2002 TOYOTA PRIUS engine

1
Foreword
Welcome to the growing group of value−
conscious people who drive Toyotas. We
are proud of the advanced engineering
and quality construction of each vehicle
we build. This Owner ’s Manual explains the op-
eration of your new Toyota. Please read
it thoroughly and have all the occu-
pants follow the instructions carefully.
Doing so will help you enjoy many
years of safe and troublefree motoring.
For important information about this
manual and your Toyota, read the fol-
lowing pages carefully.When it comes to service, remember that
your Toyota dealer knows your vehicle
best and is interested in your complete
satisfaction. He will provide quality mainte-
nance and any other assistance you may
require.
If there is not a Toyota dealer near you, or you need emergency assistance for any reason, please call the following number:
U.S. OWNERS: To y o t a C u s -
tomer Assistance Center
Tollfree:18003314331
CANADIAN OWNERS: Toyota Cana-
da Customer Interaction Centre
Tollfree:1888TOYOTA8
(18888696828)
Please leave this Owner ’s Manual in
this vehicle at the time of resale. The
next owner will need this information
also. All information and specifications in this
manual are current at the time of printing.
However, because of Toyota’s policy of
continual product improvement, we reserve
the right to make changes at any time
without notice.
Please note that this manual applies to
all models and explains all equipment,
including options. Therefore, you may
find some explanations for equipment
not installed on your vehicle.
©2001 TOYOTA MOTOR CORPORATION
All rights reserved. This material may not
be reproduced or copied, in whole or in
part, without the written permission of Toy-
ota Motor Corporation.

8
Precautions for useof hybrid vehicle
The vehicle has both high voltage
DC and AC systems as well as a
12volt system. DC and AC high
voltage are both very dangerous
and can cause death or serious inju-
ry, severe burns and electric shock.
In order to avoid personal in-
juries, do not touch the high
voltage cables (orange col-
ored) and their connectors.
Follow the caution labels at-
tached to the high voltage
parts.
Do not remove or replace the
high voltage parts such as
the inverter unit (located in
the engine compartment), hy-
brid vehicle battery (located
between rear seat and trunk),
etc.
Do not touch the service plug
located in the left side trim
of the trunk without hybrid
system technical training.
(See “Precautions for use” on
page 12 in Section 12.) This
component is provided to dis-
able the high voltage system
in case of servicing at a To-
yota dealer.

5
Indicator symbols on the instrument panel and Multiinformation display
or
orBrake system warning light∗1
Discharge warning light∗1
Seat belt reminder light∗1
Front passenger ’s seat belt reminder light∗1
Malfunction indicator lamp∗1
Low coolant temperature indicator light
(in blue)∗1
High coolant temperature warning light (in red)∗1
Low fuel level indicator light∗1
Low engine oil pressure warning light∗1
Open door warning light∗1
Master warning light∗1
Anti −lock brake system warning light∗
1
Headlight high beam indicator light
Headlight indicator light Turn signal indicator lights SRS warning light
∗1

8
Toyota hybrid system combines the
gasoline engine and the electric motor
power to improve the fuel economy
largely and minimize the emissions as
well as to provide higher power perfor-
mance than the ordinary gasolinepow-
ered vehicles.
Depending on the driving condition, the
vehicle runs on the best combination of;
Gasoline engine power
Electric motor power generated by
the gasoline engine
Electric motor power of the hybrid
vehicle battery
Furthermore, the energy is effectively used
in the following ways:
When stopping the vehicle, the gaso-
line engine is automatically stopped.
When decreasing the speed by apply-
ing the brakes, electricity converted
from the turning force of the wheels is
stored in the hybrid vehicle battery.
(This is called regenerative brake.) Since the battery is charged by the
gasoline engine as needed, it does not
require charging from the outside like
an electric vehicle.
In this way, greatly improved fuel economy
and reduced emissions are attained.
If you do not use the vehicle for a long
time, the hybrid vehicle battery will dis-
charge and the battery condition is liable
to decline.
Basic operations are described below. Be-
sides, Toyota hybrid system performs vari-
ous controls depending on the operating
condition, such as at the time of hybrid
system starting, at the time of charging
should be required, at the time of the air
conditioning is in use, etc.
Toyota hybrid system
Toyota hybrid system
operating condition

9
12p016a
Electric power
in use
When starting or backing up, etc., the
gasoline engine efficiency worsens, so
the vehicle runs on electric power from
hybrid vehicle battery.
12p017a
Gasoline power
in use
During normal driving, the vehicle runs
mainly on gasoline power. However, the
electric motor, using electric power gener-
ated by the gasoline engine, makes up for
any deficiency of gasoline power.
The vehicle controls the optimum ratio of
the gasoline and electric power to help
save energy more effectively.
12p018a
Electric and gasoline
power in use
When driving at full throttle, electric
power is further applied from the hybrid
vehicle battery. Vehicle performance impro-
ves.

10
12p019a
Storing electric power
When decreasing speed or applying the
brakes, the turning force of the wheels
makes the electric motor operate as a
generator and additional electricity is
stored in the hybrid vehicle battery (regen-
erative brake).
12p020a
Not in use
When stopping, the gasoline engine auto-
matically shuts off.
12p030
Charging hybrid vehicle battery
When the hybrid vehicle battery power is
insufficient, the gasoline engine charges
the hybrid vehicle battery. The system al-
ways supplies electricity at a constant lev-
el.

11
Turn the ignition key from “ON” to
“START” with the running mode selector
lever in “P” position only. When the
“READY” light flashes and stays on and
a beep sounds after a few seconds, the
hybrid system starts. (If the ambient tem-
perature is low such as during winter con-
ditions, it may take time until the
“READY” light is on.) Being different from
ordinary vehicles, you cannot start your
vehicle with the running mode selector le-
ver in “N” position. (For details, see “How
to start the hybrid system—” on page 162
in Section 4.)Drive your vehicle with a smooth accel-
eration and deceleration.
When driving, energy is effectively re-
covered through the regenerative brake
as the vehicle decelerates. However,
for more efficient use, do not acceler-
ate or decelerate your vehicle more
than necessary.
By avoiding abrupt acceleration and de-
celeration, the remaining capacity of
the hybrid vehicle battery can be pre-
served and it makes it possible to run
the vehicle utilizing the gasoline engine
and the electric power from the hybrid
vehicle battery.
The remaining capacity of the hybrid
vehicle battery can be confirmed on
the energy monitor screen of the multi
−
information display. See “Information”
on 113 page in Section 2 −6 for details.
As the way in which you drive may
decrease the remaining capacity of the
hybrid vehicle battery and reduce fuel
economy, drive your vehicle without
abrupt acceleration or deceleration. Use the “A/C” mode (with the “A/C”
button only on) when you use the air
conditioning.
As the gasoline engine starts and
stops automatically in this mode, eco-
nomical driving with less emissions is
possible.
In the “MAX” mode (with the “A/C” but-
ton and “MAX” button on), the gasoline
engine is frequently used. Use this
mode only when you need to operate
the air conditioning fully such as when
you should dehumidify or when you are
under a burning sun.
When parking, be sure to put the run-
ning mode selector lever in “P” posi-
tion. While driving, use “D” position.
With the selector lever in “N” position,
the gasoline engine operates but elec-
tricity cannot be generated. The
constant electrical power remaining in
the hybrid vehicle battery becomes in-
sufficient and the battery will be dis-
charged.
Starting your vehicle For efficient use of your
vehicle

12
The hybrid system automatically con-
trols the level of electrical power re-
maining in the hybrid vehicle battery.
With the selector lever in a position
other than “N”, electricity is generated
and charging occurs when the level of
electrical power in the hybrid vehicle
battery decreases. It is unnecessary to
charge the hybrid vehicle battery from
outside.
INFORMATION:
The gasoline engine starts and stops
automatically. (It stops during a low
load driving, deceleration or when the
vehicle stopped.)
If the “READY” light remains on, you
can start your vehicle using the electric
motor even with the gasoline engine
stopped.
The gasoline engine may not stop auto-
matically in the following conditions:
 During under gasoline engine warm
up
 During hybrid vehicle battery charg-
ing
 When the air conditioning is used in
the “MAX” mode, the gasoline engine
is frequently used. If the output control warning light ()
comes on in the instrument cluster, the
hybrid vehicle battery temperature is
low or high, or the hybrid vehicle bat-
tery capacity is decreased with the se-
lector lever at “R” during driving. As it
does not indicate the failure of the sys-
tem, you can continue driving but avoid
hard acceleration because the power is
insufficient (which is caused by the bat-
tery power deterioration).
The vehicle runs in combination with
the gasoline and electric power. Pay
special attention to the following items.
Be careful of a high voltage and high
temperature.
Your vehicle is equipped with the orange
colored cables connected to the hybrid
vehicle battery which contain a high volt-
age (about 300 V) and to other high volt-
age parts.
CAUTION
Do not touch or come in contact with
orange cables or battery terminals.
Electric shock may cause serious in-
jury or death. Read all caution labels.
A electric motor, coolant radiator and
some other parts reach high temperature
when you are driving. Caution labels are
applied to these parts. Carefully observe
the instructions on these caution labels.
Precautions for use