STOP AND START

FUNCTION OF MAIN COMPONENTS

Component		Function
Engine Stop and Start ECU Backup Boost Converter		Sends either an engine stop or restart signal to the ECM according to the signals from each sensor and switch. 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. Supplies battery voltage to the oil pump motor assembly.*1
Starter Assembly		Starts the engine.
Generator Assembly		Transmits the power generating conditions to the power management control ECU.
Oil Pump Motor Assembly*1		Holds the CVT oil pressure while idle stop. This integrates the oil pump motor driver.
No. 2 Clutch Start Switch Assembly*2		Recognizes that the clutch pedal is not depressed and sends a signal to the engine stop and start ECU.
Clutch Start Switch Assembly*2		Recognizes that the clutch pedal is depressed and sends a signal to the engine stop and start ECU.
Neutral Position Switch*2		Recognizes that the shift lever is in N and sends a signal to the engine stop and start ECU.
Park/neutral Position Switch Assembly*1		Recognizes that the shift lever position and sends a signal to the engine stop and start ECU.
Stop Light Switch Assembly		Detects that the brake pedal is in a released condition, and transmits this information via the ECM to the 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.
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 (Driver)		Detects whether the 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 Belt Buckle Switch (Driver)		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.*1
Stop and Start System Cancel Switch Assembly (Warning Canceling Switch Assembly)		The operation of the system can be cancelled by pressing the stop and start system cancel switch assembly (warning canceling switch assembly). Pressing the switch again or turning the power source off and back on restores the operation of the system.
Battery Current Sensor Assembly Battery Temperature Sensor		Detects the battery temperature and how much power is being charged to or discharged from the battery and sends signals to the power management control ECU. These signals are used to protect the battery.
Crank Position Sensor		Detects the crank angle when the engine stops and transmits that information to the ECM.
Ambient Temperature Sensor (Thermistor Assembly)		Detects ambient temperature and outputs it to the combination meter assembly.
Steering Angle Sensor		Detects the steering direction and angle of the steering wheel.
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	When the engine is stopped due to stop and start system control, if the driver door is opened, the buzzer sounds and the stop and start indicator light illuminates to inform the driver that the engine was stopped due to stop and start system control. (Engine restarts)
	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 stop and start system cancel switch assembly (warning canceling switch assembly). If a system malfunction is detected, the stop and start cancel indicator light blinks to inform the driver.
	Multi-information Display (ECO Time and ECO Odometer)	Displays the total time the engine was stopped due to stop and start system control from the time the ignition switch was turned ON until the ignition switch was turned off, and also the overall total time the engine was stopped due to stop and start system control since the last reset.
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. Transmits the brake fluid pressure signal to the engine stop and start ECU. Maintains the brake fluid pressure from the time the brake pedal is released until driving force is generated when the engine is stopped due to stop and start system control.
Airbag Sensor Assembly		Sends airbag deployment information in the event of a collision and deceleration signal to the engine stop and start ECU.
Power Management Control ECU		Transmits the battery current sensor assembly signal to the engine stop and start ECU.
Radio and Display Receiver Assembly*3		Power will be supplied from the engine stop and start ECU during idle stop or when restarting the engine.
ST Relay, ST No. 2 Relay*4		Operates the starter assembly by the on signals from the engine stop and start ECU.

*1: Models with CVT
*2: Models with M/T
*3: Models with radio and display receiver assembly
*4: Models with tandem solenoid starter assembly

OPERATING CONDITION

Operating conditions at engine stop and restart

The engine may stop if all of these conditions are detected.

Tech Tips

At battery temperatures of -15°C (5°F) or below, or 75°C (167°F) or above, stop and start system control is prohibited. When stop and start system control is prohibited, after the battery temperature returns to -10°C (14°F) or higher, and 70°C (158°F) or lower, stop and start system control will be permitted.
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 battery current sensor signal. The integrated current value is obtained by multiplying the current (ampere) detected from the battery current sensor by the time (seconds), and it 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 it 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 values according to the battery temperature and battery charge condition.

Models with 1KR-FE engine
Item		Operating Condition
Engine Stop	Engine Coolant Temperature	40°C to 105°C (104°F to 221°F)
	Outside Temperature	Higher than -5°C (23°F)
	Driver Door	After closed, 3 seconds elapsed.
	Brake Booster Vacuum	Sufficient brake booster vacuum
	Stop and Start System Cancel Switch Assembly (Warning Canceling Switch Assembly)	OFF (Not a system control stopped state)
	Vehicle Speed	0 km/h (0 mph) Vehicle has been driven at 7 km/h (4.4 mph) or more (first operation of control only, second operation of control is 2 km/h (1.2 mph) or more).
	Engine Speed	Below 1200 rpm
	Clutch Pedal	Released
	Shift Lever Position	Neutral
	Driver's Seat Belt	After the driver's seat belt fastening, after 3 seconds.
	Engine Hood	After closed, 3 seconds elapsed.
	Battery Voltage	After starter operation, Min Volt (After Cranking) is 8.8 V or more, and Min Voltage (Cranking) is 8.8 V or more.
	Battery Temperature	-10°C to 70°C (14°F to 158°F)
	Battery Integrated Current	0 A-sec or more: After engine start by ignition switch operation. When the integrated current value has increased to 0 A-sec or more at least once, after the ignition switch is turned to ON. More than -4838 A-sec: When the battery charge condition is good as well as the battery temperature being -1°C (30°F) or higher and below 70°C (158°F).* More than -864 A-sec: When battery is charging as well as the battery temperature being lower than -1°C (30°F) or 70°C (158°F) or above.*
	Air Conditioning	Except when air conditioner is cooling down, heater is warming up, or defogger control is active.
	ECM Learning	Completed

Tech Tips

*: Under each set of conditions, if the battery integrated current value has reduced to -4838 A-sec or lower, or -864 A-sec or lower, then in order to recharge the battery, stop and start system control will be prohibited until the battery integrated current value increases to -3974 A-sec or more, or 0 A-sec or more, respectively.

Models with 1NR-FE engine
Item		Operating Condition
Engine Stop	Engine Coolant Temperature	40°C to 105°C (104°F to 221°F)
	Outside Temperature	Higher than -5°C (23°F)
	Road Grade	-8° to 8°
	CVT Oil Temperature*1	25°C to 110°C (77°F to 230°F)
	Driver Door	After closed, 3 seconds elapsed.
	Brake Booster Vacuum	Sufficient brake booster vacuum
	Stop and Start System Cancel Switch Assembly (Warning Canceling Switch Assembly)	OFF (Not a system control stopped state)
	Vehicle Speed	0 km/h (0 mph) Vehicle has been driven at 7 km/h (4.4 mph) or more (first operation of control only, second operation of control is 2 km/h (1.2 mph) or more).
	Engine Speed	Below 1200 rpm
	Clutch Pedal*2	Released
	Shift Lever Position	Other than R position1 Neutral2
	Driver's Seat Belt	After the driver's seat belt fastening, after 3 seconds.
	Engine Hood	After closed, 3 seconds elapsed.
	Battery Voltage	After starter operation, Min Volt (After Cranking) is 7.6 V or more, and Min Voltage (Cranking) is 8.14 V or more.1 After starter operation, Min Volt (After Cranking) is 7.2 V or more, and Min Voltage (Cranking) is 7.2 V or more.2
	Battery Temperature	-10°C to 70°C (14°F to 158°F)
	Battery Integrated Current	0 A-sec or more: After engine start by ignition switch operation. When the integrated current value has increased to 0 A-sec or more at least once, after the ignition switch is turned to ON. More than -5544 A-sec: When the battery charge condition is good as well as the battery temperature being -1°C (30°F) or higher and below 70°C (158°F).1, 3 More than -990 A-sec: When battery is charging as well as the battery temperature being lower than -1°C (30°F) or 70°C (158°F) or above.1, 3 More than -4838 A-sec: When the battery charge condition is good as well as the battery temperature being -1°C (30°F) or higher and below 70°C (158°F).2, 4 More than -864 A-sec: When battery is charging as well as the battery temperature being lower than -1°C (30°F) or 70°C (158°F) or above.2, 4
	Air Conditioning	Except when air conditioner is cooling down, heater is warming up, or defogger control is active.
	ECM Learning	Completed

*1: Models with CVT
*2: Models with M/T

Tech Tips

*3: Under each set of conditions, if the battery integrated current value has reduced to -5544 A-sec or lower, or -990 A-sec or lower, then in order to recharge the battery, stop and start system control will be prohibited until the battery integrated current value increases to -4554 A-sec or more, or 0 A-sec or more, respectively.

*4: Under each set of conditions, if the battery integrated current value has reduced to -4838 A-sec or lower, or -864 A-sec or lower, then in order to recharge the battery, stop and start system control will be prohibited until the battery integrated current value increases to -3974 A-sec or more, or 0 A-sec or more, respectively.

Models with 1ND-TV engine
Item		Operating Condition
Engine Stop	Engine Coolant Temperature	A predetermined temperature*1 to 105°C (221°F)
	Outside Temperature	Higher than -5°C (23°F)
	Driver Door	After closed, 3 seconds elapsed.
	Brake Booster Vacuum	Sufficient brake booster vacuum
	Stop and Start System Cancel Switch Assembly (Warning Canceling Switch Assembly)	OFF (Not a system control stopped state)
	Vehicle Speed	0 km/h (0 mph) Vehicle has been driven at 7 km/h (4.4 mph) or more (first operation of control only, second operation of control is 2 km/h (1.2 mph) or more).
	Engine Speed	Below 1200 rpm
	Clutch Pedal	Released
	Shift Lever Position	Neutral
	Driver's Seat Belt	After the driver's seat belt fastening, after 3 seconds.
	Engine Hood	After closed, 3 seconds elapsed.
	Battery Voltage	After starter operation, Min Volt (After Cranking) is 6.5 V or more, and Min Voltage (Cranking) is 6.5 V or more.
	Battery Temperature	-10°C to 70°C (14°F to 158°F)
	Battery Integrated Current	0 A-sec or more: After engine start by ignition switch operation. When the integrated current value has increased to 0 A-sec or more at least once, after the ignition switch is turned to ON. More than -5544 A-sec: When the battery charge condition is good as well as the battery temperature being -1°C (30°F) or higher and below 70°C (158°F).2 More than -990 A-sec: When battery is charging as well as the battery temperature being lower than -1°C (30°F) or 70°C (158°F) or above.2
	Air Conditioning	Except when air conditioner is cooling down, heater is warming up, or defogger control is active.
	ECM Learning	Completed

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

Tech Tips

*2: Under each set of conditions, if the battery integrated current value has reduced to -5544 A-sec or lower, or -990 A-sec or lower, then in order to recharge the battery, stop and start system control will be prohibited until the battery integrated current value increases to -4554 A-sec or more, or 0 A-sec or more, respectively.

The engine will restart if any of these conditions are detected.

Models with M/T
Item		Operating Condition
Engine Restart	Brake	Insufficient brake booster vacuum.
	Air Conditioning / Heater	The timer in the air conditioning amplifier assembly operates when the air conditioning is on. The A/C switch or blower switch is turned on manually while the engine is stopped. When control is changed from stop and start system priority condition to normal condition.
	Heater Switch Assembly*1	The heater switch is turned on.
	Stop and Start System Cancel Switch Assembly (Warning Canceling Switch Assembly)	The stop and start system cancel switch (warning canceling switch assembly) is turned on.
	Battery	The battery voltage is below 11.4V. The battery integrated current drops to below the threshold value.
	Vehicle Speed	Vehicle speed signal is input (such as a slope)
	Clutch Pedal	Depressed.
	Driver's Door	Opened.
	Driver's Seat Belt	The driver's Seat Belt is unfastened.
	DPF Warning Indicator Light*2	Illuminates.

*1: Models with combustion type power heater system

*2: Models with 1ND-TV

Models with CVT
Item		Operating Condition
Engine Restart	Brake	Insufficient brake booster vacuum. Brake control system malfunction.
	Air Conditioning / Heater	The timer in the air conditioning amplifier assembly operates when the air conditioning is on. The A/C switch or blower switch is turned on manually while the engine is stopped. When control is changed from stop and start system priority condition to normal condition.
	Stop and Start System Cancel Switch Assembly (Warning Canceling Switch Assembly)	The stop and start system cancel switch (warning canceling switch assembly) is turned on.
	Battery	The battery voltage is below 11.4V. The battery integrated current drops to below the threshold value.
	Engine Hood	The engine hood is opened while the shift lever is in P or N.
	Vehicle Speed	Vehicle speed signal is input (such as a slope)
	Brake Pedal	Brake pedal released.
	Accelerator Pedal	Depressed.
	Shift Lever	Moved from D or M position to R position. Moved from P or N position to another position.
	Driver's Door	Opened.
	Driver's Seat Belt	The driver's Seat Belt is unfastened.

SYSTEM CONTROL

Early Stage Injection Control
1. Early stage injection control shortens the time it takes the engine to restart after the stop and start system stops the engine, thus allowing smooth initial acceleration.
2. The ECM memorizes the crankshaft angle detected by the crank position sensor when the engine is stopped by the stop and start system.
3. The ECM judges the injection required and decides which cylinder to ignite when the driver does restart operation. The ECM then uses this information as it starts the engine.
Stopping Position Control (Models with 1NR-FE Engine)
1. While the engine stopping operation is performed, the ECM uses ignition timing and generator assembly load torque to control the crankshaft position so that it is at the optimal position for engine start.
2. The ECM calculates the amount of electricity that needs to be generated to produce the load torque necessary for controlling and sends requests for electricity generation to the generator assembly via the power management control ECU. The ECM inputs the applied crankshaft position signal and performs feedback.
Hill-start Assist Function (Models with CVT)
1. The driving force (creep phenomenon) of a former CVT vehicle is regulated by depressing the brake pedal while stopping, and the driving force is transmitted by releasing the brake pedal when starting the vehicle. However, when starting a stop and start system equipped vehicle with its engine stopped due to the activation of the idle stop function, there is a short time delay of the driving force to be generated as the engine will start after the brake pedal is released.
2. The hill-start assist function is a system to assist starting of a stop and start system equipped vehicle on a slope to deal with the reason described above, retaining the brake hydraulic pressure until the driving force is generated, and releasing the brake hydraulic pressure automatically after the driving force is generated.

Tandem Solenoid Starter Control (Models with CVT)

Tandem solenoid starter assembly equips with a pinion push out solenoid (SL1) and a motor drive solenoid (SL2) separately so that the pinion gear can engage with the ring gear even if the engine is rotating by its inertia before fully stopping.

If there is an engine start request while the engine is rotating by its inertia before fully stopping, the engine stop and start ECU drives the pinion push out solenoid (SL1) by determining the timing to push out the pinion gear to engage with the ring gear in accordance with the state of reduction of the engine rotation. After the pinion gear and the ring gear engages and a certain period of time passes, the motor drive solenoid (SL2) is driven to crank the engine.

Text in Illustration
*1	Pinion Push Out Solenoid (SL1)	*2	Ring Gear
*3	Starter Motor	*4	Motor Drive Solenoid (SL2)
*a	Operation of Pinion Gear	*b	Operation of Starter Motor
*c	Rotating Engine	*d	Cranking

System Disable Control

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

Disable 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 disabled. The operation of the system will be restored for the next trip.
	If the driver door or hood is opened before the engine stops, stop and start system operation will be disabled for safety reasons.
	The brake booster vacuum is insufficient.
	If the driver's seat belt is unfastened before the engine stops, stop and start system operation will be disabled for safety reasons.
	If the brake pedal is not depressed with enough force, stop and start system operation will be disabled for safety reasons.
	If the brake pedal is depressed suddenly with great force, stop and start system operation will be disabled for safety reasons.
	When accelerator pedal is depressed, stop and start system operation will be disabled for safety reasons.
	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 disabled for safety reasons.
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 idle 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 disabled.
	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 disabled.
	When the outside temperature drops to -6°C (21°F) or lower, stop and start system operation will be disabled.
	If the front DEF switch and blower switch are on, stop and start system operation will be disabled (Models with automatic air conditioning).
ECM Learning	ECM learning is not complete.

Warning Control

If any of the following operations are performed while the engine is stopped due to system control, the system will not restart the engine. The driver will be warned by a buzzer, or the engine will be regarded as stalled or will be restarted.

Models with M/T
Operation	Warning Control
Driver door is opened.	Buzzer sounds.
Hood is opened.	The engine changes to 'stalled'.
Shift lever is moved without depressing the clutch pedal.	Buzzer sounds.

Models with CVT
Operation	Warning Control
Driver door is opened while the shift lever is in D or M.	Buzzer sounds.
Hood is opened while the shift lever is in D or M.	The engine changes to 'stalled'.

FUNCTION

Settings of Stop and Start System
1. By press holding the stop and start system cancel switch assembly (warning canceling switch assembly), the idle stop duration can be changed by switching modes between extended mode (with extended idle stop duration) and standard mode (with optimal idle stop duration adjusted in accordance with the air conditioning operation).

CONSTRUCTION

Backup Boost Converter
1. The backup boost converter uses a semiconductor relay. The semiconductor relay also functions as a fuse. When overcurrent is detected, the relay is turned off to protect the circuit.
2. The backup boost converter supplies battery voltage to help make up for the voltage drop that occurs when the engine is restarted. This prevents the operation of the following equipment from being interrupted due to low battery voltage.
  - Power Steering ECU assembly
  - Skid Control ECU
  - Main Body ECU (Multiplex Network Body ECU)
  - Combination Meter Assembly
  - Oil Pump Motor Assembly
  - Radio and Display Receiver Assembly
  - Steering Angle Sensor
  - Tire Pressure Warning ECU and Receiver (Tire Pressure Monitor Receiver Assembly)

OPERATION

Combination Meter Assembly

The combination meter receives the idling on/off signals from the engine stop and start ECU.
Press the ODO/TRIP DISPLAY switch several times to change the multi-information display and display the idle stop time.
- ECO Odometer Display: Total idle stop time since the last time the reset was mode. The reset can be performed by pressing and holding the ODO/TRIP DISPLAY switch. (Total idle stop time is not erased by turning the ignition switch off.)

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

Text in Illustration
*1	Stop and Start Indicator Light	*2	Stop and Start Cancel Indicator Light
*3	Multi-information Display	-	-

Stop and Start Indicator Light Operation (Models with M/T)
Item	Condition	Stop and Start Indicator Light	Buzzer
System Operating (Engine is stopped)	The vehicle is operating normally.	Illuminates	Does not sound
	The shift lever is operated without depressing the clutch pedal.	Blinks*	Sounds
	The driver's door is opened.	Blinks*	Sounds

Stop and Start Indicator Light Operation (Models with CVT)
Item	Condition	Stop and Start Indicator Light	Buzzer
System Operating (Engine is stopped)	The vehicle is operating normally.	Illuminates	Does not sound
System Operating (Engine is stopped)	When the shift lever is in D, the driver's seat belt is unfastened and the driver's door is opened.	Blinks*	Sounds

Tech Tips

*: The blinking interval is 0.15 seconds.

Stop and Start Cancel Indicator Light Operation
Condition	Stop and Start Cancel Indicator Light
The vehicle is stopped and system operation conditions are met.	OFF
While the stop and start system prevents the engine stop control from operating.	Illuminates
When the stop and start system cancel switch assembly (warning canceling switch assembly) is on.	Illuminates
When any Diagnostic Trouble Code (DTCs) are detected.	Blinks*
When the number of times the starter assembly has been operated exceeds the threshold.	Blinks*

Tech Tips

*: The blinking interval is 0.5 seconds.

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 fault. Furthermore, the stop and start cancel indicator light in the combination meter assembly blinks to inform the driver that all CAN communication are normal.
The engine stop and start ECU will also store the Diagnostic Trouble Code (DTC) of the malfunctions. The DTC can be read using the Global TechStream (GTS).