STOP AND START SYSTEM SYSTEM DESCRIPTION


  1. STOP AND START CONTROL

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


    1. When the conditions in the following table have been met, the engine can be stopped due to Stop and Start system control.

      Item

      Condition

      (All of the following conditions are met)
      Idle Stop Ignition Switch After more than 5 seconds have been passed after the ignition switch turned to ON
      Engine Coolant Temperature 40°C to 105°C (104°F to 221°F)
      Ambient Temperature Higher than -6°C (21°F)
      Driver Door Closed
      Driver Seat Belt Driver seat belt has been fastened
      Brake Control System Proper
      Brake Booster Vacuum Sufficient brake booster vacuum
      Shift Position After one second has passed after moving the shift lever except to R
      CVT Fluid Temperature 25°C to 110°C (77°F to 230°F)
      Stop and Start Cancel Switch System control has not been prohibited using the stop and start cancel switch
      Vehicle Speed 0 km/h (0 mph) (After the engine warms up)
      Gradient of Road Surface Within the allowable gradient range (gradient of road surface below 8 degrees)
      Engine Speed 1200 rpm or less
      Hood Closed
      Battery Voltage With the starter on, minimum voltage is 7.6 V or more after cranking, and 8.14 V or more at engine start.
      Battery Temperature -10°C to 70°C (14°F 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:


        • higher than -4838 A-sec: Battery charging state is in Charge Control Coordination Mode or Low Temperature Mode.

        • higher than -864 A-sec: Battery charging control state is in 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

      Either of the following conditions is met:


      • The heater is off

      • The blower switch is on when the ambient temperature is 11°C (51.8°F) or higher or the engine coolant temperature is 56°C (132.8°F) or higher

      • Blower switch on, air conditioning switch off and 10 seconds or more have elapsed after engine restarted by stop and start control.
      Steering Steering operation speed: 45 deg/s or less

      Tech Tips


      • *1: When the battery temperature is -15°C (5°F) or lower, 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 lower, 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.

    2. When the engine has been stopped due to Stop and Start system 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

      (The negative pressure can be changed by the hydraulic brake pressure (applying pressure to the brake pedal))
      Engine Hood Courtesy Switch (Hood Lock Assembly)

      Any of the following condition is met:


      • Engine Hood Courtesy Switch (Hood Lock Assembly) malfunction

      • Engine hood is opened (Shift lever in P or N)
      SFI System SFI system malfunction is detected
      Vehicle Stability Control System Vehicle Stability Control System malfunction is detected
      Oil Pump with Motor Assembly Oil Pump with Motor Assembly malfunction
      Power Steering System Power Steering System malfunction 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 System

      Both of the following condition is met:


      • Blower switch: ON

      • Evaporator temperature is at the threshold value or higher (the threshold value changes depending on various factors such as 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

      • Stop and start priority control is switched back to the normal control.
      Battery Battery performance or voltage drops
      Vehicle Speed Vehicle speed signal is input
      Driver Door Driver door is opened
      Driver Seat Belt Driver seat belt is unfastened
      Steering operation Steering wheel is turned 25 degrees or more
      Brake pedal release Brake fluid pressure decreases

  2. SYSTEM PROHIBIT CONTROL

    The engine stop and start ECU prohibits Stop and Start system control 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 is less than 40°C (104°F) Engine has not warmed up Engine coolant temperature is 40°C to 105°C (104°F to 221°F) Always
    Idle speed learning has not completed Stop and Start system control is prohibited until idle speed learning completes Idle speed learning has completed Always
    CVT CVT fluid temperature 25°C (77°F) or lower, 110°C (230°F) or higher CVT fluid temperature input CVT fluid temperature is within the allowable range Always
    Brake Brake booster vacuum decreases Brake booster vacuum decreases due to pumping the brakes or another reason Normal brake booster vacuum is reached Every time the vehicle stops
    Brake master cylinder fluid pressure decreases Brake pedal is not being depressed firmly enough Depress the brake pedal further
    Hill Start Control Brake control system malfunction DTC output Brake control system normalization Always
    Communication between the engine stop and start ECU and the skid control ECU (brake actuator assembly) is not effective Communication is not effective. Communication between the engine stop and start ECU and the skid control ECU (brake actuator assembly) is effective Always
    Gradient of Road Surface Not within the allowable gradient range (gradient of road surface above 8 degrees or below -8 degrees) Gradient of road surface above 8 degrees or below -8 degrees Within the allowable gradient range (gradient of road surface below 8 degrees and above -8 degrees) Always
    Air Conditioning/Heater System

    Heater:

    All of the following conditions have been met:


    • Blower switch is on

    • Outside temperature is 10°C (50°F) or less

    • Coolant temperature is less than 55°C (131°F)

    		 Heater function is not effective

    • Actual temperature is higher than target temperature

    • Blower switch is turned off

    		 During heater operation

    Cooling function:

    All of the following conditions have been met:


    • Blower switch is on

    • Air conditioning switch is on

    • Outside temperature is 23°C (73.4°F) or more

    • Evaporator temperature is 9°C (48.2°F) or more

    		 Cooling function is not effective

    • Actual temperature is lower than target temperature

    • Blower switch is turned off

    • Air conditioning system is turned off

    		 While air conditioning system (cooling function) is on

    Short time stop and start control:

    Within the certain period after restarting from idling stop (threshold varies depending on the operating condition of idling stop)

    		 Blower switch is ON

    • Blower switch is turned off

    • Evaporator temperature is within the allowable range

    		 Always

    Defogger:

    All of the following conditions have been met:


    • Defogger switch: ON

    • Blower switch: ON

    		 Fogged windows Defogger switch is off or blower switch is off Always
    Driver door Driver door is opened before engine stopped due to engine stop and start control Driver door courtesy switch ON signal is input 3 seconds after driver door is closed Always
    Engine hood Engine hood is opened before engine stopped due to stop and start control Engine hood switch OFF signal is input 3 seconds after engine hood is closed Always
    Seat belt Driver seat belt is not fastened before the engine stopped due to engine stop and start control Driver seat belt buckle switch OFF signal is input 3 seconds after driver seat belt is fastened Always
    Steering Steering wheel is operated at a turning rate of 45 deg/s or more Steering operation signal is input Hold the steering wheel Always
    Shift position R position Shift position signal is input

    • Shift lever is in P or N

    • With the brake pedal depressed, shift lever is in D or M

    		 Always
    Ambient Temperature Ambient temperature -6°C (21°F) or lower - Ambient temperature -5°C (23°F) or higher Always
    Power source With the starter on, minimum voltage is less than 7.6 V after cranking, and less than 8.14 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 75°C (167°F) or higher or -15°C (5°F) or lower Depends on outside temperature An appropriate battery temperature is reached Always
    Power source

    Battery integrated current*1 value is:


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

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


      • -4838 A-sec or less:

        Battery charging state is in Charge Control Coordination Mode or Low Temperature Mode.

      • -864 A-sec or less:

        Battery charging control state is in 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 due to Stop and Start system 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. Either of the following integrated current conditions is met:


      • -3974 A-sec or higher:

        Battery charging state is in Charge Control Coordination Mode or Low Temperature Mode.

      • 0 A-sec or higher:

        Battery charging control state is in Stop and Start Standalone Mode, Stop and Start Restriction Mode or Temperature High/Low Mode.

    		 Always
    Carried out in 30-hour intervals (varies depending on the driving condition) A refresh charge of 30 minutes or more is performed after every 20 hours of driving After 30 minutes or an hour has elapsed. Always
    Engine is started with the engine hood open (for jump starting) - Turn the ignition switch off, and then turn it ON with the engine hood closed. Every time the engine is started

    Tech Tips


    • *1: Refer to Data List items "Integrated Current" and "Battery Integrated Current" Click here.

    • If the battery terminal has been disconnected, the stop and start will be prohibited. In this case, drive the vehicle for 15 to 40 minutes to permit the stop and start operation.

    • 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.

  3. WARNING CONTROL

    If any of the following operations are performed while the engine is stopped due to Stop and Start system control, the system will perform the warning control.

    Operation Warning Control
    The driver door is opened while the shift lever is in D or M The engine starts, buzzer sounds and stop and start indicator light blinks
    The driver door is opened while the shift lever is in P or N The engine starts
    The driver seat belt is unfastened The engine starts
    The hood is opened while the shift lever is in P or N The engine starts
    The hood is opened while the shift lever is in D or M The engine stops (Engine enters stall mode, and recovers after the ignition switch is turned off and then ON.)

  4. Stop and start priority control

    The stop and start control system has 2 control modes, normal mode (NORMAL) and stop and start prioritized mode (S&S Prioritized).

    When the stop and start control is activated, it is possible to switch between different modes by pressing and holding the telltale light assembly (stop and start cancel switch assembly). The engine stop and start computer performs the control based on the selected mode in synchronization with the air conditioning amplifier assembly. If the stop and start prioritized mode (S&S Prioritized) is selected, the activation period of stop and start control when the air conditioning is on becomes longer than the normal mode (NORMAL) to improve fuel efficiency.

    Tech Tips


    • If the stop and start prioritized mode (S&S Prioritized) is selected, the performance of air conditioning system is affected. If there are complaints from a customer about poor performance of air conditioning system, check the selected mode of the stop and start control system. Click here

    • Depending on the vehicle condition, the activation period of stop and start control may not change even when the stop and start prioritized mode (S&S Prioritized) is selected.

  5. WARNING INDICATOR AND BUZZER OPERATION

    A005KN1E01
    Text in Illustration
    *a

    Stop and start cancel indicator light

    (Orange)
    *b

    Stop and start indicator light

    (Green)

    System control status and warnings are shown to the driver by the stop and start indicator light, stop and start cancel indicator light and the buzzer.

    If the conditions required for permission of stop and start control are met during vehicle driving, the stop and start indicator light (green) comes on to notify the driver that the stop and start control is permitted.

    Stop and Start Indicator and Buzzer Operation
    Item Condition

    Stop and start indicator

    (Green)

    Stop and start cancel indicator

    (Orange)

    		 Buzzer
    Conditions for permission of stop and start control are met during vehicle driving Normal operation Comes on Does not come on Does not sound
    While the engine is stopped by stop and start system Normal operation Comes on Does not come on Does not sound
    Driver door is opened The blinking interval is 0.15 seconds*1 Sounds*1
    After restarting, the engine is stopped by stop and start system Driver door is opened within 5 seconds The blinking interval is 0.15 seconds*1 Sounds*1
    Control is prohibited by the stop and start cancel switch Normal operation Does not come on Comes 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

    *1: While the shift lever is in D or M

  6. EFFECT OF MALFUNCTION ON STOP AND START SYSTEM OPERATION

    Depending on the malfunction, Stop and Start system control may be prohibited as a fail-safe function. The following table shows effects on the vehicle and areas to be inspected according to malfunctions in the Stop and Start system.

    Malfunctioning Area Malfunction DTC Output Data List Effect on Vehicle Area to be Inspected
    IG SW circuit Open P2531 IG Switch Stop and Start system control prohibited 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 system control prohibited Harness or connector
    NSW (park/neutral position switch) circuit Stuck on P1780

    • Neutral Switch

    • Neutral Switch Stuck OFF

    • Neutral SW Abnormal (ON)

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • Wire harness or connector

    • Park/neutral position switch
    Stuck off P1780

    • Neutral Switch

    • Neutral Switch Stuck OFF

    • Neutral SW Abnormal (OFF)

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks
    BNT1 (hood lock switch) circuit Stuck on - Hood Courtesy Switch When the engine is stopped by stop and start control system, the engine does not stall even when the engine hood is opened with the shift lever in D or M

    • Harness or connector

    • Hood lock switch
    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

    • Harness or connector

    • Vacuum sensor assembly

    • Brake booster

    • Brake booster hose
    Shorted P1540
    Remains at intermediate value P1541
    ECAN (stop and start cancel switch) circuit Stuck on - Cancel Switch Stop and Start system control prohibited

    • Harness or connector

    • Stop and start cancel switch
    Stuck off - Cancel Switch Stop and Start system control cannot be canceled by pressing the stop and start cancel switch
    NOPM, OPM1, OPO (CVT oil pump motor) circuit

    • Open

    • Short

    • Internal malfunction

    P1538

    P1539

    • Oil Pump Relay

    • Oil Pump Status

    • Oil Pump Duty

    • State of Oil Pump 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 system control prohibited

    • Stop and start cancel indicator blinks

    • Harness or connector

    • Engine stop and start ECU

    • CVT assembly (oil pump motor)

    • Oil pump control relay
    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

    • Harness or connector

    • ST/MGC relay

    • Engine stop and start ECU
    Stuck on P1644

    • Harness or connector

    • ST/MGC 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

    • Harness or connector

    • Engine stop and start ECU

    • Battery

    • ECUs and sensors connected to BO1 and IGO1

    • Open

    • Shorted

    • Internal circuit malfunction

    • Battery

    		 P323B

    • State of BBC

    • BBC Duty

    • BBC Thermistor

    • BBC Abnoml

    • BBC OverHeat

    • BBC Power Low

    • BBC fuse

    • 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

    • 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 (memory in the engine stop and start ECU) Malfunction P062F EEPROM

    • Stop and start system control prohibited

    • Stop and start cancel indicator 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
    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 Malfunction
    Malfunctioning Area Malfunction DTC Output Data List Effect on Vehicle Area to be Inspected
    SFI MIL illuminated DTCs for SFI system output Oper Permission (ECM1) Stop and Start system control prohibited SFI system
    Abnormal NE signal P0335

    • NE Sensor Circuit Open 2

    • Ne Sensor Circuit Open 3

    • Stop and start control prohibited

    • Stop and start cancel indicator light blinks

    • SFI system (crank position sensor circuit)

    • Harness or connector
    Crankshaft reverse rotation detection P0336 -

    • Stop and start control prohibited

    • MIL illuminated

    		 SFI system (crank position sensor circuit)
    Battery current sensor (generator control ECU assembly) malfunction

    P0516

    P0517

    P1550

    P1551

    P1552

    • Battery Fluid Temperature

    • Integrated Current

    		 Stop and start control prohibited Charging system
    CVT The electric oil pump is abnormal. P0942 Oper Permission (AT/CVT) Stop and Start system control prohibited CVT system
    ABS/VSC ABS operating - ABS Running Stop and Start system control prohibited -
    Malfunction in wheel speed sensor Brake control system DTCs output

    • Vehicle Spd 1(ABS/VSC)

    • Wheel Speed Malfunction

    		 Stop and Start system control prohibited

    • Harness or connector

    • Skid control ECU (brake actuator assembly)

    • Vehicle speed sensor
    EPS Malfunction in the power steering system EPS assist current value invalid

    • EPS Load

    • Comm Err with EPS

    		 Stop and Start system control prohibited

    • Power steering ECU

    • Torque sensor
    Seat belt warning system Malfunction in the 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)

    • Harness or connector
    Driver door courtesy light switch circuit Malfunction in the 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

    • Sounds the warning buzzer

    • Front door courtesy light switch assembly (Driver side)

    • Driver door courtesy light switch circuit
    Air conditioning system Malfunction in outside temperature sensor Air conditioning system DTCs output Ambient Temp Sensor Stop and Start system control prohibited Ambient Temp Sensor circuit
    Brake 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 system control prohibited

    • Engine vacuum system

    • Vacuum sensor

    • Brake booster assembly

    • Vacuum hose
    Power source Malfunction in backup boost converter (voltage may have dropped) P323B

    • State of BBC

    • BBC Duty

    • BBC Thermistor

    • BBC Abnorml

    • BBC Over Heat

    • BBC Power Low

    • Stop and Start system control prohibited

    • Stop and start cancel indicator blinks

    • Harness or connector

    • Engine stop and start ECU

    • BBC fuse

    • Battery
    Malfunction in charging system - Alternator Status Stop and Start system control prohibited Charging system
    Low voltage P0562 Battery Abnormal

    • Stop and Start system control prohibited

    • Stop and start cancel indicator blinks

    • Wire harness or connector

    • Battery

    • Relay
    Number of starter operations Exceeds the specified limit P1545 Starter Count Error

    • Stop and Start system control prohibited

    • Stop and start cancel indicator blinks

    • Starter assembly replacement is required.

    • Fuse replacement is required.

    • ST Relay 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 starting Engine started with the engine hood open - Eng Start Req (Engine Hood Open)

    Stop and Start system control prohibited

    (resumes when the ignition switch is turned off)

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

    • Engine hood courtesy switch
    CAN communication Communication interrupted

    • U0100

    • U0121

    • U0126

    • U0131

    • U0140

    • U0151

    • U0155

    • U0164

    		 -

    • Stop and Start system control prohibited

    • Stop and start cancel indicator blinks

    Tech Tips

    If the harness between stop and start ECU and combination meter is open, stop and start cancel indicator does not blink.

    • Applicable harness or connector

    • Applicable ECU