STOP AND START SYSTEM 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.

When all of the conditions in the following table have been met, the engine is stopped by stop and start control.

Table 1. for 1AD-FTV, 1ND-TV
Item		Condition (All of the following conditions are met)
Idle Stop	Ignition Switch	5 seconds or more have passed with the ignition switch ON
	Engine Coolant Temperature	Within the specified temperature range (varies depending on the vehicle usage environment) Tip: The upper limit is 105°C (221°F) The lower limit is maximum 65 °C (149 °F)
	Atmospheric Pressure	75 kPa (0.8 kgf/cm², 11 psi) or higher
	Ambient Temperature	Higher than -6°C (21.2 °F)
	Driver Door	Closed
	Driver Seat Belt	Fastened
	Brake Booster Vacuum	Sufficient
	Shift Position	Shift lever in neutral
	Stop and Start System Cancel Switch	Off (system control is not prohibited)
	Vehicle Speed	0 km/h (0 mph) (After the engine warms up)
	Engine Speed	1250 rpm or less
	Engine Hood	Closed
	Battery Voltage	6.6 V or higher at engine start1 6.5 V or higher at engine start2
	Battery Temperature*3	-10 to 70°C (14 to 158°F)
	Battery Integrated Current*4	0 A-sec or higher: After engine start by ignition switch operation The integrated current value has increased to 0 A-sec or higher at least once after ignition switch ON: Tip: The engine is stopped until the following conditions are not met: -4838 A-sec or higher: The battery charge is sufficient and the battery temperature is -1°C (30.2°F) or higher and below 70°C (158°F)2 -6451 A-sec or higher: The battery charge is sufficient and the battery temperature is -1°C (30.2°F) or higher and below 70°C (158°F)1 -864 A-sec or higher: The battery charge is insufficient and the battery temperature is below -1°C (30.2°F) or 70°C (158°F) or higher2 -1152 A-sec or higher: The battery charge is insufficient and the battery temperature is below -1°C (30.2°F) or 70°C (158°F) or higher1
	Air Conditioning	Other than when stop and start control is prohibited
	Heater	One of the following conditions is met: The blower switch is off The blower switch is on when the ambient temperature is 11°C (51.8°F) or higher or the engine coolant temperature is 46°C (114.8°F) or higher 0 to 20 seconds after the engine is restarted by stop and start control, and the air conditioning switch is off, or the blower switch is off.

Table 2. for 1NR-FE
Item		Condition (All of the following conditions are met)
Idle Stop	Ignition Switch	5 seconds or more have passed with the ignition switch ON
	Engine Coolant Temperature	40°C to 105°C (104°F to 221°F)
	Ambient Temperature	Higher than -6°C (21.2 °F)
	Driver Door	Closed
	Driver Seat Belt	Fastened
	Brake Booster Vacuum	Sufficient
	Shift Position	Shift lever in neutral
	Stop and Start System Cancel Switch	Off (system control is not prohibited)
	Vehicle Speed	0 km/h (0 mph) (After the engine warms up)
	Engine Speed	1250 rpm or less
	Hood	Closed
	Battery Voltage	7.2 V or higher at engine start
	Battery Temperature*3	-10 to 70°C (14 to 158°F)
	Battery Integrated Current*4	0 A-sec or higher: After engine start by ignition switch operation The integrated current value has increased to 0 A-sec or higher at least once after ignition switch ON: Tip: The engine is stopped until the following conditions are not met: -4838 A-sec or higher: The battery charge is sufficient and the battery temperature is -1°C (30.2°F) or higher and below 70°C (158°F) -864 A-sec or higher: The battery charge is insufficient or the battery temperature is below -1°C (30.2°F) or 70°C (158°F) or higher
	Air Conditioning	Other than when stop and start control is prohibited
	Heater	One of the following conditions is met: The blower switch is off The blower switch is on when the ambient temperature is 11°C (51.8°F) or higher or the engine coolant temperature is 46°C (114.8°F) or higher 0 to 20 seconds after the engine is restarted by stop and start control, and the air conditioning switch is off, or the blower switch is off.

Tip:

*1: for 1AD-FTV
*2: for 1ND-TV
*3: When the battery temperature is -15°C (5°F) or lower, or 75°C (167°F) or higher, the stop and start control is prohibited. When the battery temperature returns to -10°C (14°F) or higher, or 70°C (158°F) or lower, stop and start control is permitted.
*4: Read the Data List item "Integrated Current" or "Oper Permission (Integrated Current)" when checking the integrated current value
Click here

When the engine is stopped by stop and start control, and any of the following conditions are met, the engine will restart.

Table 3. for 1AD-FTV, 1ND-TV
Item		Condition (Any of the following conditions are met)
Engine Restart	Brake Booster Vacuum	The brake booster vacuum is insufficient
	Air Conditioning	The timer in the air conditioning amplifier assembly runs out
	Heater	When the blower is in auto mode, the timer in the air conditioning amplifier assembly runs out. In other conditions, the timer in the engine stop and start ECU runs out
	Air Conditioning/Heater	A/C switch, blower switch: ON Defogger switch: ON The blower switch is turned off during auto control or the blower mode is changed to manual Pollen mode switch: ON
	Battery	Battery performance or voltage drops
	Vehicle Speed	Vehicle speed signal is input
	Driver Door	Open
	Driver Seat Belt	Driver seat belt is unfastened
	Stop and Start System Cancel Switch	Stop and start system cancel switch (ecorun cancel switch assembly) is turned from off to on
	Heater Switch Assembly*	The heater switch assembly is turned on

Table 4. for 1NR-FE
Item		Condition (Any of the following conditions is met)
Engine Restart	Brake Booster Vacuum	The brake booster vacuum is insufficient
	Air Conditioning	The timer in the air conditioning amplifier assembly runs out
	Heater	When the blower is in auto mode, the timer in the air conditioning amplifier assembly runs out. In other conditions, the timer in the engine stop and start ECU runs out
	Air Conditioning/Heater	A/C switch, blower switch: ON Defogger switch: ON The blower switch is turned off during auto control or the blower mode is changed to manual Pollen mode switch: ON
	Battery	Battery performance or voltage drops
	Vehicle Speed	Vehicle speed signal is input
	Driver Door	Open
	Driver Seat Belt	Driver seat belt is unfastened
	Stop and Start System Cancel Switch	Stop and start system cancel switch (ecorun cancel switch assembly) is turned from off to on

*: w/ Combustion Type Power Heater System

SYSTEM PROHIBITION CONTROL

The engine stop and start ECU prohibits stop and start control by the stop and start system according to the table below. The prohibition conditions are specified for each system.

Table 5. for 1AD-FTV, 1ND-TV
System	Prohibition Condition	Vehicle State	Restoration Condition	Prohibition Condition Check Timing
Engine	Not within the specified temperature range (varies depending on the vehicle usage environment) Tip: The upper limit is 105°C (221°F) The lower limit is maximum 65 °C (149 °F)	Engine has not warmed up	Within the specified temperature range (varies depending on the vehicle usage environment)	Always
	Atmospheric pressure 75 kPa (0.8 kgf/cm², 11 psi) or less	-	Atmospheric pressure 75 kPa (0.8 kgf/cm², 11 psi) or higher	Always
	DPF warning light on (Excessive PM accumulation)	-	DPF warning light off (PM regeneration complete)	Always
	During PM regeneration*2	-	PM regeneration complete	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
Air Conditioning	Heater: All of the following conditions are met: Blower switch is on Ambient temperature is 10°C (50°F) or lower Coolant temperature is lower than 45°C (113°F)	Heater performance decreases	Coolant temperature is 45°C (113°F) or higher Blower switch is off	While the heater is on
	Heater switch is on (for Combustion Type Power Heater System)	-	Heater switch is off (for Combustion Type Power Heater System)	While the heater is on
	Cooling function: All of the following conditions are met: Blower switch is on Air conditioning switch is on Ambient temperature is 25°C (77°F) or higher Evaporator temperature is 9°C (48.2°F) or higher	Cooling performance decreases	Any of the following conditions have been met: Evaporator temperature is 9°C (48.2°F) or lower Blower switch is off Air conditioning switch is off	While the air conditioning system (cooling function) is on
	Defogger: All of the following conditions have been met: Blower switch is on 0 to 20 seconds after the engine is restarted by stop and start control when the ambient temperature is -7°C (19.4°F) or higher and the blower switch and air conditioning switch are on	Fogging of windows Air conditioning performance decreases Odor from air vents	Blower switch is off 0 to 20 seconds have passed after restarting the engine by the stop and start control or the air conditioning switch is off, or blower switch is off.	While the air conditioning system (cooling function for defogger) is on
Driver Door	Driver door is opened before engine stop by engine stop and start control	Driver door courtesy switch ON signal is input	Driver door is closed	Always
Engine Hood	Engine hood is opened before engine stop by stop and start control	Engine hood switch OFF signal is input	Engine hood is closed	Always
Seat Belt	Driver seat belt is not fastened before engine stop by engine stop and start control	Driver seat belt buckle switch OFF signal is input	Driver seat belt is fastened	Always
Ambient Temperature	Ambient temperature -6°C (21.2°F) or lower	-	Ambient temperature -5°C (23°F) or higher	Always
Power Source*1	Battery voltage drops below 6.6 V at engine start	Battery charge is insufficient or battery has deteriorated	Battery is charged or replaced	Every time the engine is started
	Battery temperature is -15°C (5°F) or lower or 75°C (167°F) or higher (At low temperatures: Engine restarting is not assured At high temperatures: For battery protection)	Depends on Ambient temperature	An appropriate battery temperature is reached	Always
	Battery integrated current*3 value is: Less than 0 A-sec: After engine start by ignition switch operation Either of the following integrated current conditions is met: -6451 A-sec or less: The battery charge is sufficient and the battery temperature is -1°C (30.2°F) or higher and below 70°C (158°F) -1152 A-sec or less: The battery charge is insufficient and the battery temperature is below -1°C (30.2°F) or 70°C (158°F) or higher	Heavy electrical load High stop and start rate (Time that engine stopped by stop and start control is long)	Battery integrated current*3 value is more than a certain level. 0 A-sec or higher: After engine start by ignition switch operation Either of the following integrated current conditions is met: -5299 A-sec or higher: The battery charge is sufficient and the battery temperature is -1°C (30.2°F) or higher and below 70°C (158°F) 0 A-sec or higher: The battery charge is insufficient and the battery temperature is below -1°C (30.2°F) or 70°C (158°F) or higher	Always
	During refresh charge	A refresh charge of 30 minutes or more is performed after every 20 hours of driving	Refresh charge is completed	Always
	Idling stop rate 40% or higher	-	Idling stop rate 24% or less	Always
	Engine is started with the engine hood open (for jump starting)	-	Ignition switch is turned off	Every time the engine is started
Power Source*2	Battery voltage drops below 6.5 V at engine start	Battery charge is insufficient or battery has deteriorated	Battery is charged or replaced	Every time the engine is started
	Battery temperature is -15°C (5°F) or lower or 75°C (167°F) or higher (At low temperatures: Engine restarting is not assured At high temperatures: For battery protection)	Depends on Ambient temperature	An appropriate battery temperature is reached	Always
	Battery integrated current*3 value is: Less than 0 A-sec: After engine start by ignition switch operation Either of the following integrated current conditions is met: -4838 A-sec or less: The battery charge is sufficient and the battery temperature is -1°C (30.2°F) or higher and below 70°C (158°F) -864 A-sec or less: The battery charge is insufficient and the battery temperature is below -1°C (30.2°F) or 70°C (158°F) or higher	Heavy electrical load High stop and start rate (Time that engine stopped by stop and start control is long)	Battery integrated current*3 value is more than a certain level. 0 A-sec or higher: After engine start by ignition switch operation Either of the following integrated current conditions is met: -3974 A-sec or higher: The battery charge is sufficient and the battery temperature is -1°C (30.2°F) or higher and below 70°C (158°F) 0 A-sec or higher: The battery charge is insufficient and the battery temperature is below -1°C (30.2°F) or 70°C (158°F) or higher	Always
	During refresh charge	A refresh charge of 30 minutes or more is performed after every 20 hours of driving	Refresh charge is completed	Always
	Idling stop rate 40% or higher	-	Idling stop rate 24% or less	Always
	Engine is started with the engine hood open (for jump starting)	-	Ignition switch is turned off	Every time the engine is started

Table 6. for 1NR-FE
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 control is 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
Air Conditioning	Heater: All of the following conditions are met: Blower switch is on Ambient temperature is 10°C (50°F) or lower Coolant temperature is lower than 45°C (113°F)	Heater performance decreases	Coolant temperature is 45°C (113°F) or higher Blower switch is off	While the heater is on
	Cooling function: All of the following conditions are met: Blower switch is on Air conditioning switch is on Ambient temperature is 25°C (77°F) or higher Evaporator temperature is 9°C (48.2°F) or higher	Cooling performance decreases	Any of the following conditions have been met: Evaporator temperature is 9°C (48.2°F) or lower Blower switch is off Air conditioning switch is off	While the air conditioning system (cooling function) is on
	Defogger: All of the following conditions have been met: Blower switch is on 0 to 20 seconds after the engine is restarted by stop and start control when the ambient temperature is -7°C (19.4°F) or higher and the blower switch and air conditioning switch are on	Fogging of windows Air conditioning performance decreases Odor from air vents	Blower switch is off 0 to 20 seconds have passed after restarting the engine by the stop and start control or the air conditioning switch is off, or blower switch is off.	While the air conditioning system (cooling function for defogger) is on
Driver Door	Driver door is opened before engine stop by engine stop and start control	Driver door courtesy switch ON signal is input	Driver door is closed	Always
Engine Hood	Engine hood is opened before engine stop by stop and start control	Engine hood switch OFF signal is input	Engine hood is closed	Always
Seat Belt	Driver seat belt is not fastened before engine stop by engine stop and start control	Driver seat belt buckle switch OFF signal is input	Driver seat belt is fastened	Always
Ambient Temperature	Ambient temperature -6°C (21.2°F) or lower	-	Ambient temperature -5°C (23°F) or higher	Always
Power Source	Battery voltage drops below 7.2 V at engine start	Battery charge is insufficient or battery has deteriorated	Battery is charged or replaced	Every time the engine is started
	Battery temperature is -15°C (5°F) or lower or 75°C (167°F) or higher (At low temperatures: Engine restarting is not assured At high temperatures: For battery protection)	Depends on Ambient temperature	An appropriate battery temperature is reached	Always
	Battery integrated current*3 value is: Less than 0 A-sec: After engine start by ignition switch operation Either of the following integrated current conditions is met: -4838 A-sec or less: The battery charge is sufficient and the battery temperature is -1°C (30.2°F) or higher and below 70°C (158°F) -864 A-sec or less: The battery charge is insufficient and the battery temperature is below -1°C (30.2°F) or 70°C (158°F) or higher	Heavy electrical load High stop and start rate (Time that engine stopped by stop and start control is long)	Battery integrated current*3 value is more than a certain level. 0 A-sec or higher: After engine start by ignition switch operation Either of the following integrated current conditions is met: -3974 A-sec or higher: The battery charge is sufficient and the battery temperature is -1°C (30.2°F) or higher and below 70°C (158°F) 0 A-sec or higher: The battery charge is insufficient and the battery temperature is below -1°C (30.2°F) or 70°C (158°F) or higher	Always
	During refresh charge	A refresh charge of 30 minutes or more is performed after every 20 hours of driving	Refresh charge is completed	Always
	Idling stop rate 40% or higher	-	Idling stop rate 24% or less	Always
	Engine is started with the engine hood open (for jump starting)	-	Ignition switch is turned off	Every time the engine is started

Tip:

*1: for 1AD-FTV
*2: for 1ND-TV
*3: Read the Data List item "Integrated Current" or "Oper Permission (Integrated Current)" when checking the integrated current value
When the cable is disconnected from the negative (-) battery terminal, stop and start control is prohibited for a certain amount of time. After connecting the cable, drive the vehicle until stop and start control is permitted (approximately 15 to 40 minutes).
Allow the engine to idle for 3 minutes after the engine warms up and check that the engine 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 driver door is opened while the shift lever is in neutral	The engine starts
The driver seat belt is unfastened	The engine starts
The engine hood opened	The engine changes to "stalled"
The shift lever is operated without depressing the clutch pedal	The buzzer sounds and stop and start indicator light blinks (engine will not start)

WARNING INDICATOR AND BUZZER OPERATION

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

Table 7. Stop and Start Indicator and Buzzer Operation
Item	Condition	Stop and start indicator light (Green)	Stop and start cancel indicator light (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	The blinking interval is 0.15 seconds.	Does not come on	Sounds
Control is prohibited by the stop and start cancel switch	Normal operation	Does not come on	Comes on	Does not sound
Diagnostic trouble code	Any DTCs are stored	Does not come on	The blinking interval is 0.5 seconds.	Does not sound
Starter life	The number of times the starter has been operated exceeds its limit	Does not come on	The blinking interval is 0.5 seconds.	Does not sound

*a	Stop and Start Indicator Light (Green)
*b	Stop and Start Cancel Indicator Light (Orange)

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
IGSW circuit	Open	P2531	IG Switch IG SW Abnoml	Stop and start control prohibited	Wire harness or connector
+B circuit	Open	-	Data List cannot be checked because power is not supplied to the engine stop and start ECU	Stop and start control prohibited	Wire harness or connector
TMN (neutral position switch) circuit	Stuck on	P1780	Neutral Switch N position Switch N Position Voltage Status	Stop and start control prohibited Stop and start cancel indicator light blinks	Wire harness or connector Neutral position switch
TMN (neutral position switch) circuit	Stuck off	P1780	Neutral Switch N position Switch N Position Voltage Status	Stop and start control prohibited Stop and start cancel indicator light blinks	Wire harness or connector Neutral position switch
CLL (clutch start switch assembly (for lower)) circuit	Stuck on	P1862	Clutch Lower SW Clutch SW Signal Abnoml N/Clutch Lower SW Abnoml	Stop and start control prohibited Stop and start cancel indicator light blinks	Wire harness or connector Clutch start switch assembly (for lower) Clutch start switch assembly (for upper)
CLL (clutch start switch assembly (for lower)) circuit	Stuck off	-	Clutch Lower SW N/Clutch Lower SW Abnoml	Stop and start control prohibited
CLU (clutch start switch assembly (for upper)) circuit	Stuck on	P1862	Clutch Upper SW Clutch SW Signal Abnoml N/Clutch Upper SW Abnoml	Stop and start control prohibited Stop and start cancel indicator light blinks
CLU (clutch start switch assembly (for upper)) circuit	Stuck off	-	Clutch Upper SW N/Clutch Upper SW Abnoml	Stop and start control prohibited
BNT1 (hood lock switch) circuit	Stuck on	-	Hood Courtesy Switch	The engine does not stall when the engine hood is opened with the shift lever in neutral while the engine is stopped by stop and start control	Wire harness or connector Hood lock switch assembly
BNT1 (hood lock switch) circuit	Stuck off	-	Hood Courtesy Switch	Stop and start control prohibited despite the engine hood being closed	Wire harness or connector Hood lock switch assembly
BRVC/PB/BRE2 (vacuum sensor) circuit	Open	P1540	Brk Boost Sen Abnoml 1 Brk Boost Sen Abnoml 2 Brk Boost Sen Abnoml 3	Stop and start control prohibited Stop and start cancel indicator light blinks	Wire harness or connector Vacuum sensor assembly Brake booster assembly Check valve to connector tube hose
	Shorted	P1540
	Remains at intermediate value	P1541
ECAN (stop and start cancel switch) circuit	Stuck on	-	Cancel Switch	Stop and start control prohibited	Wire harness or connector Stop and start system cancel switch (ecorun cancel switch assembly)
ECAN (stop and start cancel switch) circuit	Stuck off	-	Cancel Switch	Stop and start control cannot be canceled by pressing the stop and start system cancel switch (ecorun cancel switch assembly)
STA circuit	Over-current	P0617	Starter Relay Overcurrent Starter Circuit Abnoml Starter Circuit Open	Stop and start control prohibited Stop and start cancel indicator light blinks	BBC fuse Wire harness or connector ST NO.1 relay Engine stop and start ECU
	Stuck on	P1644			Wire harness or connector ST NO.1 relay Engine stop and start ECU
	Stuck off	P1644
BBC (backup boost converter) circuit	Over-current	B22C0	State of BBC BBC Abnoml BBC Overcurrent BBC Check Result	Stop and start control prohibited Stop and start cancel indicator light blinks	BBC fuse Wire harness or connector Engine stop and start ECU Battery ECUs and sensors connected to BO1 and IGO1
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	Stop and start control prohibited Stop and start cancel indicator light blinks	BBC fuse Wire harness or connector Engine stop and start ECU Battery
VB- circuit	Open	P0560	VB Voltage Low	Stop and start control prohibited Stop and start cancel indicator light blinks	Wire harness or connector Engine stop and start ECU
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
EEPROM	Malfunction	P062F	EEPROM	Stop and start control prohibited Stop and start cancel indicator light blinks	Engine stop and start ECU
Sensor power source circuit	Malfunction	P0641	State of BBC	Stop and start control prohibited Stop and start cancel indicator light blinks	Engine stop and start ECU

Table 8. 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
ECD or SFI system	MIL illuminated	DTCs for ECD or SFI system output	Oper Permission (ECM)	Stop and start control prohibited	ECD or SFI system
	Abnormal NE signal	P0335	NE Sensor Circuit Open 2 Crank Pos Sen Abnoml 3	Stop and start control prohibited Stop and start cancel indicator light blinks	ECD or SFI system (crank position sensor circuit) Wire harness or connector
	Crankshaft reverse rotation detection	P0336	-	Stop and start control prohibited MIL illuminated	SFI system (crank position sensor circuit)
	Battery current sensor (generator control ECU assembly) malfunction	P0516 P0517 P1550 P1551 P1552	Battery Fluid Temperature Integrated Current	Stop and start control prohibited	Charging system
Brake control system	Brake control system	-	ABS Running	Stop and start control prohibited	-
Brake control system	Malfunction in wheel speed sensor	Brake control system DTCs output	Vehicle Sped 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 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 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 (Driver side) Wire harness or connector
Driver door courtesy light switch circuit	Malfunction in driver door courtesy light switch circuit	-	D Courtesy Switch	Stop and start control prohibited (stuck off) Engine does not restart when it is stopped by stop and start control (stuck on)	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 temp 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 Abnoml BBC Over Heat BBC Power Low	Stop and start control prohibited Stop and start cancel indicator light blinks	BBC 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 light 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 light 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	P1545	-	Stop and start control prohibited Stop and start cancel indicator light blinks	Wire harness or connector Engine stop and start ECU
Jump start	Engine started with the engine hood open	-	Eng Start Reg (Engine Hood Open)	Stop and start control prohibited (permitted when the ignition switch is turned off)	Check for a history of roadside service or jump start due to dead battery Engine hood courtesy switch (hood lock assembly)
CAN communication	Communication interrupted	U0100 U0121 U0131 U0140 U0151 U0155* U0164 U1110	-	Stop and start control prohibited Stop and start cancel indicator light blinks*	Applicable wire harness or connector Applicable ECU

Tip:

*: The stop and start cancel indicator light does not blink when a communication error with the combination meter assembly occurs.