L73-6)
    		LG - W-B
    		Steering lock motor signal
    		Steering lock motor does not operate
    		10 to 14 V
    SLP (L73-26) - GND2 (L73-6)
    		V - W-B
    		Steering lock actuator position signal
    		Steering lock is locked
    		10 to 14 V
    SLP (L73-26) - GND2 (L73-6)
    		V - W-B
    		Steering lock actuator position signal
    		Steering lock is released
    		Below 1 V
    SPD (L73-19) - GND2 (L73-6)
    		L - W-B
    		Vehicle speed signal
    		Engine switch on (IG), rotate rear wheel slowly
    		Pulse generation (see waveform 1)
    TACH (L73-2) - GND2 (L73-6)
    		W - W-B
    		Tachometer signal
    		Engine running
    		Pulse generation (see waveform 2)
    P (L73-5) - GND2 (L73-6)
    		LG - W-B
    		Shift lock signal
    		Shift lever P position
    		10 to 14 V
    P (L73-5) - GND2 (L73-6)
    		LG - W-B
    		Shift lock signal
    		Shift lever not P position
    		Below 1 V
    CTSW (L73-31) - GND2 (L73-6)
    		R - W-B
    		Starter assist signal
    		Brake pedal depressed, shift lever P position, engine switch is pushed once
    		Below 1 V*1
    STSW (L73-39) - GND2 (L73-6)
    		V - W-B
    		Starter activation request signal
    		Brake pedal depressed, shift lever P position, engine switch is pushed once
    		10 to 14 V*2
    STR1 (L73-17) - GND2 (L73-6)
    		SB - W-B
    		Park/neutral position switch
    		Shift lever P position
    		Below 1 V
    STR2 (L73-15) - GND2 (L73-6)
    		L - W-B
    		Starter signal
    		Brake pedal depressed, shift lever P position, engine switch is pushed once
    		10 to 14 V*2
    INDS (L73-4) - GND2 (L73-6)
    		SB - W-B
    		Vehicle condition signal
    		Brake pedal depressed, shift lever P position, engine switch on (ACC, IG)
    		10 to 14 V
    INDW (L73-13) - GND2 (L73-6)
    		R - W-B
    		Warning signal
    		Brake pedal released, shift lever P position, engine switch on (ACC, IG)
    		10 to 14 V
    SWIL (L73-36) - GND2 (L73-6)
    		GR - W-B
    		Illumination signal
    		Light control switch TAIL or HEAD
    		10 to 14 V

    HINT:
    *1: Voltage is output only when the engine is cranking.
    *2: Voltage is output for 0.3 seconds after the engine start.

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



  5. Inspect using an oscilloscope.



      I042329E01

    1. Waveform 1 (Reference)
      Item
      		Content
      Symbols (Terminal No.)
      		SPD (L73-19) - Body ground
      Tool Setting
      		5 V/DIV., 10 msec./DIV.
      Condition
      		Driving at approx. 20 km/h (12 mph)

      HINT:
      As the vehicle speed increases, the wavelength shortens.



      2. I042330E01

    2. Waveform 2 (Reference)
      Item
      		Content
      Symbols (Terminal No.)
      		TACH (L73-2) - Body ground
      Tool Setting
      		5 V/DIV., 10 msec./DIV.
      Condition
      		Engine idling

      HINT:
      As the vehicle speed increases, the wavelength shortens.


CHECK CERTIFICATION ECU

B106648E10

  1. Disconnect the V28 and V33 ECU connectors.

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    +B1 (V28-1) - Body ground
    		R - Body ground
    		+B power supply
    		Always
    		10 to 14 V
    IG (V28-18) - Body ground
    		B - Body ground
    		Ignition power supply
    		Engine switch on (IG)
    		10 to 14 V
    IG (V28-18) - Body ground
    		B - Body ground
    		Ignition power supply
    		Engine switch off
    		Below 1 V
    LIN (V28-10) - Body ground
    		LG - Body ground
    		LIN line
    		Always
    		10 kΩ or higher
    E (V28-17) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK ECM

A103802E05

  1. Disconnect the A6, E6, E7, E8 and E45 ECM connectors.

  2. Measure the voltage and resistance of the wire harness side connectors.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    +B (A6-6) - Body ground
    		B-R - Body ground
    		Power source of ECM
    		Engine switch on (IG)
    		10 to 14 V
    +B1 (A6-5) - Body ground
    		B-R - Body ground
    		Power source of ECM
    		Engine switch on (IG)
    		10 to 14 V
    IGSW (A6-17) - Body ground
    		B-W - Body ground
    		Ignition switch signal
    		Engine switch on (IG)
    		10 to 14 V
    E01 (E6-2) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E02 (E6-1) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E03 (E8-6) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E04 (E45-5) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E05 (E45-3) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E1 (E7-7) - Body ground
    		BR - Body ground
    		Ground
    		Always
    		Below 1 Ω
    EC (A6-2) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    ME01 (E8-4) - Body ground
    		W-B - 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 A6, E6, E7, E8 and E45 ECM connectors.

  4. Measure the voltage of the connectors.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    STA (A6-12) - E1 (E7-7)
    		R - BR
    		Starter relay operation signal
    		Cranking
    		10 to 14 V
    ACCR (A6-11) - E1 (E7-7)
    		W-L - BR
    		ACC relay cut signal (output)
    		Engine switch on (IG)
    		10 to 14 V
    TACH (A7-16) - E1 (E7-7)
    		W-L - BR
    		Engine revolution signal (output)
    		Idling
    		Pulse generation (see waveform 1)
    STP (A7-4) - E1 (E7-7)
    		R-B - BR
    		Stop light switch signal (input)
    		Brake pedal depressed
    		7.5 to 14 V
    STP (A7-4) - E1 (E7-7)
    		R-B - BR
    		Stop light switch signal (input)
    		Brake pedal released
    		Below 1.5 V
    STAR (E7-4) - E1 (E7-7)
    		L-Y - BR
    		PNP switch signal (input)
    		Engine switch on (IG), shift position P or N
    		10 to 14 V
    If the result is not as specified, the ECM may have a malfunction.



  5. Inspect using an oscilloscope.



      I042330E01

    1. Waveform 1 (Reference)
      Item
      		Content
      Symbols (Terminal No.)
      		TACH (A7-16) - Body ground
      Tool Setting
      		5 V/DIV., 10 msec./DIV.
      Condition
      		Engine idling

      HINT:
      As the vehicle speed increases, the wavelength shortens.


CHECK STEERING LOCK ECU

B106649E05

  1. Disconnect the L28 ECU connector.

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    B (L28-7) - Body ground
    		L - Body ground
    		+B power supply
    		Always
    		Always
    IG2 (L28-6) - Body ground
    		B - Body ground
    		Ignition power supply
    		Engine switch on (IG)
    		Always
    IG2 (L28-6) - Body ground
    		B - Body ground
    		Ignition power supply
    		Engine switch off
    		Below 1 V
    GND (L28-1) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    SGND (L28-2) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω

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

  3. Reconnect the L28 ECU connector.

  4. Measure the voltage of the connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    SLP1 (L28-4) - GND (L28-1)
    		V - W-B
    		Steering lock actuator position signal
    		Steering is locked
    		10 to 14 V
    SLP1 (L28-4) - GND (L28-1)
    		V - W-B
    		Steering lock actuator position signal
    		Steering is released
    		Below 1 V

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