Toyota Yaris: Stop And Start System / System Description

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Engine & Hybrid System / Stop And Start / Stop And Start System / System Description

SYSTEM DESCRIPTION

STOP AND START CONTROL

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.

(a) 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	More than 5 seconds elapsed at ON
	Engine Coolant Temperature	40 to 105°C (104 to 221°F)
	Ambient Temperature	-5°C (23°F) or higher
	Driver Door	3 seconds have elapsed after driver door closed
	Driver Seat Belt	Driver side buckle is latched
	Electronically Controlled Brake System	Normal
	Steering Wheel	When the steerage angle of the steering wheel is 45 degrees or less.
	Steering Speed	Less than 45 deg/s
	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*1	1.1 MPa or higher (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
	Drive Mode	NORMAL or TRUCK mode
	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)
	Engine Speed	1250 rpm or less (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 state and [ON: engine hood close]
	Auxiliary Battery Voltage	When using specified battery: 8.2 V or higher when starter begins operation and 8.2 V or higher when cranking When using non-specified battery: 8.92 V or higher when starter begins operation and 8.92 V or higher when cranking HINT: No three times consecutive short idling stop (less than 5 sec)for low voltage during engine stop
	Auxiliary Battery Fluid Temperature*2	-10°C or higher and 70°C or less (14°F or higher and 158°F or less)
Idle Stop	Auxiliary Battery Integrated Current*3	One of the following conditions is met: -4838 A-sec or more: "Status of Battery Charge Control"4 is Charge Control Coordination Mode, Stop and Start Standalone Mode or Low Temperature Mode -864 A-sec or more: "Status of Battery Charge Control"4 is Stop and Start Restriction Mode or Temperature High/Low Mode
	Auxiliary Battery Charge Control	The value of Data List item Status of Auxiliary 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. Idling stop rate for one trip: 50% or less (Varies according to auxiliary battery fluid temperature). 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, or Engine coolant temperature is higher than 55°C, or Vehicle cabin temperature is higher than the set temperature - 5°C 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".
	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)
	Engine Control	Engine catalytic warm up is completed Engine control learning has completed
	Steering Wheel	When the steerage angle speed of the steering wheel is 45 degrees per second or less.
	Atmospheric pressure	73 kPa (548 mmHg, 21.6 in.Hg) or higher

HINT:

*1: Enough brake force is applied to prevent the vehicle from moving when the engine is started again.
*2: When the auxiliary battery fluid temperature is -15°C (5°F) or less, or 75°C (167°F) or higher, stop and start control is prohibited. When the auxiliary battery fluid temperature returns to -10°C (14°F) or higher, and 70°C (158°F) or less, stop and start control is permitted.
*3: Read the Data List items "Integrated Current" and "Stop&Start Operating Permission (Integrated Current)" when checking the integrated current value.
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*4: Please refer to the Data List "Status of Auxiliary Battery Charge Control" for information about the status of the auxiliary battery charge control.

(b) 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
	Power Steering System	Malfunction in power steering system is detected
	Electronically Controlled Brake System	Malfunction in electronically controlled brake 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: from OFF to ON 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 (11.4 V or less)
	Auxiliary Battery Integrated Current*1	The accumulated value of discharge current during engine stop is too large (- 5184 A-sec or less)
	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 degrees or more
	Accelerator Pedal	Accelerator pedal is depressed
	Stop and Start System Cancel Switch (Combination Switch Assembly)	When stop and start system cancel switch (combination switch assembly) is turned from off to on
	Drive Mode	Except NORMAL and TRUCK mode
	Clutch pedal	Clutch pedal is depressed

HINT:

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

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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 neutral	The engine stops (mode changes to "stalled", and the engine cannot be restarted until the ignition switch is turned off and then to ON)
The shift lever is operated without depressing the clutch pedal	The buzzer sounds and stop and start indicator blinks (engine will not start)
The driver seat belt is unfastened	The engine starts

WARNING INDICATOR AND BUZZER OPERATION

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.

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 ignition switch to ON	Normal operation	Comes on	Comes on	Does not sound
During stop and start control operation (engine is stopped)	Normal operation	Comes on	Does not come on	Does not sound
During stop and start control operation (engine is stopped)	The shift lever is operated without depressing the clutch pedal	Blinks at 0.15 second interval	Does not come on	Sounds
Control is prohibited by the stop and start system cancel switch (combination switch 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	Number of times the starter has been operated exceeds its limit	Does not come on	Blinks at 0.5 second interval	Does not sound

*a	Stop and Start Indicator
*b	Stop and Start Cancel Indicator

MULTI-INFORMATION DISPLAY MESSAGE AND INDICATOR OPERATION

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.
		"Stop & Start system Unavailable"	The engine may have been started with the hood or back door 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.
When the engine cannot be restarted by the stop and start system	-	"Stop & Start System active. Shift to N and Press Clutch to Restart"	The shift lever has been shifted from neutral to another position with the clutch pedal released.
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.

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 malfunction in the stop and start system.

Malfunctioning Area	Malfunction	DTC Output	Data List / Freeze Frame Data	Effect on Vehicle	Area to be Inspected
IGSW circuit	Open	P253014	IG Switch	Stop and start control prohibited Stop and start cancel indicator light blinks	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 control prohibited	Wire harness or connector
TMN (neutral position switch) circuit	Open	P085015	Neutral Switch N Position Switch Signal Voltage	Stop and start control prohibited Stop and start cancel indicator light blinks	Wire harness or connector Neutral position switch
TMN (neutral position switch) circuit	Shorted	P085011 P085015	Neutral Switch N Position Switch Signal Voltage	Stop and start control prohibited Stop and start cancel indicator light blinks	Wire harness or connector Neutral position switch
CLL (clutch switch assembly) circuit	Stuck on	P186262 P083011	Clutch Lower SW N/Clutch Lower Switch Malfunction Clutch Upper SW N/Clutch Upper Switch Malfunction	Stop and start control prohibited Stop and start cancel indicator light blinks	Wire harness or connector Clutch switch assembly
CLL (clutch switch assembly) circuit	Stuck off	-	Clutch Lower SW N/Clutch Lower Switch Malfunction Clutch Upper SW N/Clutch Upper Switch Malfunction	Stop and start control prohibited	Wire harness or connector Clutch switch assembly
BNT1 (engine hood courtesy switch) circuit	Stuck on	-	Hood Courtesy Switch	Mode does not change to "stalled" when engine hood opened with shift lever in D or P and engine stopped by stop and start control	Wire harness or connector Engine hood courtesy switch (hood lock assembly)
BNT1 (engine hood courtesy switch) circuit	Stuck off	-	Hood Courtesy Switch	Stop and start control prohibited despite engine hood being closed
ECAN (stop and start system cancel switch (combination switch assembly)) circuit	Stuck on	-	Stop&Start Cancel Switch	Stop and start control prohibited	Wire harness or connector Stop and start system cancel switch (combination switch assembly)
	Stuck off	-	Stop&Start Cancel Switch	Stop and start control cannot be canceled by pressing the stop and start system cancel switch (combination switch assembly)
BRVC/PB/BRE2 (vacuum sensor) circuit	Open	P055515	Brake Boost Pressure	Stop and start control prohibited Stop and start cancel indicator blinks	Wire harness or connector Vacuum sensor assembly Brake booster assembly Vacuum hose
	Shorted	P055511 P055515
	Remains at intermediate value	P055500 P05552A
STA circuit	Overcurrent	P061519	-	Stop and start control prohibited Stop and start cancel indicator blinks	BBC NO. 1 fuse BBC NO. 2 fuse Wire harness or connector ST NO. 1 relay Engine stop and start ECU
	Stuck on	P164400			Wire harness or connector ST NO. 1 relay Engine stop and start ECU
	Stuck off	P164400
BBC (backup boost converter) circuit	Overcurrent	P323A19	State of BBC	Stop and start 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 Auxiliary battery ECUs and sensors connected to B41, B42, B43, IG41 and OP21
BBC (backup boost converter) circuit	Open Shorted Internal circuit malfunction Auxiliary battery	P30DF62 P30EF4B P323A00 P323A16 P323AA2 P323B29 P323B38	State of BBC	Stop and start 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 Auxiliary battery
ECU inner circuit	Malfunction	P16449E	-	Stop and start control prohibited Stop and start cancel indicator blinks	Engine stop and start ECU
Monitoring CPU circuit	Malfunction	P060629	State of BBC	Stop and start control prohibited Stop and start cancel indicator blinks	Engine stop and start ECU
Crankshaft position sensor circuit	Open	P033562	Engine Speed (ECM) Engine Speed	Stop and start control prohibited	Wire harness or connector Crankshaft position sensor

Effects on Vehicle due to Related System Malfunctions

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	Stop&Start Operating Permission (ECM 1) Stop&Start Operating Permission (ECM 2)	Stop and start control prohibited	SFI system
	Abnormal NE signal	DTCs for SFI system output	-	Stop and start control prohibited Stop and start cancel indicator blinks	SFI system (crankshaft 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 (crankshaft position sensor circuit)
Charging system	Battery state sensor assembly malfunction	Charging system DTCs output	Auxiliary battery Fluid Temperature Integrated Current	Stop and start control prohibited	Charging system
Electronically controlled brake system	ABS running	-	ABS Running	Stop and start control prohibited	-
Electronically controlled brake system	Malfunction in wheel speed sensor	Brake control system DTCs output	Vehicle Speed 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 power steering system	EPS assist current value invalid	EPS Load EPS Assist Current Available	Stop and start control prohibited	Power steering ECU Torque sensor
Seat belt warning system	Malfunction in seat belt warning system	-	Driver Seat Belt Buckle Switch	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 driver door courtesy light switch circuit	-	Driver 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 indicator blinks Sounds the warning buzzer	Front door courtesy light switch assembly LH Driver door courtesy light switch circuit
Air conditioning system	Malfunction in ambient temperature sensor	Air conditioning system DTCs output	Ambient Temperature	Stop and start control prohibited	Ambient temperature sensor circuit
Brake vacuum	Brake booster vacuum drops	-	Brake Boost Pressure Brake Negative Pressure	Stop and start control prohibited	Brake booster assembly vacuum Brake booster assembly Vacuum sensor assembly Vacuum hose
Power source	Backup boost converter malfunction	P30DF62 P30EF4B P323A00 P323A16 P323AA2 P323B29 P323B38	State of BBC	Stop and start 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 Auxiliary battery
	Charging system malfunction	-	Alternator Status	Stop and start control prohibited	Charging system
	Charging control system	P160F00	-	Stop and start control prohibited Stop and start cancel indicator blinks	Charging system
Number of starter operations	Exceeds the specified limit	P154563	Starter Operation # Number of Engine Starts (IG-ON) Number of Engine Starts (Stop & Start)	Stop and start control prohibited Stop and start cancel indicator blinks	Starter assembly replacement is required ST NO. 1 relay replacement is required Fuse replacement is required
Starter signal malfunction	Signal does not match with the starter switch	P061562	Starter Engine Starter Signal	Stop and start control prohibited Stop and start cancel indicator blinks	Wire harness or connector Engine stop and start ECU
Jump start	Engine started with the engine hood or back door open	-	Stop&Start Operating Prohibition (Jump Start)	Stop and start control prohibited (permitted when the ignition switch is turned off)	Check for history of roadside service or jump start due to dead auxiliary battery Engine hood courtesy switch (hood lock assembly) Back door lock assembly with courtesy light switch
CAN communication	Communication interrupted	U010087 U010187 U012687 U012987 U013187 U014087 U015187 U015587 U016487 U111087 U117087	-	Stop and start control prohibited Stop and start cancel indicator blinks	Applicable wire harness or connector Applicable ECU

System Diagram

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Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Supply Voltage Circuit Circuit Voltage Out of Range (C123A1C)

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Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Components

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Toyota Yaris: Stop And Start System / System Description

System Diagram

How To Proceed With Troubleshooting

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Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Components

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