STOP AND START SYSTEM SYSTEM DESCRIPTION


  1. STOP AND START CONTROL

    The stop and start system operates according to the following conditions, achieving appropriate engine stop and start control together with safe and smooth driving characteristics.


    1. When all of the conditions in the following table have been met, the engine is stopped by stop and start control.

      Item

      Condition

      (All of the following conditions are met)
      Idle Stop Push start switch assembly 5 seconds or more have passed with the engine switch on (IG)
      Engine Coolant Temperature 40 to 100°C (104 to 212°F)
      Ambient Temperature -5°C (23°F) or higher
      Driver Door 3 seconds have elapsed after driver door closed
      Driver Seat Belt 3 seconds have elapsed after driver seat belt fastened
      Vehicle Stability Control System Normal
      Brake Booster Vacuum Sufficient (Brake booster vacuum changes in accordance with brake fluid pressure (brake pedal effort))
      Brake Master Cylinder Fluid Pressure*1

      1100 kPa (11.2 kgf/cm2, 160 psi) (changes according to gradient)
      Shift Position After shift lever is operated and 1 second elapses, shift lever is in D, S or M
      Drive Mode ECO or NORMAL mode
      Automatic Transmission Fluid Temperature 25 to 110°C (77 to 230°F)
      Stop and Start System Cancel Switch (Combination switch assembly) Off (System control is not prohibited)
      Vehicle Speed 0 km/h (0 mph) (After the engine warms up)
      Road Grade -8° to +8°
      Engine Speed 1250 rpm or less
      Hood 3 seconds have elapsed after hood closed
      Battery Voltage

        When using specified battery:

      • Higher than 8.08 V when starter begins operation and higher than 8.14 V when cranking


        When using non-specified battery:

      • Higher than 8.92 V when starter begins operation and higher than 8.92 V when cranking
      Battery Temperature*2 Between -10°C and 70°C (14°F and 158°F)
      Battery Integrated Current*3

        None of the following conditions is met:

      • Higher than -17971 A-sec: When "Status of Battery Charge Control"*4 is Charge Control Coordination Mode or Stop and Start Standalone Mode

      • Higher than -8064 A-sec: When value of Data List item Status of Battery Charge Control*4 is "Low Temperature Mode" and battery temperature is between 3°C and 11°C

      • Higher than -5299 A-sec: When value of Data List item Status of Battery Charge Control*4 is "Low Temperature Mode" and battery temperature is between -1°C and 3°C

      • Higher than -0 A-sec: When "Status of Battery Charge Control"*4 is Stop and Start Restriction Mode or Temperature High/Low Mode
      Air Conditioning Other than when stop and start control is prohibited
      Heater

        One of the following conditions is met:

      • Blower switch is off

      • Blower switch is on when the ambient temperature is higher than 10°C (50°F), the engine coolant temperature is higher than 55°C (131°F) or the room temperature is -5°C (23°F) lower than the set temperature (only when stop and start system priority control is set to "Normal" mode)

      • Blower switch on, air conditioning switch off and a certain amount of time has elapsed after engine restarted by stop and start control
      Steering Wheel When the steerage angle of the steering wheel is less than 45 degrees.
      Engine Control Engine catalytic rapid warm-up is completed
      Dynamic Radar Cruise Control System*5

      While full-speed following function is operating, the vehicle is stopped and brake hold control has been entered

      Tech Tips

      When the vehicle has been stopped during full-speed following function, perform brake hold control.

      Tech Tips


      • *1: Enough brake force is applied to prevent the vehicle from moving when the engine is started again.

      • *2: When the battery temperature is below -15°C (5°F), or 75°C (167°F) or higher, stop and start control is prohibited. When the battery temperature returns to -10°C (14°F) or higher, or below 70°C (158°F), stop and start control is permitted.

      • *3: Read the Data List item "Integrated Current" or "Oper Permission (Integrated Current)" when checking the integrated current value

        Click here

      • *4: Please refer to the Data List "Status of Battery Charge Control" for information about the status of the battery charge control.

      • *5: Lexus Safety System +

    2. When the engine is stopped by stop and start control, and any of the following conditions are met, the engine will restart.

      Item

      Condition

      (Any of the following conditions is met)
      Engine Restart Brake Booster Vacuum Brake booster vacuum insufficient (Brake booster vacuum changes in accordance with brake fluid pressure (brake pedal effort))
      Engine Hood Courtesy Switch (Hood Lock Assembly) Engine hood courtesy switch (hood lock assembly) malfunctioning
      SFI System Malfunction in SFI System is detected
      Oil Pump with Motor Assembly Oil pump with motor assembly (automatic transaxle assembly) malfunctioning
      Power Steering System Malfunction in power steering system is detected
      Vehicle Stability Control System Malfunction in vehicle stability control system is detected
      Air Conditioning Timer in the air conditioning amplifier assembly runs out
      Heater Timer in the air conditioning amplifier assembly runs out
      Air Conditioning/Heater

        Both of the following conditions are met:

      • Blower switch: ON

      • Evaporator temperature exceeds threshold value (threshold value varies with temperature, humidity and amount of solar radiation)


        Any of the following conditions are met:

      • A/C switch, blower switch: ON

      • Defogger switch: ON

      • Blower switch turned off during auto control or blower mode changed to manual

      • Changes from stop and start system priority control to normal system control
      Battery Battery performance or voltage drops (11.4 V or less)
      Battery Integrated Current*1 Integrated current value fluctuates -6912 A-sec or less when engine is stopped
      Vehicle Speed Vehicle speed signal is input (Vehicle stopped on a slope, etc.)
      Driver Door Open
      Driver Seat Belt Driver seat belt is unfastened
      Steering Wheel Steering wheel turned 25 degrees or more
      Brake Pedal

      Brake pedal released (brake fluid pressure decreases) or more than 10000 kPa

      Tech Tips

      Do not start the engine while the brake hold is operating.
      Accelerator Pedal Accelerator pedal is depressed
      Stop and Start System Cancel Switch (Combination Switch Assembly) Off (System control is not prohibited) → ON (System control is prohibited)
      Dynamic Radar Cruise Control System*2 While full-speed following function is operating and brake hold is operating, the proceeding vehicle has taken off.

      Tech Tips


      • *1: Read the Data List item "Integrated Current" or "Oper Permission (Integrated Current)" when checking the integrated current value

        Click here

      • *2: Lexus Safety System +

  2. SYSTEM PROHIBITION CONTROL

    The engine stop and start ECU prohibits stop and start control by the stop and start system according to the table below. The prohibition conditions are specified for each system.

    System Prohibition Condition Vehicle State Restoration Condition Prohibition Condition Check Timing
    Engine Engine coolant temperature less than 40°C (104°F) Engine has not warmed up Engine coolant temperature 40 between 105°C (104 to 221°F) Always
    Idle speed learning has not completed Stop and start control prohibited until idle speed learning completes

    Idle speed learning has completed

    Engine Learning: Click here

    AT Learning (U661E)): Click here

    AT Learning (U661F)): Click here

    		Always
    Engine catalytic rapid warm-up Engine catalytic rapid warm-up is being performed Engine catalytic rapid warm-up is completed Each time engine is started or vehicle is stopped
    Brake Brake booster vacuum decreases Brake booster vacuum decreases due to pumping the brakes, etc. Normal brake booster vacuum is reached Every time the vehicle stops
    Brake master cylinder fluid pressure decreases Brake pedal depressed lightly Brake pedal depressed more Every time the vehicle stops
    Hill-start Assist Control Brake control system malfunction DTC detected Brake control system returns normally Always
    When hill-start assist control prohibition is necessary Vehicle speed is 3 km/h (1.8 mph) or more Vehicle is being stopped (vehicle speed is below 3 km/h (1.8 mph)) Always
    Communication between engine stop and start ECU and skid control ECU (brake actuator assembly) is invalid Communication invalid Communication between engine stop and start ECU and skid control ECU (brake actuator assembly) is valid Always
    Gradient of Road Surface Outside the permitted gradient range (vehicle front and rear road surface incline +8° or higher or -8° or lower) Vehicle front and rear road surface incline +8° or higher or -8° or lower Within the permitted gradient range (vehicle front and rear road surface incline within +/-8°) Always
    Air Conditioning

    Heater:


      All of the following conditions are met:

    • Blower switch on

    • Ambient temperature 10°C (50°F) or less

    • Either of the following conditions is met:


      • Engine coolant temperature 55°C (131°F) or less

      • Cabin temperature lower than set temperature by -5°C (23°F) or less

    		 Heater performance decreases

    • Actual temperature higher than target temperature

    • Blower switch off

    		 While the heater is on

    Cooling function:


      When blower switch and A/C switch is on and ambient temperature 23°C (73.4°F) or higher, any of the following conditions are met (only when the engine switch is first turned on (IG)):

    1. Evaporator temperature 9°C (48.2°F) or higher

    2. Cabin temperature higher than set temperature by 3°C (37.4°F) or higher, or blower level 16 or higher (only when stop and start system priority control is set to "Normal" mode)

    		 Cooling performance decreases

      Any of the following conditions have been met:

    1. Actual temperature higher than target temperature

    2. Blower switch is off

    3. Air conditioning switch is off

    		 While the air conditioning system (cooling function) is on

    Defogger:


      Any of the following conditions are met:

    1. Defogger switch

    2. Blower switch on

    		 Fogging of windows Defogger switch or blower switch off While the air conditioning system (cooling function for defogger) is on

    Temporary stop and start control:


      Both of the following conditions are met:

    • Blower switch on

    • Evaporator temperature exceeds threshold (threshold varies with temperature, humidity and amount of solar radiation)

    		 Blower switch on Blower switch off and evaporator temperature within specified range Always
    Driver Door Driver door opened before engine stop by engine stop and start control Driver door courtesy switch ON signal input 3 seconds have elapsed since driver door was closed Always
    Engine Hood Engine hood opened before engine stop by stop and start control Engine hood switch OFF signal input 3 seconds have passed since engine hood was closed Always
    Seat Belt Driver seat belt not fastened before engine stop by engine stop and start control Driver seat belt buckle switch OFF signal input 3 seconds have passed since driver seat belt was fastened Always
    Steering Wheel Steering wheel turned at a speed of 45 deg/s or more Steering wheel operation signal input Steering wheel being held Always
    Automatic Transmission Assembly Automatic transmission fluid temperature: Below 25°C (77°F) or 110°C (230°F) or higher Automatic transmission fluid temperature signal input Permission oil temperature range reached Always
    Shift Position Shift lever in P, N or R Shift position signal input Brake pedal depressed and shift lever in D Always
    Drive Mode Drive mode other than ECO or NORMAL mode Drive mode signal input Drive mode ECO or NORMAL mode Always
    Ambient Temperature Ambient temperature lower than -5°C (23°F) - Ambient temperature -5°C (23°F) or higher Always
    Power Source

      When using specified battery:

    • Higher than 8.08 V when starter begins operation and higher than 8.14 V when cranking


      When not using specified battery:

    • Higher than 8.92 V when starter begins operation and higher than 8.92 V when cranking

    		 Battery charge insufficient or battery has deteriorated Battery charged or replaced Every time the engine started
    Battery temperature below -15°C (5°F) or 75°C (167°F) or higher Depends on ambient temperature An appropriate battery temperature is reached (between -10 and 70°C (14 to 158°F)) Always

      When "Battery Integrated Current"*1 is as specified in any of the following situations:

    • -19123 A-sec or less: When "Status of Battery Charge Control"*2 is Charge Control Coordination Mode or Stop and Start Standalone Mode

    • -9216 A-sec or less: When "Status of Battery Charge Control"*4 is Low Temperature Mode and the temperature of the battery is between 3°C and 11°C

    • -6451 A-sec or less: When "Status of Battery Charge Control"*4 is Low Temperature Mode and the temperature of the battery is between -1°C and 3°C

    • -1152 A-sec or less: When "Status of Battery Charge Control"*4 is Stop and Start Restriction Mode or Temperature High/Low Mode

    • Heavy electrical load

    • High stop and start rate (Time that engine stopped by stop and start control is long)

      When "Battery Integrated Current"*1 is as specified in any of the following situations:

    • Higher than -17971 A-sec: When "Status of Battery Charge Control"*2 is Charge Control Coordination Mode or Stop and Start Standalone Mode

    • Higher than -8064 A-sec: When "Status of Battery Charge Control"*2 is Low Temperature Mode and the temperature of the battery is between 3°C and 11°C

    • Higher than -5299 A-sec: When "Status of Battery Charge Control"*2 is Low Temperature Mode and the temperature of the battery is between -1°C and 3°C

    • Higher than -0 A-sec: When "Status of Battery Charge Control"*2 is Stop and Start Restriction Mode or Temperature High/Low Mode

    		 Always
    During refresh charge

    • Cable reconnected to negative (-) battery terminal

    • Refresh charge is performed for 30 minutes or longer for every 30 hours of driving

    		 30 minutes to 1 hour has elapsed Always
    Engine started with the engine hood open (for jump starting) - After engine switch is turned off, engine switch is turned on (IG) with hood closed Every time the engine started
    Idling Stop Rate Idling stop rate for one trip is 50% and total idling stop rate is 40% Vehicle is stopped for long time Idling stop rate has decreased due to vehicle being driven and engine idling Always

    Tech Tips


    • *1: Read the Data List item "Integrated Current" and "Oper Permission (Integrated Current)" when checking the integrated current value

    • *2: Please refer to the Data List "Status of Battery Charge Control" for information about the status of the battery charge control.

    • If the cable is disconnected from the negative (-) battery terminal, stop and start control is prohibited until refresh charge is completed. In this case, drive the vehicle approximately 5 to 60 minutes until refresh charge is completed and stop and start control operation is permitted.

    • Allow the engine to idle for 3 minutes after it is warmed up and check that the engine idle speed is within 50 rpm of the target idle speed.

  3. WARNING CONTROL

    If any of the following operations are performed while the engine is stopped due to stop and start control, the system will not restart the engine. The engine will change the mode from "stopped due to system control" to "stalled" or the driver will be warned using the buzzer.

    Operation Warning Control
    The engine hood is opened with the shift lever in D, S or M The engine stops (mode changes to "stalled", and the engine cannot be restarted until the engine switch is turned off and then on (IG))
    The driver door is opened with the shift lever in D, S or M The engine starts, warning buzzer sounds and stop and start indicator light blinks
    The driver seat belt is unfastened The engine starts

  4. WARNING INDICATOR AND BUZZER OPERATION

    A01VTO7C01
    *a Stop and Start Indicator Light
    *b Stop and Start Cancel Indicator Light

    The driver is informed of the system control status and warnings by the stop and start indicator light, stop and start cancel indicator light and the buzzer.

    Stop and Start Indicator and Buzzer Operation
    Item Condition Stop and start indicator light Stop and start cancel indicator light Buzzer
    For 3 seconds after the engine switch on (IG) Normal operation Comes on Comes on Does not sound
    During stop and start control operation (engine is stopped) Normal operation Comes on Does not come on Does not sound
    Driver door opened The blinking interval 0.15 seconds* Does not come on Sounds*
    After engine started by stop and start control Driver door opened within 5 seconds of engine start The blinking interval 0.15 seconds* Does not come on Sounds*
    Control is prohibited by the stop and start system cancel switch (combination switch assembly) Normal operation Does not come on Comes on Does not sound
    Diagnostic trouble code Any DTCs are stored Does not come on Blinks at 0.5 second intervals. Does not sound
    Starter assembly life Number of times the starter has been operated exceeds its limit Does not come on Blinks at 0.5 second intervals. Does not sound

    • *: Shift lever in D, S or M

  5. MULTI-INFORMATION DISPLAY MESSAGE AND INDICATOR OPERATION

    An indicator and/or messages are displayed on the multi-information display to indicate condition of the stop and start system when certain vehicle conditions are met.

    Stop and Start System Condition Multi-information Display Message* Vehicle Condition
    When the engine cannot be stopped by the stop and start system A01VWFP "Non-Dedicated Battery" A non-specified battery for the stop and start system may have been installed.
    "Battery Charging"

    • The battery charge amount may be low.

    • A refresh charge may be occurring.
    "Stop & Start Unavailable" The engine may have been started withthe hood opened.
    "System Temperature Low" The battery may be cold.
    "System Temperature High" The battery may be extremely hot.
    "For Brake System"

    • The brake booster load decreased.

    • The vehicle is operated at a high elevation.
    "For Climate Control"

    • The air conditioning system is being used when the ambient temperature is high or low.

    • Windshield defogger is pressed.
    "Driver Seat Belt Unbuckled" The driver seat belt is not fastened.
    "Steering Wheel Turned" The steering wheel is being turned.
    "Depress Brake Firmly to Activate" The brake pedal is not depressed enough.
    When the engine automatically restarts while stopped by the atop and start system A01VWFP "Driver Seat Belt Unbuckled" The driver seat belt is not fastened.
    "Steering Wheel Turned" The steering wheel is turned.
    "For Brake System" The brake pedal is strongly depressed furtheror pumped.
    "For Climate Control"

    • The air conditioning system is turned on or the air conditioning is being used.

    • Windshield defogger is turned on.
    "Battery Charging" The battery charge amount may be low.
    The system may be malfunctioning -

    "Stop & Start System Malfunction"

    "Visit Your Dealer"

    		 -

    Tech Tips

    *: Messages are listed in the order of priority.

  6. STOP AND START SYSTEM OPERATION

    Depending on the type of malfunction, stop and start control may be prohibited by the fail-safe function. The following table shows effects on the vehicle and areas to be inspected when there is a malfunction in the stop and start system.

    Malfunctioning Area Malfunction DTC Output Data List / Freeze Frame Data Effect on Vehicle Area to be Inspected
    IGSW circuit Open P2531

    • IG Switch

    • IG SW Abnoml

    		 Stop and start control prohibited Wire harness or connector
    +B circuit Open - Data List cannot be checked because power not supplied to the engine stop and start ECU Stop and start control prohibited Wire harness or connector
    CLL (park/neutral position switch assembly) circuit Stuck on P1780

    • Neutral Switch

    • Neutral Switch Stuck ON

    • Neutral SW Abnoml (ON)

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • Wire harness or connector

    • Park/neutral position switch assembly
    Stuck off P1780

    • Neutral Switch

    • Neutral Switch Stuck OFF

    • Neutral SW Abnoml (OFF)

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks
    BNT1 (engine hood courtesy switch) circuit Stuck on - Hood Courtesy Switch Mode does not change to "stalled" when engine hood opened with shift lever in D, S or M and engine stopped by stop and start control

    • Wire harness or connector

    • Engine hood courtesy switch (Hood lock assembly)
    Stuck off - Hood Courtesy Switch Stop and start control prohibited despite engine hood being closed
    BRVC/PB/BRE2 (vacuum sensor) circuit Open P1540

    • Brk Boost Sen Abnoml 1

    • Brk Boost Sen Abnoml 2

    • Brk Boost Sen Abnoml 3

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • Wire harness or connector

    • Vacuum sensor assembly

    • Brake booster assembly

    • Vacuum hose
    Shorted P1540
    Remains at intermediate value P1541
    ECAN (eco run cancel switch assembly) circuit Stuck on - Cancel Switch Stop and start control prohibited

    • Wire harness or connector

    • Stop and start system cancel switch (combination switch assembly)
    Stuck off - Cancel Switch Stop and start control cannot be canceled by pressing the stop and start system cancel switch (combination switch assembly)

    NOPM circuit

    OPM1 circuit

    OP21 circuit

    (Automatic transaxle oil pump with motor assembly)

    • Open

    • Shorted

    • Internal circuit malfunction

    • Battery

    P1538

    P1539

    • Oil Pump Relay

    • Oil Pump Status

    • Oil Pump Duty

    • State of Oil Pump Motor Rotation

    • Oil Pump Motor Rotation Frequency

    • Oil Pump Abnormality Judgment

    • Status of O/P Signal 1

    • Status of O/P Signal 2

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • Wire harness or connector

    • Transmission wire

    • Engine stop and start ECU

    • Oil pump with motor assembly (automatic transaxle assembly)
    Automatic transaxle oil pump with motor assembly Oil pump with motor assembly malfunction P0942 Oper Permission(AT/CVT) Stop and start control prohibited Oil pump with motor assembly (automatic transaxle assembly)
    STA circuit Overcurrent P0617

    • Starter Relay Overcurrent

    • Starter Circuit Abnoml

    • Starter Circuit Open

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • BBC NO. 1 fuse

    • BBC NO. 2 fuse

    • Wire harness or connector

    • ST relay

    • ST NO. 2 relay

    • Engine stop and start ECU
    Stuck on P1644

    • Wire harness or connector

    • ST relay

    • ST NO. 2 relay

    • Engine stop and start ECU
    Stuck off P1644
    BBC (backup boost converter) circuit Overcurrent B22C0

    • State of BBC

    • BBC Abnoml

    • BBC Overcurrent

    • BBC Check Result

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • BBC NO. 1 fuse

    • BBC NO. 2 fuse

    • Wire harness or connector

    • Engine stop and start ECU

    • Battery

    • ECUs and sensors connected to B41, B42, B43 and IG41

    • Open

    • Shorted

    • Internal circuit malfunction

    • Battery

    		 P323B

    • State of BBC

    • BBC Duty

    • BBC Thermistor

    • BBC Abnoml

    • BBC Over Heat

    • BBC Power Low

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • BBC NO. 1 fuse

    • BBC NO. 2 fuse

    • Wire harness or connector

    • Engine stop and start ECU

    • Battery
    Eco-run vehicle converter assembly (external backup boost converter) circuit

    • Open

    • Shorted

    • Internal circuit malfunction

    • Battery

    		 P33B3

    • State of External BBC

    • External BBC Overcurrent History

    • External BBC Abnormal

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • BBC NO. 3 fuse

    • Wire harness or connector

    • Eco-run vehicle converter assembly (external backup boost converter)

    • Battery
    ECU inner circuit Malfunction P0607 -

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    		 Engine stop and start ECU
    Monitoring CPU circuit Malfunction P060A State of BBC

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    		 Engine stop and start ECU
    EEPROM Malfunction P062F EEPROM

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    		 Engine stop and start ECU
    Starter delay circuit Malfunction P161D

    • Pinion Gear

    • Starter Motor

    • Starter Delay Circuit

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    		 Engine stop and start ECU
    Effects on Vehicle due to Related System Malfunctions
    Malfunctioning Area Malfunction DTC Output Data List / Freeze Frame Data Effect on Vehicle Area to be Inspected
    SFI system MIL illuminated DTCs for SFI system output

    • Oper Permission (ECM 1)

    • Oper Permission (ECM 2)

    		 Stop and start control prohibited SFI system
    Abnormal NE signal DTCs for SFI system output Crank Pos Sen Abnoml 3

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • SFI system (crank position sensor circuit)

    • Wire harness or connector
    Crankshaft reverse rotation detection DTCs for SFI system output -

    • Stop and start control prohibited

    • MIL illuminated

    		 SFI system (crank position sensor circuit)
    Vehicle stability control system VSC Running - ABS Running Stop and start control prohibited -
    Malfunction in wheel speed sensor Brake control system DTCs output

    • Vehicle Spd1 (ABS/VSC)

    • Wheel Speed Malfunction

    		 Stop and start control prohibited

    • Wire harness or connector

    • Skid control ECU (Brake actuator assembly)

    • Vehicle speed sensor
    Seat belt warning system Malfunction in seat belt warning system - Oper Permission (Driver Side Buckle SW)

    • Stop and start control prohibited (stuck off)

    • Engine does not restart when it is stopped by stop and start control (stuck on)

    • Front seat inner belt assembly (for driver side)

    • Wire harness or connector
    Driver door courtesy light switch circuit Malfunction in driver door courtesy light switch circuit - D Courtesy Switch Signal

    • Stop and start control prohibited (stuck off)

    • Engine does not restart when it is stopped by stop and start control (stuck on)

    • Stop and start cancel indicator light blinks

    • Buzzer sounds

    • Front door courtesy light switch assembly (for driver side)

    • Driver door courtesy light switch circuit
    Air conditioning system Malfunction in ambient temperature sensor Air conditioning system DTCs output Ambient Temp Sensor Stop and start control prohibited Ambient temperature sensor circuit
    Brake vacuum Brake booster vacuum drops -

    • Brake Boost Pressure

    • Brake Negative Pressure

    • Brk Boost Sen Abnoml 1

    • Brk Boost Sen Abnoml 2

    • Brk Boost Sen Abnoml 3

    		 Stop and start control prohibited

    • Brake booster assembly vacuum

    • Brake booster assembly

    • Vacuum sensor assembly

    • Vacuum hose
    Power source Backup boost converter malfunction P323B

    • State of BBC

    • BBC Duty

    • BBC Thermistor

    • BBC Abnoml

    • BBC Over Heat

    • BBC Power Low

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • BBC NO. 1 fuse

    • BBC NO. 2 fuse

    • Wire harness or connector

    • Engine stop and start ECU

    • Battery
    Charging system malfunction - Alternator Status Stop and start control prohibited Charging system
    Low voltage P0562 Battery Abnoml

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • Wire harness or connector

    • Battery

    • Relay
    Charging control abnormal P160F Charging control abnormal

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    		 Charging system
    Number of starter operations Exceeds the specified limit P1545 Starter Count Abnoml

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • Starter assembly replacement is required.

    • ST relay replacement is required.

    • ST NO. 2 relay replacement is required.

    • Fuse replacement is required.
    Starter signal malfunction Signal does not match with the starter switch P1545 -

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • Wire harness or connector

    • Engine stop and start ECU
    Jump start Engine started with the engine hood open - Eng Start Req (Engine Hood Open)

    Stop and start control prohibited

    (permitted when the engine switch is turned off)

    • Check for history of roadside service or jump start due to dead battery

    • Engine hood courtesy switch (Hood lock assembly)
    CAN communication Communication interrupted

    U0100

    U0121

    U0123

    U0126

    U0131

    U0140

    U0151

    U0164

    		 -

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • Applicable wire harness or connector

    • Applicable ECU