Entry And Start System Terminals Of Ecu

Engine. Lexus Is250, Is220D. Gse20 Ale20
4Gr-Fse Starting. Lexus Is250, Is220D. Gse20 Ale20

  1. CHECK POWER SOURCE CONTROL ECU

  1. CHECK CERTIFICATION ECU

  1. CHECK ECM

  1. CHECK STEERING LOCK ECU

Entry And Start System -- Terminals Of Ecu



CHECK POWER SOURCE CONTROL ECU

Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Terminals Of Ecu

  1. Disconnect the J55 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 (J55-33) - Body ground
    		O - Body ground
    		+B power supply
    		Always
    		10 to 14 V
    AM2 (J55-12) - Body ground
    		O - Body ground
    		+B power supply
    		Always
    		10 to 14 V
    SSW1 (J55-14) - Body ground
    		B - Body ground
    		Engine switch signal
    		Engine switch pushed
    		Below 1 Ω
    SSW1 (J55-14) - Body ground
    		B - Body ground
    		Engine switch signal
    		Engine switch not pushed
    		10 kΩ or higher
    SSW2 (J55-37) - Body ground
    		SB - Body ground
    		Engine switch signal
    		Engine switch pushed
    		Below 1 Ω
    SSW2 (J55-37) - Body ground
    		SB - Body ground
    		Engine switch signal
    		Engine switch not pushed
    		10 kΩ or higher
    GND2 (J55-6) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    LIN1 (J55-30) - Body ground
    		V - Body ground
    		LIN line
    		Always
    		10 kΩ or higher
    MPX1 (J55-7) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (J55-24) - Body ground
    		GR - Body ground
    		MPX 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 J55 ECU connector.

  4. Measure the voltage of the connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    ACCD (J55-11) - GND2 (J55-6)
    		LG - W-B
    		ACC signal
    		Engine switch on (ACC)
    		Output voltage at terminal AM2 is -2 V or more.
    ACCD (J55-11) - GND2 (J55-6)
    		LG - W-B
    		ACC signal
    		Engine switch off
    		Below 1 V
    IG1D (J55-34) - GND2 (J55-6)
    		P - W-B
    		IG1 signal
    		Engine switch on (IG)
    		Output voltage at terminal AM2 is -2 V or more.
    IG1D (J55-34) - GND2 (J55-6)
    		P - W-B
    		IG1 signal
    		Engine switch on (ACC)
    		Below 1 V
    IG2D (J55-35) - GND2 (J55-6)
    		LG - W-B
    		IG2 signal
    		Engine switch on (IG)
    		Output voltage at terminal AM2 is -2 V or more.
    IG2D (J55-35) - GND2 (J55-6)
    		LG - W-B
    		IG2 signal
    		Engine switch on (ACC)
    		Below 1 V
    STP (J55-1) - GND2 (J55-6)
    		R - W-B
    		Stop light signal
    		Brake pedal depressed
    		Output voltage at terminal AM2 is -2 V or more.
    STP (J55-1) - GND2 (J55-6)
    		R - W-B
    		Stop light signal
    		Brake pedal released
    		Below 1 V
    SLR+ (J55-32) - GND2 (J55-6)
    		W - W-B
    		Steering lock motor signal
    		Steering lock motor operating
    		Below 1 V
    SLR+ (J55-32) - GND2 (J55-6)
    		W - W-B
    		Steering lock motor signal
    		Steering lock motor does not operate
    		Output voltage at terminal AM2 is -2 V or more.
    SLP (J55-26) - GND2 (J55-6)
    		R - W-B
    		Steering lock actuator position signal
    		Steering lock is locked
    		Pulse generation
    (See waveform 3)
    SLP (J55-26) - GND2 (J55-6)
    		R - W-B
    		Steering lock actuator position signal
    		Steering lock is released
    		Pulse generation
    (See waveform 3)
    SPD (J55-19) - GND2 (J55-6)
    		P - W-B
    		Vehicle speed signal
    		Engine switch on (IG), rotate rear wheel slowly
    		Pulse generation
    (See waveform 1)
    TACH (J55-2) - GND2 (J55-6)
    		W - W-B
    		Tachometer signal
    		Engine running
    		Pulse generation
    (See waveform 2)
    P (J55-5) - GND2 (J55-6) *3
    		BR - W-B
    		Shift lock signal
    		Shift lever P position
    		Output voltage at terminal AM2 is -2 V or more.
    P (J55-5) - GND2 (J55-6) *3
    		BR - W-B
    		Shift lock signal
    		Shift lever not P position
    		Below 1 V
    CTSW (J55-31) - GND2 (J55-6)
    		LG - W-B
    		Starter assist signal
    		Brake pedal depressed, shift lever P position, engine switch is pushed once → on (IG)
    		0.1 to 0.8 V *1
    → Output voltage at terminal AM2 is -2 V or more.
    STSW (J55-39) - GND2 (J55-6)
    		L - W-B
    		Starter activation request signal
    		Brake pedal (A/T) or clutch pedal (M/T) depressed, engine switch hold on (ST)
    		Output voltage at terminal AM2 is -2 V or more.
    STR1 (J55-17) - GND2 (J55-6)
    		SB - W-B
    		Park / neutral position switch *3
    Clutch start switch *4
    		Shift lever P or N (A/T) position
    Clutch pedal depressed (M/T)
    		Below 1 V
    STR2 (J55-15) - GND2 (J55-6)
    		V - W-B
    		Starter signal
    		Brake pedal (A/T) or clutch pedal (M/T) depressed, shift lever P or N position (A/T), engine switch on (ST)
    		Output voltage at terminal AM2 is -2 V or more. *2
    INDS (J55-4) - GND2 (J55-6)
    		L - W-B
    		Vehicle condition signal
    		Brake pedal (A/T) or clutch pedal (M/T) depressed, shift lever P position (A/T).
    		Output voltage at terminal AM2 is -2 V or more.
    INDW (J55-13) - GND2 (J55-6)
    		BR - W-B
    		Warning signal
    		Brake pedal (A/T) or clutch pedal (M/T) depressed, shift lever P position (A/T), engine switch on (ACC, IG)
    		Output voltage at terminal AM2 is -2 V or more.
    SWIL (J55-36) - GND2 (J55-6)
    		Y - W-B
    		Illumination signal
    		Light control switch TAIL or HEAD
    		Output voltage at terminal AM2 is -2 V or more.
    SKSW (J55-28) - GND2 (J55-6)
    		B - W-B
    		Key in vehicle signal
    		Engine switch on (ACC, IG)
    		Below 1 V
    HINT:
    *1: Voltage is output only when the engine is cranking.
    *2: Voltage is output for 0.3 seconds when engine is cranking start. Disconnect the E4 connector from the ECM before measuring the voltage.
    *3: A/T
    *4: M/T
    If the result is not as specified, the ECU may have a malfunction.


  5. Using an oscilloscope, check the signal waveform of the ECU.



      Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Terminals Of Ecu

    1. Waveform 1

      Waveform 1 (Reference):
      Terminal No.
      		J55-19 - Body ground
      Tool Setting
      		5 V/DIV., 10 ms./DIV.
      Vehicle Condition
      		Driving at approx. 20 km/h (12 mph)
      HINT:
      As the vehicle speed increases, the wavelength shortens.


      2. Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Terminals Of Ecu

    2. Waveform 2

      Waveform 2 (Reference):
      Terminal No.
      		J55-2 - Body ground
      Tool Setting
      		5 V/DIV., 10 ms./DIV.
      Vehicle Condition
      		Engine idling
      HINT:
      As the engine revolution speed increases, the wavelength shortens.


      3. Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Terminals Of Ecu

    3. Waveform 3

      Waveform 3 (Reference):
      Terminal No.
      		J55-26 - Body ground
      Tool Setting
      		2 V/DIV., 100 ms./DIV.
      Vehicle Condition
      		Steering lock / unlock

CHECK CERTIFICATION ECU

Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Terminals Of Ecu

  1. Disconnect the P33 ECU connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    +B1 (P33-1) - Body ground
    		L - Body ground
    		+B power supply
    		Always
    		10 to 14 V
    IG (P33-18) - Body ground
    		B - Body ground
    		Ignition power supply
    		Engine switch on (IG)
    		10 to 14 V
    IG (P33-18) - Body ground
    		B - Body ground
    		Ignition power supply
    		Engine switch off
    		Below 1 V
    LIN (P33-10) - Body ground
    		V - Body ground
    		LIN line
    		Always
    		10 kΩ or higher
    E (P33-17) - 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

Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Terminals Of Ecu

  1. Disconnect the A5, E5, E4, E3 and E6 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 (A5-6) - Body ground
    		B-R - Body ground
    		Power source of ECM
    		Engine switch on (IG)
    		10 to 14 V
    +B1 (A5-5) - Body ground
    		B-R - Body ground
    		Power source of ECM
    		Engine switch on (IG)
    		10 to 14 V
    IGSW (A5-17) - Body ground
    		B-W - Body ground
    		Ignition switch signal
    		Engine switch on (IG)
    		10 to 14 V
    E01 (E5-2) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E02 (E5-1) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E03 (E3-6) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E04 (E6-5) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E05 (E6-3) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E1 (E4-7) - Body ground
    		BR - Body ground
    		Ground
    		Always
    		Below 1 Ω
    EC (A5-2) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    ME01 (E3-4) - 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 A5, E5, E4, E3 and E6 ECM connectors.

  4. Measure the voltage of the connectors.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    STA (A5-12) - E1 (E4-7)
    		R - BR
    		Starter relay operation signal
    		Cranking
    		10 to 14 V
    ACCR (A5-11) - E1 (E4-7)
    		W-L - BR
    		ACC relay cut signal (output)
    		Engine switch on (IG)
    		10 to 14 V
    TACH (A6-16) - E1 (E4-7)
    		R-W - BR
    		Engine revolution signal (output)
    		Idling
    		Pulse generation (see waveform 1)
    STP (A6-4) - E1 (E4-7)
    		R-B - BR
    		Stop light switch signal (input)
    		Brake pedal depressed
    		7.5 to 14 V
    STP (A6-4) - E1 (E4-7)
    		R-B - BR
    		Stop light switch signal (input)
    		Brake pedal released
    		Below 1.5 V
    STAR (E4-4) - E1 (E4-7)
    		L-Y - BR
    		PNP switch signal (input)
    		Engine switch on (IG), shift position P or N
    		10 to 14 V
    KSW (A5-23) - E1 (E4-7)
    		L-R - BR
    		Engine switch signal (input)
    		Engine switch off
    		4 to 6 V
    KSW (A5-23) - E1 (E4-7)
    		L-R - BR
    		Engine switch signal (input)
    		When engine switch is pushed once
    		10 to 14 V
    KSW (A5-23) - E1 (E4-7)
    		L-R - BR
    		Engine switch signal (input)
    		Engine switch on (ACC)
    		Below 1.5 V
    If the result is not as specified, the ECM may have a malfunction.


    5. Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Terminals Of Ecu

  5. Using an oscilloscope, check the signal waveform of the ECM.

    Waveform 1 (Reference):
    Terminal No.
    		A6-16 - E7-4
    Tool Setting
    		5 V/DIV., 10 ms./DIV.
    Vehicle Condition
    		Engine idling
    HINT:
    As the vehicle speed increases, the wavelength shortens.

CHECK STEERING LOCK ECU

Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Terminals Of Ecu

  1. Disconnect the J29 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 (J29-7) - Body ground
    		O - Body ground
    		+B power supply
    		Always
    		10 to 14 V
    IG2 (J29-6) - Body ground
    		LG - Body ground
    		Ignition power supply
    		Engine switch on (IG)
    		10 to 14 V
    IG2 (J29-6) - Body ground
    		LG - Body ground
    		Ignition power supply
    		Engine switch off
    		Below 1 V
    GND (J29-1) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    SGND (J29-2) - 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 J29 ECU connector.

  4. Measure the voltage of the connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    SLP1 (J29-4) - GND (J29-1)
    		R - W-B
    		Steering lock actuator position signal
    		Steering is locked
    		10 to 14 V
    SLP1 (J29-4) - GND (J29-1)
    		R - 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.