Engine TOYOTA YARIS 2012 Owners Manual

322 2-4. Using other driving systems
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The Stop & Start system protection feature
Vehicles without a smart entry & start system:
When an excessively loud sound is being projected by the audio system, the
audio system may be automatically cut off in order to maintain power for the
Stop & Start system function.
If this occurs, turning the engine switch to the “LOCK” position then to the
“ACC” or “ON” position re-enables the audio system.
Vehicles with a smart entry & start system:
When an excessively loud sound is being projected by the audio system, the
audio system may be automatically cut off in order to maintain power for the
Stop & Start system function.
If this occurs, turning the “ENGINE START STOP” switch off then to ACCES-
SORY mode or IGNITION ON mode re-enables the audio system.
Steering wheel operation
When the engine is stopped by the Stop & Start system, the steering wheel
may become heavier than when driving.
Hood
If the hood is opened while the engine is stopped by the Stop & Start system,
the engine cannot be restarted by the Stop & Start system or by the auto-
matic engine start function. Restart the engine with the engine switch opera-
tion. (P. 224, 228)
Vehicles with a Multidrive: If the hood is opened while the engine is stopped
by the Stop & Start system and the shift lever is in N or P, the engine will
restart.
Hill-start assist control (vehicles with a Multidrive)
On a steep uphill grade, the vehicle may roll backward after hill-start
assist control is released. In this situation, apply the parking brake and
operate the brake pedal when putting the vehicle in motion.
This system operates on flat surfaces as well as steep grades.
When the engine is stopped due to Stop & Start system operation, the
force required to depress the brake pedal may change, but this is not a
malfunction.
When to use the Stop & Start system
Use the Stop & Start system when stopping the vehicle temporarily at red
lights, intersections, etc. When stopping the vehicle for a longer period of
time, turn off the engine completely.

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Stop & Start system warning buzzer
If the engine is stopped by the Stop & Start system and either of the following
actions is performed, a buzzer will sound and the Stop & Start indicator will
flash (vehicles with a Multidrive), or a buzzer will sound (vehicles with a
manual transmission). This indicates that the engine is only stopped by the
Stop & Start system, not that the engine has been turned off completely.
Vehicles with a Multidrive: The driver’s door is opened when the shift
lever is in D or M.
Vehicles with a Multidrive: The shift lever is shifted into a position other
than N or P with the brake pedal released.
Vehicles with a manual transmission: The shift lever is shifted into a posi-
tion other than N with the clutch pedal released.
If the Stop & Start cancel indicator light continues to flash
The Stop & Start system may be malfunctioning. Contact any authorized
Toyota dealer or repairer, or another duly qualified and equipped profes-
sional.
If the windshield is fogged up while the engine is stopped by the Stop
& Start system
Vehicles with an automatic air conditioning system
Turn the windshield defogger on. (The engine will start due to the auto-
matic engine start function.) (P. 365)
Vehicles with a manual air conditioning system
• Vehicles with a Multidrive: Restart the engine by releasing the brake
pedal (when the shift lever is in D or M) or depress the brake pedal and
shift the shift lever to D or M (when the shift lever is in N or P) (P.
319), or by pressing the Stop & Start cancel switch, and then set the air
outlet selection dial to . (P. 357)
• Vehicles with a manual transmission: Restart the engine by depressing
the clutch pedal (P. 319), or by pressing the Stop & Start cancel
switch, and then set the air outlet selection dial to . (P. 357)
If the windshield fogs up frequently, press the Stop & Start cancel switch to
deactivate the system.

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The Stop & Start system operation time and Stop & Start system total
operation time display
P. 288289
Replacing battery
The installed battery is specific to the Stop & Start system. It should only be
replaced with a battery of identical type and rating.
Ask any authorized Toyota dealer or repairer, or another duly qualified and
equipped professional for further details.
CAUTION
When the Stop & Start system is operating
Keep the shift lever in N and apply the brake pedal or parking brake for
safety while the engine is stopped due to the Stop & Start system (while
the Stop & Start indicator is on).
Unexpected accidents may occur due to the automatic engine start func-
tion.
Do not leave the vehicle while the engine is stopped due to the Stop &
Start system (while the Stop & Start indicator is on).
Unexpected accidents may occur due to the automatic engine start func-
tion.
Ensure that the engine is not stopped by the Stop & Start system while the
vehicle is in a poorly ventilated area. The engine may restart due to the
automatic engine start function, causing exhaust gases to collect and
enter the vehicle and resulting in death or a serious health hazard.

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Driving assist systems
To help enhance driving safety and performance, the following sys-
tems operate automatically in response to various driving situations.
Be aware, however, that these systems are supplementary and
should not be relied upon too heavily when operating the vehicle.
ABS (Anti-lock Brake System)
Helps to prevent wheel lock when the brakes are applied suddenly, or if
the brakes are applied while driving on a slippery road surface
Brake assist
Generates an increased level of braking force after the brake pedal is
depressed when the system detects a panic stop situation
VSC (Vehicle Stability Control) (if equipped)
Helps the driver to control skidding when swerving suddenly or turning
on slippery road surfaces
TRC (Traction Control) (if equipped)
Helps to maintain drive power and prevent the drive wheels from spin-
ning when starting the vehicle or accelerating on slippery roads
Hill-start assist control
Except hybrid vehicle (vehicles with a Stop & Start system and a
Multidrive)
Helps to prevent the vehicle from rolling backward when the brake
pedal is released to restart the engine
Hybrid vehicle
P. 332
EPS (Electric Power Steering)
Employs an electric motor to reduce the amount of effort needed to turn
the steering wheel

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Disabling the TRC/VSC systems (except hybrid vehicle)
If the vehicle gets stuck in fresh snow or mud, the TRC/VSC systems
may reduce power from the engine to the wheels. You may need to
turn the system off to enable you to rock the vehicle in order to free it.
Turning off the TRC system only
To turn the TRC system off,
quickly press and release the
button.
The “TRC OFF” indicator light will
come on.
Press the button again to turn the
system back on.
Turning off both TRC and VSC systems
To turn the TRC and VSC sys-
tems off, press and hold the but-
ton for more than 3 seconds
while the vehicle is stopped.
The “TRC OFF” indicator light
and VSC OFF indicator light will
come on.
Press the button again to turn the
systems back on.

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Hill-start assist control operation conditions (except hybrid vehicle)
The shift lever is in D or M.
The brake pedal is not depressed.
When the “TRC OFF” indicator light comes on even if the VSC OFF
switch has not been pressed (except hybrid vehicle)
TRC and hill-start assist control cannot be operated. Contact any authorized
Toyota dealer or repairer, or another duly qualified and equipped profes-
sional.
Sounds and vibrations caused by the ABS, brake assist, TRC and VSC
systems
A sound may be heard from the engine compartment when the brake
pedal is depressed repeatedly, when the engine is started or just after the
vehicle begins to move. This sound does not indicate that a malfunction
has occurred in any of these systems.
Any of the following conditions may occur when the above systems are
operating. None of these indicates that a malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.
• The brake pedal may pulsate slightly after the ABS is activated.
• The brake pedal may move down slightly after the ABS is activated.
EPS operation sound
When the steering wheel is operated, a motor sound (whirring sound) may
be heard. This does not indicate a malfunction.
Reactivation of the TRC/VSC systems after turning off the engine
(except hybrid vehicle)
Even after the TRC/VSC systems have been turned off, turning the engine
off and then on again will automatically reactivate the TRC/VSC systems.
Reactivation of the TRC system linked to vehicle speed (except hybrid
vehicle)
When only the TRC system is turned off, the TRC system will turn on when
vehicle speed increases. However, when both TRC and VSC systems are
turned off, the systems will not turn on even when vehicle speed increases.

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Reduced effectiveness of the EPS system
The effectiveness of the EPS system is reduced to prevent the system from
overheating when there is frequent steering input over an extended period of
time. The steering wheel may feel heavy as a result. Should this occur,
refrain from excessive steering input or stop the vehicle and turn the engine
(except hybrid vehicle) or hybrid system (hybrid vehicle) off. The EPS sys-
tem should return to normal within 10 minutes.
If the slip indicator comes on
It may indicate a malfunction in the driving assist systems. Contact any
authorized Toyota dealer or repairer, or another duly qualified and equipped
professional.
CAUTION
The ABS does not operate effectively when
Tires with inadequate gripping ability are used (such as excessively worn
tires on a snow covered road).
The vehicle hydroplanes while driving at high speed on wet or slick roads.
Stopping distance when the ABS is operating may exceed that of nor-
mal conditions
The ABS is not designed to shorten the vehicle’s stopping distance. Always
maintain a safe distance from the vehicle in front of you in the following situ-
ations:
When driving on dirt, gravel or snow-covered roads
When driving with tire chains
When driving over bumps in the road
When driving over roads with potholes or roads with uneven surfaces
TRC may not operate effectively when
Directional control and power may not be achievable while driving on slip-
pery road surfaces, even if the TRC system is operating.
Do not drive the vehicle in conditions where stability and power may be lost.
Hill-start assist control does not operate effectively when
Do not overly rely on the hill-start assist control. The hill-start assist control
may not operate effectively on steep inclines and roads covered with ice.

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CAUTION
When the VSC is activated
The slip indicator light flashes. Always drive carefully. Reckless driving may
cause an accident. Exercise particular care when the indicator light flashes.
When the TRC/VSC systems are turned off (except hybrid vehicle)
Be especially careful and drive at a speed appropriate to the road condi-
tions. Do not turn the TRC/VSC systems off unless necessary, as these are
the systems to ensure vehicle stability and driving force by automatically
controlling braking and engine outputs.
Replacing tires
Make sure that all tires are of the specified size, brand, tread pattern and
total load capacity. In addition, make sure that the tires are inflated to the
recommended tire inflation pressure level.
The ABS, TRC and VSC systems will not function correctly if different tires
are installed on the vehicle.
Contact any authorized Toyota dealer or repairer, or another duly qualified
and equipped professional for further information when replacing tires or
wheels.
Handling of tires and the suspension
Using tires with any kind of problem or modifying the suspension will affect
the driving assist systems, and may cause a system to malfunction.

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Diesel particulate filter system
: If equipped
Replacing the engine oil
P. 471
When the deposit collected by the filter reaches a predetermined
amount, it is automatically cleaned.
Cleaning the DPF catalytic converter
Cleaning the DPF catalytic converter is performed as necessary
in accordance with driving conditions.
Equipment characteristics
The DPF system has the following characteristics:
Idle speed increases during cleaning
The smell of the exhaust gas changes
When starting the engine, white-colored steam (water vapor)
may be expelled during cleaning
Acceleration performance may degrade during cleaning

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CAUTION
Exhaust pipe
Do not touch the exhaust pipe during cleaning, as the exhaust pipe and
exhaust gases will become particularly hot. Also, make sure that there are
no people or flammable materials near the exhaust pipe while the vehicle is
stopped.
Failure to do so may cause injury by burning or a fire.
NOTICE
To prevent the DPF system from failing
Do not use fuel other than the specified type
Do not use engine oil other than the recommended type
Do not modify the exhaust pipe