2007 TOYOTA PRIUS engine

326
30p103
Electric water pumpCoolant heat storage
tank
Coolant flow control
valve
The coolant heat storage tank system
stores hot coolant and feeds it via the
electric water pump automatically to warm
the engine as required. This system helps
generate clean emissions. To confirm the
coolant heat storage system check, the
pump may operate automatically with the
vehicle stopped (in the “OFF” mode).
Although the pump may operate and
cause noise while the vehicle is stopped,
this does not indicate a malfunction.
CAUTION
The coolant in this tank is hot even
if the engine and radiator are cold.
For replacement of the coolant,
contact your Toyota dealer.
Do not touch bolts (9 pieces)
painted in yellow.
In case the bolts are loosened,
there is a risk of hot coolant com-
ing out from inside the tank.
When this has any malfunction, the
surface of this tank gets hot. To
prevent burning yourself, do not
touch the tank.
INFORMATION
In such cases as the time of engine
starting and a short trip after the
engine is stopped, the electric water
pump will work for a moment, but
this is no problem.
This is for the preparation for good
emission.
Your engine is fitted with iridiumtipped
spark plugs.
NOTICE
Use only iridiumtipped spark plugs.
Do not adjust gaps for engine perfor-
mance or smooth drivability.
Coolant heat storage system Iridiumtipped spark plugs

327
REGENERATIVE BRAKE
When the brake is applied, the electric
motor used as a generator converts kinet-
ic energy into electric energy.
The regenerative brake works in the fol-
lowing operations.1. When the accelerator pedal is re- leased, the reduced speed equal to en-
gine braking in a gasoline −fueled ve-
hicle is obtained in accordance with the
running mode position of the shift le-
ver.
2. When the brake pedal is depressed with the shift lever in “D” or “B”, the
regenerative brake works. HYDRAULIC BRAKE
This brake system has 3 independent hy-
draulic circuits. If either circuit should fail,
the other will still work. However, the ped-
al will be harder to press, and your stop-
ping distance will increase. Also, the
brake system warning light may come on.
CAUTION
Do not drive your vehicle with only a
single brake system. Have your
brakes fixed immediately.
BRAKE ACTUATOR
The brake actuator uses brake fluid pres-
surized by the pump to power
−assist the
brakes. If the brake actuator fails during
driving, the brake system warning light
comes on and buzzer sounds continuous-
ly. In this case, the brakes may not work
properly. If they do not work well, depress
the brake pedal firmly. If the brake system
warning light comes on, immediately stop
your vehicle and contact your Toyota deal-
er. The red and yellow brake system warning
light may stay on for about 60 seconds
after the “IG
−ON” mode is enabled. It is
normal if the light turns off after a while.
Depressing the brake pedal repeatedly
may turn on the red and yellow brake
system warning light and buzzer. It is nor-
mal if the light turns off and the buzzer
stops sounding after a few seconds.
You may hear a small sound in the engine
compartment after the hybrid system is
started or the brake pedal is depressed
repeatedly. This is a pump pulsating
sound of the brake system, and it is not
a malfunction.
In the following conditions, you may hear
a motor sound in the engine compartment.
The brake pedal is depressed when the
hybrid system is turned off.
The driver ’s door is opened.
For a few seconds after the hybrid
system is “OFF” and a bout 90 seconds
have passed.
The brake pedal stroke may be short
when you press the “POWER” switch with
the brake pedal depressed.
Brake system

328
CAUTION
Do not pump the brake pedal if the
hybrid system is not operating.
Each push on the pedal uses up
your reserved brake fluid pressure.
Even if the power assist is com-
pletely lost, the brakes will still
work. But you will have to push the
pedal hard, much harder than nor-
mal. And your braking distance will
increase.
ANTILOCK BRAKE SYSTEM
The antilock brake system is designed
to automatically help prevent lockup of
the wheels during a sudden braking or
braking on slippery road surfaces. This
assists in providing directional stability
and steering performance of the vehicle
under these circumstances.
Effective way to press the ABS brake
pedal: When the anti −lock brake system
function is in action, the slip indicator in
the instrument cluster flashes and you
will hear a noise. In this situation, to let
the anti −lock brake system work for you,
just hold the brake pedal down more
firmly. Do not pump the brake in a panic
stop. This will result in reduced braking
performance.
The anti −lock brake system becomes op-
erative after the vehicle has accelerated
to a speed in excess of approximately 10
km/h (6 mph). It stops operating when the
vehicle decelerates to a speed below
approximately 5 km/h (3 mph). Depressing the brake pedal on slippery
road surfaces such as on a manhole cov-
er, a steel plate at a construction site,
joints in a bridge, etc. on a rainy day
tends to activate the anti
−lock brake sys-
tem.
When the antilock brake system is ac-
tivated, the following condition may oc-
cur. They do not indicate a malfunction
of the system:
You may hear the anti −lock brake sys-
tem operating and the vibrations of the
vehicle body and steering wheel. You
may also hear the motor sound in the
engine compartment even after the ve-
hicle is stopped.

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“ABS” warning light
The light comes on when the “IGON”
mode is enabled. If the antilock brake
system works properly, the light turns
off after the “READY” light comes on.
Thereafter, if the system malfunctions,
the light comes on again.
When the “ABS” warning light is on (and
the brake system warning light is on), the
anti−lock brake system does not operate,
but the brake system still operates con-
ventionally.
If any of the following conditions oc-
curs, this indicates a malfunction some-
where in the components monitored by
the warning light system. Contact your
Toyota dealer as soon as possible to
service the vehicle.
The light does not come on when the
“IG −ON” mode is enabled, or the
“READY” light remains on.
The light comes on while you are driv-
ing.
A warning light turning on briefly during
operation does not indicate a problem.
CAUTION
If the “ABS” warning light remains on
together with the red brake system
warning light, immediately stop your
vehicle at a safe place and contact
your Toyota dealer.
In this case, not only the antilock
brake system function and brake as-
sist function will fail but also the ve-
hicle will become extremely unstable
during braking.
Any of the following conditions may oc-
cur, but does not indicate a malfunc-
tion:
The light may stay on for about 60
seconds after the “IG −ON” mode is en-
abled. It is normal if it turns off after
a whi l e.
Depressing the brake pedal repeatedly
may turn on the light. It is normal if
it turns off after a few seconds. BRAKE ASSIST SYSTEM
When you slam the brakes on, the
brake assist system judges as an emer-
gency stop and provides more powerful
braking for a driver who cannot hold
down the brake pedal firmly.
When you slam the brakes on, more pow-
erful braking will be applied. At this time,
you may hear a sound in the engine
compartment. This does not indicate a
malfunction.
The brake assist system becomes opera-
tive after the vehicle has accelerated to
a speed in excess of approximately 10
km/h (6 mph). It stops operating when the
vehicle decelerates to a speed below
approximately 5 km/h (3 mph).
For an explanation of this system’s warn-
ing light, see “Service reminder indicators
and warning buzzers” on page 125.

332
30p004b
The vehicle identification number (VIN)
is the legal identifier for your vehicle.
This number is on the left top of the
instrument panel, and can be seen
through the windshield from outside.
This is the primary identification number
for your Toyota. It is used in registering
the ownership of your vehicle.
30p005c
The vehicle identification number (VIN) is
also on the Certification Label.
30p006b
Engine number
Motor number
The engine and motor number plates
are installed on the engine and trans-
axle case as shown.
Your Toyota’s identification—
—Vehicle identification
number —Engine and motor number

341
Ti r e relat ed ter m
Meaning
Cold tire inflation pressure
tire inflation pressure when the vehicl
e has been parked for at leas t 3 hour s
or more, or it has not been driven more than 1.5 km or 1 mile under that
condition
Maximum inflation pressurethe maximum cold inflation pressure to which a tire may be inflated and it is
shown on the sidewall of the tire
Recommended inflation pressurecold tire inflation pressure recommended by a manufacturer
Accessory weight
the combined weight (in excess of those standard items which may be replaced)
of automatic transmission, power steering, power brakes, power windows, pow-
er seats, radio, and heater, to the extent that these items are available as
factory −installed equipment (whether installed or not)
Curb weight
the weight of a motor vehicle with standard equipment including the maximum
capacity of fuel, oil, and coolant, and, if so equipped, air conditioning and addi-
tional weight optional engine
Maximum loaded vehicle weight
t he sum of —
(a) curb weight;
(b) accessory weight;
(c) vehicle capacity weight; and
(d) production options weight
Normal occupant weight68 kg (150 lb.) times the number of occupants specified in the second column
of Table 1 that follows
—Glossary of tire terminology

350
1. Check the area around the vehicle be-fore entering it.
2. Adjust seat position, seatback angle, head restraint height and steering
wheel angle.
3. Adjust the inside and outside rear view mirrors.
4. Lock all doors.
5. Fasten seat belts.
When you get in the vehicle, check
whether the “READY” light is on or
not.
CAUTION
Your vehicle does not produce any
noise or vibration when the vehicle is
ready to be driven with the “READY”
light on. Move your foot carefully
from the brake pedal to the accelera-
tion pedal when driving.
1. Apply the parking brake firmly.
2. Turn off unnecessary lights and acces- sories.
3. Depress the brake pedal and hold it to the floor until driving off.
40p102b
Before starting the hybrid system, be sure
to follow the instructions in “(a) Before
starting the hybrid system”.
Normal starting procedure
Carry the key and press the “POWER”
switch briefly and firmly with the brake
pedal depressed. The “READY” light starts
blinking. After a few seconds, the blinking
“READY” light remains on and two beeps
sound. (If the ambient temperature is low,
such as during winter driving conditions,
it may take time until the “READY” light
is on.)
The engine may not start even with the
“READY” light on.
Before starting the hybrid
system How to start the hybrid
system— (a) Before starting
the hybrid system
( b ) Tu rn in g on th e hyb rid
system (Using the smart
function—on some models)

351
You may hear a motor sound in the en-
gine compartment when the brake pedal is
depressed with the hybrid system off.
When the hybrid system is started or
stopped, you may hear a sound coming
from the hybrid battery in the luggage
compartment. However, this does not indi-
cate any trouble.
If there is a problem somewhere in the
hybrid system, the hybrid system malfunc-
tion warning light will come on in place of
the “READY” light. If this happens, contact
your Toyota dealer.
CAUTION
Never start the hybrid system from
outside the vehicle, or an accident
may occur. Be sure to sit on the driv-
er seat, then start the system when
driving.
NOTICE
The hybrid system cannot be
started when the shift position is
“N”. Be sure to put it in “P” and
then start the system.
 If any warning light comes on (See
page 125 for details.) or the 12 volt
battery is disconnected, the hybrid
system may not start by pushing
the “POWER” switch. In that case,
push it once again. If the “READY”
light does not come on, contact
your Toyota dealer.
 When you start the hybrid system
at a lowered outside temperature, it
may take longer before the blinking
“READY” light changes to stay on.
40p002d
Before starting the hybrid system, be sure
to follow the instructions in “(a) Before
starting the hybrid system”.
Normal starting procedure
Insert the key and press the “POWER”
switch briefly and firmly with the brake
pedal depressed. The “READY” light starts
blinking. After a few seconds, the blinking
“READY” light remains on and two beeps
sound. (If the ambient temperature is low,
such as during winter driving conditions,
it may take time until the “READY” light
is on.)
The engine may not start even with the
“READY” light on.
(b) Turning on the hybrid
system (Using the key)