2012 TOYOTA SIENNA engine

5
When trouble arises
723
5-1. Essential information
SIENNA_U (OM45477U)
If your vehicle needs to be towed
Before towingThe following may indicate a problem with your transaxle. Contact
your Toyota dealer before towing.
● The engine is running but the vehicle will not move.
● The vehicle makes an abnormal sound.
If towing is necessary, we recommend having your vehicle towed by
your Toyota dealer or a commercia l towing service, using a wheel-lift
type truck or flat bed truck.
Use a safety chain system for all to wing, and abide by all state/pro-
vincial and local laws.
2WD models: If towing your vehicle with a wheel-lift type truck from
the front, the vehicle’s rear wheels and axles must be in good condi-
tions. ( P. 724, 726)
If they are damaged, use a towing dolly or flat bed truck.
AWD models: If towing your vehicle with a wheel-lift type truck, use a
towing dolly. (P. 724, 726)

5
When trouble arises
727
5-1. Essential information
SIENNA_U (OM45477U)
If you think something is wrong
If you notice any of the following symptoms, your vehicle probably
needs adjustment or repair. Contact your Toyota dealer as soon as
possible.
■ Visible symptoms
●Fluid leaks under the vehicle
(Water dripping from the air cond itioning after use is normal.)
● Flat-looking tires or uneven tire wear
● Engine coolant temperature g auge needle continually points
higher than normal
■ Audible symptoms
●Changes in exhaust sound
● Excessive tire squeal when cornering
● Strange noises related to the suspension system
● Pinging or other noises related to the engine
■ Operational symptoms
●Engine missing, stumbling or running rough
● Appreciable loss of power
● Vehicle pulls heavily to one side when braking
● Vehicle pulls heavily to one side when driving on a level road
● Loss of brake effectiveness, s pongy feeling, pedal almost
touches the floor

728
5-1. Essential information
SIENNA_U (OM45477U)
Fuel pump shut off system
Follow the procedure below to restart the engine after the system is
activated.
Vehicles without a smart key system
Turn the engine switch to the “ACC” or “LOCK” position.
Restart the engine.
Vehicles with a smart key system Turn the “ENGINE START STOP” switch to ACCESSORY
mode or turn it off.
Restart the engine.
NOTICE
■Before starting the engine
Inspect the ground under the vehicle.
If you find that fuel has leaked onto the ground, the fuel system has been
damaged and is in need of repair. Do not restart the engine.
To minimize the risk of fuel leakage when the engine stalls or when
an airbag inflates upon collision , the fuel pump shut off system
stops the supply of fuel to the engine.
STEP1
STEP2
STEP1
STEP2

730 5-2. Steps to take in an emergency
SIENNA_U (OM45477U)
Stop the vehicle immediately.The following warnings indicate the possibility of damage to the vehi-
cle that may lead to an accident. Immediately stop the vehicle in a
safe place and contact your Toyota dealer.
Have the vehicle inspected immediately.Failure to investigate the cause of the following warnings may lead to
the system operating abnormally and possibly cause an accident.
Have the vehicle inspected by your Toyota dealer immediately.
Warning lightWarning light/Details
Charging system warning light Indicates a malfunction in the vehicle’s charging system
Low engine oil pressure warning light Indicates that the engine oil pressure is too low
Warning lightWarning light/Details
(U.S.A.)
(Canada) Malfunction indicator lamp
Indicates a malfunction in:
• The electronic engine control system;
• The electronic throttle control system; or
• The electronic automatic transaxle control system
SRS warning light Indicates a malfunction in:
• The SRS airbag system;
• The front passenger occupant classification system; or
• The seat belt pretensioner system

736 5-2. Steps to take in an emergency
SIENNA_U (OM45477U)
*1:Open door warning buzzer:A buzzer will sound if the vehicle reaches a speed of 3 mph (5 km/h) with any
door open.
*2:Driver’s and front passenger’s seat belt warning buzzers:The driver’s and front passenger’s seat belt warning buzzers sound to alert
the driver and front passenger that his or her seat belt is not fastened. The
buzzer sounds intermittently for 10 seconds after the vehicle has reached a
speed of 12 mph (20 km/h). Then, if the seat belt is still unfastened, the
buzzer will sound at a different tone for 20 more seconds.
*3:Refer to the separate “Scheduled Maintenance Guide” or “Owner’s ManualSupplement” for the maintenance interval applicable to your vehicle.
Warning lightWarning light/DetailsCorrection procedure
(AWD models) Active Torque Control
4WD system warning light
When the light blinks: The
system has been over-
loaded and front-wheel
drive has been automati-
cally engaged. Drop your speed or stop the
vehicle until the light stops
blinking. (Do not stop the
engine.)
When the light comes on:
Malfunction in the Active
Torque Control 4WD sys-
tem. Have the system checked
by your Toyota dealer.

740 5-2. Steps to take in an emergency
SIENNA_U (OM45477U)
■If the tire pressure warning light frequently comes on after blinking
for 1 minute
Vehicles without a smart key system
If the tire pressure warning light frequently comes on after blinking 1
minute when the engine switch is turned to the “ON” position, have it
checked by your Toyota dealer.
Vehicles with a smart key system
If the tire pressure warning light frequently comes on after blinking 1
minute when the “ENGINE START STOP” switch is turned to IGNITION
ON mode, have it checked by your Toyota dealer.
■ Customization that can be co nfigured at Toyota dealer
The vehicle speed linked seat belt reminder buzzer can be disabled.
(Customizable features P. 815) However, Toyota recommends that the
seat belt reminder buzzer be operational to alert the driver and front passen-
ger when seat belts are not fastened.

5
When trouble arises
747
5-2. Steps to take in an emergency
SIENNA_U (OM45477U)
If you have a flat tire (vehicles with standard tires)
Remove the flat tire and replace it with the spare tire provided.
■Before jacking up the vehicle
●Stop the vehicle on a hard, flat surface.
● Set the parking brake.
● Shift the shift lever to P.
● Stop the engine.
● Turn on the emergency flashers.
■ Location of the spare tire, jack and tools
Spare tire Jack
Wheel nut wrench
Jack handle Tire bag
Adapter socket
Tire strap

758 5-2. Steps to take in an emergency
SIENNA_U (OM45477U)
CAUTION
■Speed limit when using the compact spare tire
Do not drive at speeds in excess of 50 mph (80 km/h) when a compact
spare tire is installed on the vehicle.
The compact spare tire is not designed for driving at high speeds. Failure
to observe this precaution may lead to an accident causing death or seri-
ous injury.
■Using the tire jack
Improper use of the tire jack may cause the vehicle to suddenly fall off
the jack, leading to death or serious injury.
●Do not use the tire jack for any pu rpose other than replacing tires or
installing and removing tire chains.
●Only use the tire jack that comes with this vehicle for replacing a flat
tire. Do not use it on other vehicles, and do not use other tire jacks for
replacing tires on this vehicle.
●Always check that the tire jack is securely set to the jack point.
●Do not put any part of your body under the vehicle while it is supported
by the jack.
●Do not start or run the engine while your vehicle is supported by the
jack.
●Do not raise the vehicle while someone is inside.
●When raising the vehicle, do not put an object on or under the jack.
●Do not raise the vehicle to a hei ght greater than that required to
replace the tire.
●Use a jack stand if it is necessary to get under the vehicle.
Take particular care when lowering the vehicle to ensure that no one
working on or near the vehicle may be injured.