STOP AND START SYSTEM

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.

When all of 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	Engine Switch	After more than 5 seconds have passed after the engine switch turned on (IG)
	Engine Coolant Temperature	40°C to 105°C (104°F to 221°F)
	Ambient Temperature	Higher than -5°C (23°F)
	Driver Door	3 seconds have elapsed after driver door closed
	Driver Seat Belt	3 seconds have elapsed after driver seat belt fastened
	Brake Control System	Normal
	Brake Booster Vacuum	Sufficient
	Brake Master Cylinder Fluid Pressure	1100 kPa (11.2 kgf/cm², 160 psi) or higher (changes according to gradient)
	Shift Position	1 second or more has passed after moving the shift lever to D
	Drive Mode	NORMAL or ECO mode
	Automatic Transaxle Fluid Temperature	25°C to 113°C (77°F to 235.4°F)
	Stop and Start Cancel Switch (Integration Control and Panel 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*1	-10°C to 70°C (14°F to 158°F)
	Battery Integrated Current*2	One of the following conditions is met: Higher than -17971 A-sec: "Status of Battery Charge Control"3 is Charge Control Coordination Mode or Stop and Start Standalone Mode Higher than -8064 A-sec: "Status of Battery Charge Control"3 is Low Temperature Mode and "Battery Fluid Temperature" is between 3°C (37.4°F) and 11°C (51.8°F) Higher than -5299 A-sec: "Status of Battery Charge Control"3 is Low Temperature Mode and "Battery Fluid Temperature" is between -1°C (30.2°F) and under 3°C (37.4°F) Higher than 0 A-sec: "Status of Battery Charge Control"3 is 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: 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 (-9°F) higher than the set temperature
	Steering Operation	Less than 45 deg/s
	Engine Control	Engine catalytic rapid warm-up is completed

Tech Tips

*1: 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.
*2: Read the Data List item "Integrated Current" or "Oper Permission (Integrated Current)" when checking the integrated current value Click here.
*3: Please refer to the Data List "Status of Battery Charge Control" for information about the status of the battery charge control.

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 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 (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
	Battery	Battery performance or voltage drops (Below 11.4 V)
	Battery Integrated Current*	The accumulated value of discharge current during engine stop is too large (over 6912 A-sec)
	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 deg or more
	Brake Pedal	Any of the following conditions is met: Brake pedal released (brake fluid pressure decreases) Brake master cylinder fluid pressure: 1000 kPa (10.2 kgf/cm², 145 psi) or more
	Accelerator Pedal	Accelerator pedal is depressed
	Shift Position	Move the shift lever from D to other than D.
	Drive Mode Switch	Drive mode is changed from ECO or NORMAL to SPORT.
	Stop and Start System Cancel Switch (Integration Control and Panel Assembly)	Off (System control is not prohibited) → On (System control is prohibited)

Tech Tips

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

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
Engine	Idle speed learning has not completed	Stop and start system control prohibited until idle speed learning completes	Idle speed learning has completed	Always
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	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 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°)	Always
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 lower than set temperature by -5°C (23°F) or less (Only standard control (NORMAL) mode)	Heater performance decreases	Actual temperature higher than target temperature Blower switch is 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)): Evaporator temperature 9°C (48.2°F) or higher Cabin temperature higher than set temperature by 3°C (5°F) or higher, or blower level 16 or higher (Only standard control (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: Any of the following conditions are met: Defogger switch on Blower switch on	Fogging of windows	Defogger switch or blower 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) Certain amount of time has elapsed after the engine is stopped by stop and start control (threshold value varies with stop and start operation conditions)	Blower switch on	Blower switch off and evaporator temperature within specified range	Always
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 Transaxle	Automatic transaxle oil temperature lower than 25°C (77°F) or 111°C (231.8°F) or higher	Automatic transaxle oil temperature signal is input	An appropriate automatic transaxle fluid temperature is reached	Always
Shift Position	Shift lever in other than D	Shift position signal input	Brake pedal depressed and shift lever in D	Always
Ambient Temperature	Ambient temperature -6°C (21°F) or lower	-	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 is charged or replaced	Every time the engine is 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
	Battery integrated current1 value meets one of the following conditions: -19123 A-sec or less: "Status of Battery Charge Control"2 is Charge Control Coordination Mode or Stop and Start Standalone Mode -9216 A-sec or less: "Status of Battery Charge Control"2 is Low Temperature Mode and "Battery Fluid Temperature" is between 3°C (37.4°F) and 11°C (51.8°F) -6451 A-sec or less: "Status of Battery Charge Control"2 is Low Temperature Mode and "Battery Fluid Temperature" is between -1°C (30.2°F) and under 3°C (37.4°F) -1152 A-sec or less: "Status of Battery Charge Control"*2 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)	Battery integrated current1 value meets both of the following conditions: -17971 A-sec or higher: "Status of Battery Charge Control"2 is Charge Control Coordination Mode or Stop and Start Standalone Mode -8064 A-sec or higher: "Status of Battery Charge Control"2 is Low Temperature Mode and "Battery Fluid Temperature" is between 3°C (37.4°F) and 11°C (51.8°F) -5299 A-sec or higher: "Status of Battery Charge Control"2 is Low Temperature Mode and "Battery Fluid Temperature" is between -1°C (30.2°F) and under 3°C (37.4°F) 0 A-sec or higher: "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 higher than 50% or total idling stop rate is higher than 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" or "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.

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	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	The engine starts, warning buzzer sounds and stop and start indicator light blinks
The driver seat belt is unfastened	The engine starts

WARNING INDICATOR AND BUZZER OPERATION

Text In Illustration
*a	Stop and Start Cancel Indicator
*b	Stop and Start Indicator

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

Stop and Start Indicator and Buzzer Operation
Item	Condition	Stop and start indicator (Green)	Stop and start cancel indicator (Orange)	Buzzer
For 3 seconds after the engine switch is turned on (IG)	Normal operation	Come on	Come on	Does not sound
During stop and start control operation (engine is stopped)	Normal operation	Come on	Does not come on	Does not sound
During stop and start control operation (engine is stopped)	Driver door is opened	The blinking interval 0.15 seconds*		Sounds*
After engine started by stop and start control	Driver door is opened within 5 seconds of engine start	The blinking interval 0.15 seconds*		Sounds*
Control is prohibited by the stop and start cancel switch (integration control and panel 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 interval	Does not sound
Starter assembly life	The number of times the starter has been operated exceeds its limit	Does not come on	Blinks at 0.5 second interval	Does not sound

*: Shift lever in D

EFFECT OF MALFUNCTION ON 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 malfunctions in the stop and start system.

Malfunctioning Area	Malfunction	DTC Output	Data List / Freeze Frame Data	Effect on Vehicle	Area to be Inspected
IG2 circuit	Open	P2531	IG Switch IG SW Abnoml	Stop and start system 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 system 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
CLL (park/neutral position switch assembly) circuit	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 (hood lock assembly) circuit	Stuck on	-	Hood Courtesy Switch	Mode does not change to "stalled" when engine hood opened with shift lever in D 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 the engine hood being closed
ECAN (stop and start cancel switch (integration control and panel assembly)) circuit	Stuck on	-	Cancel Switch	Stop and start system control prohibited	Wire harness or connector Stop and start cancel switch (integration control and panel assembly)
	Stuck off	-	Cancel Switch	Stop and start system control cannot be canceled by pressing the stop and start cancel switch (integration control and panel assembly)
NOPM, OPM1, OP21 circuit (oil pump assembly with motor (automatic transaxle assembly))	Open Short 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 system control prohibited Stop and start cancel indicator blinks	Wire harness or connector Engine stop and start ECU Oil pump assembly with motor (automatic transaxle assembly)
Oil pump assembly with motor (automatic transaxle assembly)	Oil pump with motor assembly malfunction	P0942	Oper Permission(AT/ CVT)	Stop and start control prohibited	Oil pump assembly with motor (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
BBC (backup boost converter) circuit	Open Shorted Internal circuit malfunction Battery	P323B	State of BBC BBC Duty BBC Thermistor BBC Abnoml BBC Over Heat BBC Power Low		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_PA 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 Wire harness or connector
EEPROM	Malfunction	P062F	EEPROM	Stop and start system control prohibited Stop and start cancel indicator 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 / Freeze Frame Data	Effect on Vehicle	Area to be Inspected
SFI system	MIL illuminated	DTCs for SFI system output	Oper Permission (ECM1) Oper Permission (ECM2)	Stop and start system control prohibited	SFI system
	Abnormal NE signal	DTCs for SFI system output	NE Sensor Circuit Open 2	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)
Charging system	Battery state sensor malfunction	DTCs for Charging system output	Battery Fluid Temperature Integrated Current	Stop and start control prohibited	Charging system
Vehicle stability control system	Vehicle stabilty control running	-	ABS Running	Stop and start control prohibited	-
Vehicle stability control system	Malfunction in wheel speed sensor	Brake control system DTCs output	Vehicle Spd 1(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 the 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 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 (LH) Wire 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 (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 temperatue 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 Abnorml BBC Over Heat BBC Power Low	Stop and start system control prohibited Stop and start cancel indicator 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 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 blinks	Starter assembly replacement is required. Fuse replacement is required. ST Relay replacement is required. ST NO. 2 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 control prohibited (permitted when the engine switch is turned off)	Check for a history of roadside service or jump starting due to a dead battery Engine hood courtesy switch (Hood lock assembly)
CAN communication	Communication interrupted	U0100 U0121 U0126 U0131 U0140 U0151 U0164 U1110	-	Stop and start system control prohibited Stop and start cancel indicator blinks*	Applicable 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.

STOP AND START SYSTEM SYSTEM DESCRIPTION