СИСТЕМА ЗАПУСКА И ОСТАНОВА

FUNCTION OF MAIN COMPONENTS

Component		Function
Engine Stop and Start ECU		Sends either an engine stop or restart signal to the ECM according to the signals from each sensor and switch.
Engine Stop and Start ECU	Backup Boost Converter	Supplies battery voltage to help make up for the voltage drop that occurs when the engine is restarted, preventing the operation of various systems from being interrupted due to low battery voltage.
Clutch Switch Assembly		Recognizes that the clutch pedal is depressed and sends a signal to the engine stop and start ECU.
Neutral Position Switch		Recognizes that the shift lever is in N and sends a signal to the engine stop and start ECU.
Brake Vacuum Pressure Sensor		Detects the brake booster vacuum pressure and sends a signal to the engine stop and start ECU.
Hood Lock Assembly	Engine Hood Courtesy Switch	Detects whether the hood is open or closed and sends a signal to the engine stop and start ECU.
Front Door Courtesy Light Switch Assembly (Driver Side)		Detects whether the driver door is open or closed and sends a signal to the engine stop and start ECU via the main body ECU (multiplex network body ECU) via CAN communication.
Front Seat Inner Belt Assembly (Driver Side)	Front Seat Belt Buckle Switch (Driver Side)	Detects whether or not the driver's seat belt has been fastened, and sends a signal to the engine stop and start ECU via the main body ECU (multiplex network body ECU) via CAN communication.
Air Conditioning Amplifier Assembly		Sends an outside temperature signal and A/C switch signal to the engine stop and start ECU.
Combination Meter Assembly	Stop and Start Indicator Light	Turns on when the engine is stopped due to stop and start system control. If the shift lever is moved out of N without the clutch pedal depressed during idling stop, the buzzer sounds and the stop and start indicator light blinks at the same time.*
	Stop and Start Cancel Indicator Light	Turns on to inform the driver that the system has been disabled when stop and start system operation is prohibited by the stop and start system cancel switch assembly.
	Stop and Start Cancel Indicator Light	If a system malfunction is detected or the operation count of the starter assembly exceeds a threshold, the stop and start cancel indicator light blinks to inform the driver.
	Multi-information Display	Displays information based on the selected display mode. One display mode shows the current idling stop time, the idling stop time since the ignition switch was turned ON and the total idling stop time since the last time the idling stop time was reset. The other display mode shows the current idling stop time, the fuel consumption amount since the ignition switch was turned ON and the total fuel consumption amount since the last time the idling stop time was reset. Displays the settings of the stop and start system or warning information, etc.
Stop and Start System Cancel Switch (Ecorun Cancel Switch Assembly)		Operation of the system can be canceled by pressing the stop and start system cancel switch (ecorun cancel switch assembly). Pressing the switch again or turning the power source off and back on restores the operation of the system.
Generator Control ECU Assembly		Detects the battery temperature and how much power is being charged to or discharged from the battery and sends signals to the ECM. These signals are used to protect the battery.
ECM		Sends various information about engine conditions to the engine stop and start ECU.
Skid Control ECU		Sends a vehicle speed signal to the engine stop and start ECU.
Center Airbag Sensor Assembly		Sends airbag deployment information in the event of a collision and a deceleration signal to the engine stop and start ECU.
Main Body ECU (Multiplex Network Body ECU)		Sends a front door courtesy light switch (driver side) signal and front seat belt buckle switch (driver side) signal to the engine stop and start ECU.
Power Steering ECU Assembly		Sends an electrical power steering assist signal to the engine stop and start ECU. Sends a power steering torque sensor signal to the engine stop and start ECU.

Tech Tips

*: If the shift lever is moved back to N, the buzzer stops sounding and the stop and start indicator light stops blinking.

OPERATING CONDITION

Operating Conditions at Engine Stop and Restart

The engine may stop if all of the following conditions are detected:

Item		Operating Condition
Idle Stop	Engine Coolant Temperature	A predetermined temperature*1 to 105°C (221°F)
	Outside Temperature	-5°C (23°F) or more
	Driver's Door	Closed
	Driver's Seat Belt	Fastened
	Brake Booster Vacuum	Sufficient brake booster vacuum
	Stop and Start System Cancel Switch (Ecorun Cancel Switch Assembly)	Off condition
	Vehicle Speed	0 km/h (0 mph)
	Engine Speed	1250 r/min or less
	Accelerator Pedal Condition	Released
	Clutch Pedal	Released
	Shift Lever Position	Neutral
	Engine Hood	Closed
	Battery Voltage	6.6 or more at engine start
	Battery Temperature	-10°C to 70°C (14°F to 158°F)*2
	Battery Integrated Current*3	When the integrated current value meets any of the following conditions: -5299 A-sec or more: Status of Battery Charge Control is Charge Control Coordination Mode or Low Temperature Mode4 0 A-sec or more: Status of Battery Charge Control is Stop and Start Standalone Mode, Stop and Start Restriction Mode or Temperature High/Low Mode4
	Air Conditioning	The cooling, heating and defrost functions are not operating.
	Heater	Off, or on with an outside temperature of 5°C (41°F) or higher and an engine coolant temperature of 55°C (131°F) or higher, or a cabin temperature -5°C or less than the set temperature (normal mode setting).
	Steering Operation	Not operated

*1: The lowest operating temperature is determined by environmental conditions.

*2: When the battery temperature becomes -15°C or lower or 75°C or higher, control is prohibited. After control is prohibited and the battery temperature rises to -10°C or higher or falls to 70°C or lower, control is performed.

*3: Regarding Battery Integrated Current

In the stop and start system, the engine stop and start ECU switches the system control mode (stop and start system control permitted/prohibited) based on the battery condition (charge/discharge condition) to protect the battery and to ensure stable engine restarting performance. The battery charge-discharge condition is determined from the integrated current value calculated from the generator control ECU assembly. The integrated current value is obtained by multiplying the current (ampere) detected by the generator control ECU assembly by the time (seconds), and the resulting value is expressed in the unit A-sec. This can be measured by the Global TechStream (GTS). The engine stop and start ECU determines the power charge based on the integrated current value and prohibits stop and start system control if the value is below the threshold, because the battery might not be able to start the engine. The threshold varies according to the battery temperature and battery charge condition.

*4: After the integrated current value becomes -6451 A-sec or less or -1152 A-sec or less, respectively, in order to charge the battery, control is prohibited until the value becomes - 5299 A-sec or more or 0 A-sec or more, respectively.

The engine will restart if any of the following conditions are detected:

Item		Operating Condition
Engine Restart	Brake Booster Vacuum	The brake booster vacuum is insufficient.
	Air Conditioning	When all of the following conditions are met: - The blower switch is on. - The evaporator temperature meets or exceeds the threshold, or a certain period of time elapses after idling stop is performed (threshold changes due to the environment around the vehicle).
	Heater	Tthe timer in the air conditioning amplifier assembly operates.
	Air Conditioning/Heater	The A/C switch is turned on. When the stop and start setting changes from "Extended mode" to "Normal" mode.
	Stop and Start System Cancel Switch (Ecorun Cancel Switch Assembly)	The stop and start system cancel switch (ecorun cancel switch assembly) is turned on.
	Power Heater Switch*	The heater switch assembly is turned on.
	Battery	The battery voltage is less 11.4 V The battery integrated current drops to below the threshold value.
	Driver's Door	The driver's door is opened.
	Driver's Seat Belt	The driver's seat belt is unfastened.
	Vehicle Speed	A vehicle speed signal is input.
	Clutch Pedal	The clutch pedal is depressed.
	Steering Operation	The steering wheel is operated.

*: Models with combustion type power heater

FUNCTION

Settings of Stop and Start System
1. Using the steering pad switch on the steering pad switch assembly and the multi-information display on the combination meter assembly, the engine stop operation time due to stop and start control when the air conditioning system is on can be changed between "Standard" and "Extended" (the stop and start system has priority).

SYSTEM CONTROL

System Prohibit Control

For safety, battery protection, comfort and ECU learning reasons, the engine stop and start ECU prohibits stop and start system operation if any one of the following conditions is met:

Prohibition Reason	Condition
Safety	If the engine is started with the hood open, such as when jump starting, engine restart operation cannot be ensured. Therefore, stop and start system operation will be prohibited. The operation of the system will be restored on the next trip.
	If the driver door or hood is opened before the engine stops, stop and start system operation will be prohibited.
	The brake booster vacuum is insufficient.
	If the engine stop and start ECU receives an airbag deployment signal in the event of a collision, stop and start system operation will be prohibited.
	If the driver's seat belt is unfastened before the engine stops.
Battery Protection	While recharging, stop and start system operation will be disabled. The recharging continues for 0.5 to 1 hour, and is carried out approximately every 20 hours or driving.
	When the idling stop rate becomes higher than the predetermined rate, stop and start system operation will be disabled.
	When the battery becomes low and the battery integrated current value drops to below the threshold value, stop and start operation will be disabled.
Comfort	If the air conditioning is on when the outside temperature is high and the evaporator temperature is high, stop and start system operation will be prohibited.
	If the heater is on when the outside temperature is low and the engine coolant temperature is low, stop and start system operation will be prohibited.
	If the front DEF switch (air conditioning control assembly) and blower switch (air conditioning control assembly) are on, stop and start system operation will be prohibited.
	If the power heater switch* is turned on, stop and start system operation will be prohibited.
Operability	When the steering wheel is operated at a torque of 2.7 N*m or more, the stop and start system operation will be prohibited in order to suppress excessively large fluctuations of the torque assist carried out by the EPS.

*: Models with combustion type power heater

DIAGNOSIS

When the engine stop and start ECU detects a malfunction and CAN communication is normal, the engine stop and start ECU records information related to the malfunction. Furthermore, the stop and start cancel indicator light in the combination meter assembly blinks to inform the driver that CAN communication is normal.
The engine stop and start ECU also stores Diagnostic Trouble Codes (DTCs) related to malfunctions. DTCs can be read using the Global TechStream (GTS).