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 system control.

      Item

      Condition

      (All of the following conditions are met)
      Idle Stop Ignition Switch 5 seconds or more have passed with the ignition switch ON
      Engine Coolant Temperature

      Within the specified temperature range (varies depending on the vehicle usage environment)

      Tech Tips


      • The upper limit is 105°C (221°F)

      • The lower limit is maximum 40°C (104°F)
      Atmospheric Pressure

      70 kPa (0.7 kgf/cm2, 10 psi) or higher
      Ambient Temperature -5°C (23°F) or higher
      Driver Door Closed
      Driver Seat Belt Fastened
      Brake Booster Vacuum Sufficient (42.5 kPa (319 mmHg, 12.6 in.Hg) or higher at horizontal road)
      Shift Position Shift lever in neutral
      Stop and Start System Cancel Switch Off (system control is not prohibited)
      Vehicle Speed 0 km/h (0 mph) (After the engine warms up)
      Engine Speed Less than 1250 rpm
      Engine Hood Closed
      Battery Voltage 7.37 V or higher at engine start
      Battery Temperature*1 -10 to 70°C (14 to 158°F)
      Battery Integrated Current*2

      1. 0 A-sec or higher: After engine start by ignition switch operation

      2. The integrated current value has increased to 0 A-sec or higher at least once after the ignition switch is turned to ON:

        Tech Tips

        The engine is stopped until the following conditions are not met:


        • -6451 A-sec or higher: When "Status of Battery Charge Control"*3 is Charge Control Coordination Mode or Low Temperature Mode

        • -1152 A-sec or higher: When "Status of Battery Charge Control"*3 is Stop and Start Standalone Mode, Stop and Start Restriction Mode or Temperature High/Low Mode
      Air Conditioning Other than when stop and start control is prohibited
      Heater

        Once 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 higher than the set temperature minus 5°C (23°F) (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 Steering wheel turning torque below 2.7 Nm (27 kgf/cm, 23 in.lbf)

      Tech Tips


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

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

      • *3: Read the Data List item "Status of Battery Charge Control" when checking the battery charge control Click here.

    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 are met)
      Engine Restart Brake Booster Vacuum The brake booster vacuum is insufficient (37.5 kPa (281 mmHg, 11.0 in.Hg) or lower at horizontal road)
      ECD System Malfunction in ECD system is detected
      Power Steering System Malfunction in power steering system is detected
      Vehicle Stability Control System Malfunction in vehicle stability control system is detected
      Air Conditioning The timer in the air conditioning amplifier assembly runs out
      Heater The 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 (w/ Automatic Air Conditioning System)

      • Stop and start system priority control changed from "Extended" to "Normal"
      Battery Battery performance or voltage drops
      Vehicle Speed Vehicle speed signal is input
      Driver Door Open
      Driver Seat Belt Driver seat belt is unfastened
      Stop and Start System Cancel Switch Stop and start system cancel switch (ecorun cancel switch assembly) is turned from off to on
      Clutch Pedal When the clutch pedal is depressed
      Steering Wheel Steering wheel turning torque 6 Nm (61 kgf/cm, 53 in.lbf) or more
      Parking Brake Release operation is performed while the parking brake is locked
      Heater Switch Assembly* The heater switch assembly is turned on

      *: w/ Combustion Type Power Heater 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.

    Item Prohibition Condition Vehicle State Restoration Condition Prohibition Condition Check Timing
    Engine

    Not within the specified temperature range (varies depending on the vehicle usage environment)

    Tech Tips


    • The upper limit is 105°C (221°F)

    • The lower limit is maximum 40°C (104°F)

    		 Engine has not warmed up Within the specified temperature range (varies depending on the vehicle usage environment) Always

    Atmospheric pressure 70 kPa (0.7 kgf/cm2, 10 psi) or less

    		 -

    Atmospheric pressure 70 kPa (0.7 kgf/cm2, 10 psi) or higher

    		 Always
    Brake Brake booster vacuum decreases (37.5 kPa (281 mmHg, 11.0 in.Hg) or lower at horizontal road) Brake booster vacuum decreases due to pumping the brakes, etc. Normal brake booster vacuum is reached Every time the vehicle stops
    Air Conditioning

    Heater:


      When blower switch is on and ambient temperature 10°C (50°F) or less, any of the following conditions are met:

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

    • Cabin temperature equal to or lower than set temperature minus 5°C (23°F) (only when stop and start system priority control is set to "Normal" mode)

    		 Heater performance decreases

    • Actual temperature higher than target temperature

    • Blower switch is off

    		 While the heater is on
    Heater switch is on (for Combustion Type Power Heater System) - Heater switch is off (for Combustion Type Power Heater System) 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:

    • Evaporator temperature 9°C (48.2°F) or higher

    • Cabin temperature higher than set temperature by 3°C (37.4°F) or more, 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

    • Actual temperature higher than target temperature

    • Blower switch is off

    • Air conditioning switch is off

    		 While the air conditioning system (cooling function) is on

    Defogger:


    • Defogger switch and blower switch on

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

    Temporary start 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 is opened before engine stop by engine stop and start control Driver door courtesy switch ON signal is input Driver door is closed Always
    Engine Hood Engine hood is opened before engine stop by stop and start control Engine hood courtesy switch (hood lock assembly) OFF signal is input Engine hood is closed Always
    Seat Belt Driver seat belt is not fastened before engine stop by engine stop and start control Driver seat belt buckle switch OFF signal is input Driver seat belt is fastened Always
    Ambient Temperature Ambient temperature below -5°C (23°F) - Ambient temperature -5°C (23°F) or higher Always
    Power Source Battery voltage drops below 7.37 V at engine start Battery charge is insufficient or battery has deteriorated Battery is charged or replaced Every time the engine is started
    Battery temperature is -15°C (5°F) or less or 75°C (167°F) or higher (At low temperatures: Engine restarting is not assured at high temperatures: For battery protection) Depends on ambient temperature An appropriate battery temperature is reached Always

    Battery integrated current*1 value is:


    1. Less than 0 A-sec: After engine start by ignition switch operation

    2. One of the following integrated current conditions is met:


      • -6451 A-sec or less: When "Status of Battery Charge Control"*2 is Charge Control Coordination Mode or Low Temperature Mode

      • -1152 A-sec or less: When "Status of Battery Charge Control"*2 is Stop and Start Standalone Mode, 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)

    Battery integrated current*1 value is more than a certain level.


    1. 0 A-sec or higher: After engine start by ignition switch operation

    2. One of the following integrated current conditions is met:


      • -5299 A-sec or higher: When "Status of Battery Charge Control"*2 is Charge Control Coordination Mode or Low Temperature Mode

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

    		 Always
    During refresh charge

    • Cable reconnected to negative (-) battery terminal

    • A refresh charge of 30 minutes or more is performed after every 20 hours of driving

    		 30 minutes to 1 hour has elapsed Always
    Idling stop rate 40% or higher - Idling stop rate 24% or less Always
    Engine is started with the engine hood open (for jump starting) - Ignition switch is turned off Every time the engine is started
    Clutch Pedal clutch pedal is depressed - Clutch pedal is released Every time the vehicle is stopped
    Shift Range Shift lever not in neutral - Shift lever in neutral Every time the vehicle is stopped
    Steering Wheel Steering wheel turned with 2.7 Nm (27 kgf/cm, 23 in.lbf) of force or more - Steering wheel turning torque below 2.7 Nm (27 kgf/cm, 23 in.lbf) Always
    Parking Brake Parking brake transitioning Parking brake transitioning Parking brake operation complete Always
    Gradient of Road Surface Outside the permission 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 permission gradient range (vehicle front and rear road surface incline within +/-8°) Every time the vehicle is stopped

    Tech Tips


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

    • *2: Read the Data List item "Status of Battery Charge Control" when checking the battery charge control Click here.

    • When the cable is disconnected from the negative (-) battery terminal, stop and start control is prohibited until refresh charge is completed. After connecting the cable, drive the vehicle until refresh charge is completed and stop and start control is permitted (approximately 5 to 40 minutes).

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

    • Even if the automatic engine restart conditions are met while the parking brake is in operation, the engine does not immediately restart. The engine restarts when the parking brake is engaged.

    • If the parking brake switch is pressed while the engine is restarting, the engine restart may be canceled. If the operation was canceled, the engine restarts when the parking brake is engaged.

  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 driver door is opened while the shift lever is in neutral The engine starts
    The driver seat belt is unfastened while the shift lever is in neutral The engine starts
    The engine hood opened The engine changes to "stalled" (once the ignition switch is turned off, and then turned from off to ON again, the engine returns to normal)
    The shift lever is operated without depressing the clutch pedal The buzzer sounds and stop and start indicator light blinks (engine will not start)

  4. WARNING INDICATOR AND BUZZER OPERATION

    A004SX2E05
    Text in Illustration
    *a

    Stop and Start Indicator Light

    (Green)
    *b

    Stop and Start Cancel Indicator Light

    (Yellow)

    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

    (Green)

    Stop and start cancel indicator light

    (Yellow)

    		 Buzzer
    For 3 seconds after the ignition switch to ON Normal operation Does not come on Does not come on (Color Type) Does not sound
    Come on (Monochrome Type)
    During stop and start control operation (engine is stopped) Normal operation Come on Does not come on Does not sound
    The shift lever is operated without depressing the clutch pedal The blinking interval is 0.15 seconds. Does not come on Sounds
    Control is prohibited by the stop and start system cancel switch (ecorun cancel switch assembly) Normal operation Does not come on Come on Does not sound
    Diagnostic trouble code Any DTCs are stored Does not come on The blinking interval is 0.5 seconds. Does not sound
    Starter life The number of times the starter has been operated exceeds its limit Does not come on The blinking interval is 0.5 seconds. Does not sound

  5. STOP AND START SYSTEM OPERATION CONDITION DISPLAY FUNCTION

    When the engine cannot be stopped by the stop and start system, when the engine automatically restarts while stopped by the stop and start system, and when the engine is stopped by the stop and start system and the shift lever is shifted into a position other than neutral with the clutch pedal released, the following messages are displayed on the multi-information display.


    1. When the engine cannot be stopped by the stop and start system (Color Type)

      Message Details/Actions
      "For climate control"

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


        • Readily operates when the difference between the set temperature and cabin temperature is small.

      • The windshield defogger is turned on.

      • The power heater is turned on.
      "Battery charging"

      • The battery charge amount may be low.


        • Engine stop is temporarily prohibited to prioritize charging of the battery, but if the engine is operated for a short while, engine stop is allowed.

      • A refresh charge may be occurring (Examples: A short time after replacing the battery, removing battery terminals, etc.)


        • After a refresh charge of approximately 5 to 40 minutes completes, the system can be operated.

      • The engine may have been started with the hood opened.


        • Close the hood, turn the ignition switch off, wait for a while, and then start the engine.

      • The battery may be cold.


        • Operating the engine for a short while allows the system to recover due to the temperature increase in the engine compartment.

      • The battery may be extremely hot.


        • If the engine is stopped and the engine compartment is allowed to cool sufficiently, the system recovers.
      "For brake system"

      • The brake booster load decreased.

      • The vehicle is operated at a high elevation.


        • When a predetermined load is generated by the brake booster, the system recovers.
      "Driver seat belt unbuckled" The driver seat belt is not fastened.
      "Bonnet open" The hood is opened.

    2. When the engine automatically restarts while stopped by the stop and start system (Color Type)

      Message Details/Actions
      "For climate control"

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

      • The windshield defogger is turned on.

      • The power heater is turned on.
      "For brake system"

      • The brake pedal is strongly depressed further or pumped.


        • When a predetermined load is generated from the brake booster by driving the vehicle, the system recovers.
      "Battery charging"

      • The battery charge amount may be low.


        • The engine is restarted to prioritize battery charging. Operating the engine for a short while allows the system to recover.
      "Steering wheel turned" The steering wheel is turned.
      "Driver seat belt unbuckled" The driver seat belt is not fastened.

    3. When the shift lever is shifted into a position other than neutral with the clutch pedal released while the engine is stopped by the stop and start system

      Message Actions
      "Stop & Start system active. Shift to N and depress clutch to restart." Shift the shift lever to neutral and depress the clutch pedal. The engine restarts.

  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 is not supplied to the engine stop and start ECU Stop and start control prohibited Wire harness or connector
    TMN (neutral position sensor (neutral position switch)) circuit Open P1780

    • Neutral Switch

    • N position Switch

    • N Position Voltage Status

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • Wire harness or connector

    • Neutral position sensor (neutral position switch)
    Shorted P1780

    • Neutral Switch

    • N position Switch

    • N Position Voltage Status

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks
    CLL (clutch start switch assembly) circuit Stuck on P0831

    • Clutch Lower SW

    • N/Clutch Lower SW Abnoml

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • Wire harness or connector

    • Clutch start switch assembly
    Stuck off - Clutch Lower SW Stop and start control prohibited
    BNT1 (engine hood courtesy switch (hood lock assembly)) circuit Stuck on - Hood Courtesy Switch The engine does not stall when the engine hood is opened with the shift lever in neutral while the engine is 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 the 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

    • Check valve to connector tube hose
    Shorted P1540
    Remains at intermediate value P1541
    ECAN (stop and start system cancel switch (ecorun cancel switch assembly)) circuit Stuck on - Cancel Switch Stop and start control prohibited

    • Wire harness or connector

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

    • Wire harness or connector

    • ST relay

    • Engine stop and start ECU
    Stuck on P1644

    • Wire harness or connector

    • ST 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 fuse

    • Wire harness or connector

    • Engine stop and start ECU

    • Battery

    • ECUs and sensors connected to BO1 and IGO1

    • Open

    • Shorted

    • Internal circuit

    • 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 fuse

    • Wire harness or connector

    • Engine stop and start ECU

    • Battery
    VB- circuit Open P0560 VB Voltage Low

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • Wire harness or connector

    • Engine stop and start ECU
    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
    Sensor power source circuit Malfunction P0641 State of BBC

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

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

    • Oper Permission (ECM 1)

    • Oper Permission (ECM 2)

    		 Stop and start control prohibited ECD system
    Abnormal NE signal P0335

    • NE Sensor Circuit Open2

    • Crank Pos Sen Abnoml 3

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • ECD system (crankshaft position sensor circuit)

    • Wire harness or connector
    Battery current sensor malfunction DTCs for charging system output

    • Battery Fluid Temperature

    • Integrated Current

    		 Stop and start control prohibited Charging system
    Brake control system Brake control system - 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
    Power steering system Malfunction in power steering system EPS assist current value invalid

    • EPS Load

    • Comm Err with EPS

    		 Stop and start control prohibited

    • Power steering ECU assembly

    • Torque 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 (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)

    • Front door courtesy light switch assembly (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 temp 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

    • Check valve to connector tube 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 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
    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.

    • 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 (recovers when the ignition switch is turned off)

    • Check for a 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

    U0155*

    U0164

    U1106

    		 -

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks*

    • Applicable wire harness or connector

    • Applicable ECU

    Tech Tips

    *: The stop and start cancel indicator light does not blink when a communication error with the combination meter assembly occurs.