Toyota Yaris: Stop And Start System / System Description

Toyota Yaris XP210 (2020-2022) 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.

    Click here

  • *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

Click here

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

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

Shorted

  • P085011
  • P085015
  • Neutral Switch
  • N Position Switch Signal Voltage
  • Stop and start control prohibited
  • Stop and start cancel indicator light blinks

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

Stuck off

-

  • Clutch Lower SW
  • N/Clutch Lower Switch Malfunction
  • Clutch Upper SW
  • N/Clutch Upper Switch Malfunction

Stop and start control prohibited

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)

Stuck off

-

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 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
  • 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

-

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

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