System Description [11/2022 - 11/2023]

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 control.

   Item		Condition (All of the following conditions are met)
   Idle Stop	Push Start Switch Assembly*1	More than 5 seconds elapsed at ON
   	Ignition or Starter Switch Assembly*2
   	Engine Coolant Temperature	40 to 100°C (104 to 212°F)
   	Driver Door	3 seconds have elapsed after driver door closed
   	Driver Seat Belt	Driver side buckle is latched
   	Electronically Controlled Brake System	Normal
   	Brake Booster Vacuum	On a flat place, more than 1 second elapses at more than 42.5 kPa (Threshold values change according to road surface gradient and brake master pressure.)
   	Brake Master Cylinder Fluid Pressure*3	More than 1.1 MPa (11.2 kg/cm2 , 160 psi) (changes according to gradient)
   	Shift Position	After shift lever is operated and 1 second elapses, shift lever is in D or P
   	CVT Fluid Temperature	25 to 110°C (77 to 230°F) Other than when stop and start control is prohibited due to insufficient CVT fluid pressure, etc.
   	Stop and Start System Cancel Switch (Combination Switch Assembly)	OFF
   	Vehicle Speed	0 km/h (0 mph) (After the engine has warmed up and is running)
   	Road Grade	Road Surface Gradient: Road Surface gradient condition is permitted (road surface gradient is within -1.02 m/s2 to 1.36 m/s2 ) Deceleration sensor calibration: Complete Deceleration sensor offset value: In - 1.02 m/s2 to 1.36 m/s2 Deceleration sensor movement: Deceleration sensor output is not stuck
   	Engine Speed	Less than 1250 rpm (changes according to engine coolant temperature)
   	Hood	3 seconds have elapsed after engine hood closed (However, permitted when engine started after more than 30 seconds elapsed with ignition switch off and engine hood closed)
   	Auxiliary Battery Voltage	When using specified auxiliary battery:  8.6 V or higher when starter begins operation and 8.6 V or higher when cranking When using non-specified auxiliary battery:  8.92 V or higher when starter begins operation and 8.92 V or higher when cranking
   	Auxiliary Battery Fluid Temperature*4	-10°C or higher and 60°C or less (14°F or higher and 140°F or less) Inlet air temperature sensor is normal
   Idle Stop	Auxiliary Battery Integrated Current*5	One of the following conditions is met:  -15444 A-sec or higher: "Status of Battery Charge Control"*6 is Charge Control Coordination Mode, Stop and Start Standalone Mode, Temperature High/Low Mode or Low Temperature Mode 0 A-sec or higher: "Status of Battery Charge Control"*6 is Stop and Start Restriction Mode
   	Auxiliary Battery Charge Control	The value of Data List item Status of Battery Charge Control is not Refresh Charge Mode, Abnormal Mode or Battery Condition Judgment Mode.
   	Idling Stop Rate / Total Idling Stop Rate	Idling stop rate for one trip: 50% or less. Total idling stop rate: Less than 40% HINT:  Idling stop rate: Idling stop rate for ignition on time (1 trip) Total idling stop rate: Idling stop rate for total ignition on time
   	Air Conditioning	Any of the following conditions are met:  Defogger Switch: OFF, and Blower Switch: OFF With blower switch on, evaporator temperature below threshold (varies depending on each temperature, humidity, amount of solar radiation, etc.) and after certain period of time since engine restarted by stop and start system (threshold varies depending on idling stop conditions)
   	Heater	One of the following conditions is met:  Blower switch is off While blower switch is on and A/C switch is off, one of the following conditions is met: Ambient temperature is higher than 10°C (50°F), or Engine coolant temperature is higher than 55°C (131°F) Vehicle cabin temperature is higher than the set temperature - 5°C (-23°F) While blower switch is on and A/C switch is off, a certain amount of time has elapsed after engine state changed from "not running" to "running". Malfunction in Air Conditioning System is detected
   	Cooler	One of the following conditions is met:  Blower switch is off A/C switch is off Ambient temperature 23°C (73°F) or less Evaporator internal temperature less than 9°C (48°F), air mix damper opening value more than 10%, and vehicle cabin temperature less than 3°C (37°F) above set temperature or blower level less than 16 (when ignition switch turned to ON for first time in one trip) Malfunction in Air Conditioning System is detected
   	Engine Control	Engine catalytic warm up is completed Engine control learning has completed Refer to INITIALIZATION [09/2021 - 11/2023] CVT control learning has completed for 2WD: Refer to INITIALIZATION [11/2022 - 11/2023] for AWD: Refer to INITIALIZATION [11/2022 - 11/2023]
   	Dynamic Radar Cruise Control System	When the dynamic radar cruise control is operating and the brake hold function is operating

   1. *1: w/ Smart Key System
   2. *2: w/o Smart Key System

   HINT: 

   • *3: Enough brake force is applied to prevent the vehicle from moving when the engine is started again.
   • *4: When the auxiliary battery fluid temperature is -15°C (59°F) or less, or 65°C (149°F) or higher, stop and start control is prohibited. When the auxiliary battery fluid temperature returns to -10°C (14°F) or higher, and 60°C (140°F) or less, stop and start control is permitted.
   • *5: Read the Data List items "Integrated Current" and "Stop&Start Operating Permission (Integrated Current)" when checking the integrated current value.

     Refer to DATA LIST / ACTIVE TEST [11/2022 - 11/2023]

   • *6: Please refer to the Data List "Status of Battery Charge Control" for information about the status of the auxiliary battery charge control.
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 is met)
   Engine Restart	Brake Booster Vacuum	Brake booster vacuum insufficient (Under 37.5 kPa (0.38 kg/cm2 , 5.4 psi)) (Brake booster vacuum changes in accordance with brake fluid pressure (brake pedal effort))
   	SFI System	Malfunction in SFI system is detected
   	CVT Fluid Temperature	Temperature is less than 25 (77°F) or more than 110°C (230°F)
   	Electronically Controlled Brake System	Malfunction in electronically controlled brake system is detected
   	Electromagnetic Oil Pump	Electromagnetic oil pump malfunctioning
   	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: from OFF to ON Defogger switch: from OFF to ON During blower OFF and Auto control, when it changed to manual blower Changes from stop and start system priority control to normal system control
   	Auxiliary Battery	Auxiliary battery voltage drops (11.8 V or less)
   	Auxiliary Battery Integrated Current*1	The accumulated value of discharge current during engine stop is too large (2376 A-sec or more) Any of the following conditions are met: -5444 A-sec or less: "Status of Battery Charge Control"*2 is Charge Control Coordination Mode, Stop and Start Standalone Mode or Low Temperature Mode -990 A-sec or less: "Status of Battery Charge Control"*2 is Stop and Start Restriction Mode or Temperature High/Low Mode Battery state sensor current is abnormal LIN communication malfunction
   	Auxiliary Battery Fluid Temperature	-15°C or less, or 65°C or higher (59°F or less, or 149°F or higher) Inlet air temperature sensor is abnormal
   	Vehicle Speed	Vehicle speed signal is input (Vehicle stopped on a slope, etc.)
   	Driver Door	Open
   	Driver Seat Belt	Driver seat belt is unfastened
   	Brake Pedal	Brake pedal released (brake fluid pressure decreases)
   	Accelerator Pedal	Accelerator pedal is depressed
   	Shift Position	Shift lever moved from D or P to other position
   	Stop and Start System Cancel Switch (Combination Switch Assembly)	On (When stop and start system cancel switch is turned from off to on)
   	Dynamic Radar Cruise Control System	Vehicle stops during dynamic radar cruise control is operating, and after the precedent vehicle move or driver do resume operation (operation to move)

   HINT: 

   • *1: Read the Data List items "Integrated Current" and "Stop&Start Operating Permission (Integrated Current)" when checking the integrated current value

     Refer to DATA LIST / ACTIVE TEST [11/2022 - 11/2023]

   • *2: Please refer to the Data List "Status of Battery Charge Control" for information about the status of the auxiliary battery charge control.

If any of the following operations are performed while the engine is stopped due to stop and start control, the driver will be warned by the indicator, the warning buzzer or engine status switching. When the engine status switched from "stopped due to system control" to "stalled", the stop and start system cannot restart the engine.

1. *1: When the shift lever is in P, the warning buzzer does not sound and the stop and start indicator does not blink.

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.

HINT: 

The stop and start indicator and the stop and start cancel indicator are displayed at the same location in the combination meter.

One or the other will be displayed according to the order of priority, but they will not be illuminated simultaneously.

Fig 1: Stop and Start Indicator

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. *1: Shift lever in D

An indicator and/or messages are displayed on the multi-information display to indicate the condition of the stop and start system when certain vehicle conditions are met.

Stop and Start System Condition	Multi-information Display Message*1		Vehicle Condition
When the engine cannot be stopped by the stop and start system	*2	"Press Brake More to Activate"	The brake pedal is not depressed enough.
		"Non-Dedicated Battery"	A non-specified auxiliary battery for the stop and start system may have been installed.
		"Battery Charging"	The auxiliary battery charge amount may be low. A refresh charge may be occurring. The auxiliary battery voltage may be low. The auxiliary battery temperature may be high.
		"Stop & Start Unavailable"	The engine may have been started with the hood opened. The stop and start system is temporarily disabled.
		"In Preparation"	The brake booster load decreased. The vehicle is operated at a high elevation.
		"For Climate Control"	The air conditioning system is being used when the ambient temperature is high or low. Windshield defogger is pressed.
When the engine automatically restarts while stopped by the stop and start system	*2	"In Preparation"	The brake pedal is strongly depressed further or pumped.
		"For Climate Control"	The air conditioning system is turned on or the air conditioning is being used. Windshield defogger is turned on.
		"Battery Charging"	The auxiliary battery charge amount may be low.
The system may be malfunctioning	-	"Stop & Start System Malfunction Visit Your Dealer"	-

HINT: 

• *1: Messages are listed in the order of priority.
• *2: When the engine cannot be stopped by the stop and start system or the engine is restarted while the engine is stopped by the stop and start system, the following mark is displayed on the multi-information display.

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.