fuel consumption TOYOTA PRIUS 2001 Service Repair Manual

NEW MODEL OUTLINE
Gasoline engine + AC motor = TOYOTA Hybrid System (THS)
Tremendous improvement in fuel efficiency & clean achieved!
Inverter1NZ-FXE
engine
P111 Hybrid transaxleHV battery182MO11182MO12
Hybrid transaxle
13
TOYOTA Hybrid System (THS)
The TOYOTA hybrid system has two drive sources, one is the gasoline engine and the other, the AC motor.
The power train system selects the best combination of the different characteristics of both depending on
driving conditions. Also, through the adoption of a regenerative braking system, which recovers energy
during deceleration and ªidling stopº whereby the engine is stopped during idling, we have been able to
provide for maximum energy conservation. This has resulted in a vastly superior fuel economy compared
with that of gasoline A/T vehicles of the same displacement.
Features of the System
1. Optimum distribution of drive sources
The most efficient engine operating zone is automatically selected by controlling the optimum distribution of the engine and motor
drive energy sources.
2. Reduced energy loss
The engine is automatically stopped when starting and travelling at low load to reduce fuel consumption.*1
The kinetic energy that used to be lost through engine or foot braking is recovered by the regenerative braking system and used
for recharging, thereby contributing to improved fuel efficiency. When the driver applies the brakes, the hydraulic and regenera-
tive braking systems are coordinated. In order to recover more energy, a higher proportion of regenerative braking is used.
3. Not required for recharging from an external source
The system uses MG1 (Motor Generator No.1) and MG2 (Motor Generator No.2) to maintain a constant battery charge, so unlike
an electric vehicle, recharging from an external source is not required.
*1 : In some cases, the engine does not stop, depending on the air conditioner and HV battery (Hybrid Vehicle Battery) status.
System configuration
P111 HYBRID TRANSAXLE
Fitted with built-in THS transaxle MG1 (Motor Generator No.1), MG2 (Motor Generator No.2), power spliting device and reduction
gears for the hybrid system. These function to switch engine operation to MG2 assistance, HV battery charging and power generation
for driving MG2.
Inverter
This controls the current between MG1, MG2 and HV battery and converts DC/AC power.
HV Battery (Hybrid Vehicle Battery)
This supplies power to the motor at full load or on engine stopping and stores power recovered by regenerative braking or power
generation by MG1. 228 nickel-metal hydride batteries are connected in series to obtain a voltage of 273.6 V DC.

NEW MODEL OUTLINE
MAIN EQUIPMENT
182MO20
[Information Screen]
<Energy monitoring screen>This screen indicates the direction of energy trans-
mission. It is also possible to check the current drive
method (engine, motor or both) and status of power
generation by the engine and that of charging regen-
erative energy.
<Fuel consumption screen>This screen indicates the average fuel consumption,
amount of recovered energy and fuel consumption for
that moment. Average fuel consumption is displayed
at 5-minutes intervals. The recovered energy display
indicates the amount of energy recovered over the past
5 minutes, with each mark representing 50Wh.
182BE36
182BE37
17
A range of features for comfort - the more you use them,
the better they get.
Multi-Information Display

The 5.8º wide touch panel type multi-information color LCD
is standard.

Energy monitor, fuel consumption and other vehicle information
screens, audio operation status and audio operation screen can
be indicated on the multi-information display. The outside tem-
perature are also indicated on the screen.
[Audio system]

An AM/FM cassette and 4-speaker system compatible with the
multi-information display has been adopted.

As the touch panel type display is used to operate the audio sys-
tem, the multi-information display simultaneously indicates the
operating status of the audio system.

The antenna provided is a collapsible style pole antenna posi-
tioned at the center of the roof.
[GPS Voice Navigation]

A GPS (Global Positioning System) voice navigation system
is optional.

The multi-information display can show the map on favorite
type among turn list, arrow display and enlarged intersection.

Using DVD (Digital Versatile Disk) as a memory source for map
data, a large quantity of information can be processed.
 Main Function of the Multi-information Display
ScreenFunction
Enlargement / reduction, rotation and move-
ment of map
Mapscreen
Indication of current position and direction of
travel
Map screen
displayCorrection of current positiondis lay(option)Setting, change and indication of route()
Voice guidance
Indication of enlarged intersections
Memory and indication of map position
Audio screenStatus of audio equipment and audio opera-
tion screen indication
InformationEnergy monitor screen indicationInformationscreenFuel consumption screen indication
Adj t tSound quality adjustment screen indicationAdjustmentscreenImage quality adjustment screen indicationscreenNo indication
On-screenAudio status indicationOn screenindicationWarning indication
Interrupt screenWarning indication
DiagnosisscreenDisplays system diagnosisscreen
displayDisplays various types of coefficient settings

ENGINE ± 1NZ-FXE ENGINE
182EG05
FrontExhaust Side
Crankshaft Center
Bore Center
8 mm
Intake Side12 mm
182EG06
Taper Squish Shape47
2. Cylinder Block

A cylinder block made of aluminum alloy has been adopted to realize a significant amount of weight reduc-
tion.

A water pump swirl chamber and an inlet passage to the pump are provided in the cylinder block.

The rear portion of the cylinder block has been shaped conically to improve the coupling rigidity with the
transaxle.

Through the adoption of the offset crankshaft, the bore center has been shifted 12 mm towards the intake,
in relation to the crankshaft center. Thus, the side force when the maximum pressure is applied has been
reduced and the heat efficiency has been improved. And as a result, fuel economy has been improved.

Through the use of a thin-walled cast iron liner in the cylinder bore, a distance of 8 mm between the bores
has been realized, resulting in a compact package. This liner is thin, so that boring is not possible.

By discontinuing the use of the rear oil seal retainer and by pressing the rear oil seal into the cylinder block,
a compact package has been realized.
3. Piston

The taper squish shaped piston has been
adopted to improve combustion chamber.

Low-tension piston rings have been adopted to
reduce friction and improve fuel economy and
oil consumption performance.

By increasing the mechining precision of the
cylinder bore diameter, the outer diameter of
the piston has been made into the one type.

THS (TOYOTA HYBRID SYSTEM)
THS (TOYOTA HYBRID SYSTEM)
182TH03
Planetary Gear UnitMG1
InverterHV
Battery
MG2
Differential
Gear Unit
Engine
Hybrid Transaxle
Mechanical Power Path
Electrical Path
182TH01
Battery
*
1
Inverter
*
2Engine
Generator Electric Motor
*
1: Direct Current
*2: Alternating Current
182TH02
Battery
Inverter
Engine
Motor / Generator Transmission 22

DESCRIPTION
The hybrid system is a type of powertrain that uses a combination of two types of motive forces, such as an
engine and a motor (MG2). This system is characterized by its skillful use of two types of motive forces ac-
cording to the driving conditions. It maximizes the strengths of each of the motive forces and complements
their weaknesses. Thus, it can achieve a highly responsive, dynamic performance, as well as a dramatic re-
duction in fuel consumption and exhaust gas emissions. The THS can be broadly divided into two systems:
the series hybrid system, and the parallel hybrid system.
± REFERENCE ±
Series Hybrid System
In the series hybrid system, the engine runs a genera-
tor, and the generated electricity enables the electric
motor to drive the wheels. This type of vehicle can be
described as an electric car that is equipped with an
engine-driven generator.
Equipped with a low-output engine, the engine is op-
erated at a practically constant speed in its most ef-
fective range, in order to efficiently recharge the bat-
tery while the vehicle is in motion.
Parallel Hybrid System
This system uses both the engine and the electric mo-
tor to directly drive the wheels is called the parallel
hybrid system. In addition to supplementing the mo-
tive force of the engine, the electric motor in this sys-
tem can also serve as a generator to recharge the bat-
tery while the vehicle is in motion.

BODY ELECTRICAL ± ACCESSORIES173
ACCESSORIES
MULTI-INFORMATION DISPLAY
1. General
A multi-information display has been provided on top of the center console as standard equipment.
Consisting of a 5.8-inch wide LCD (Liquid Crystal Display) screen, this multi-information display pro-
vides a vehicle information screen, warning screen, and an audio operation screen. The outside tempera-
ture is also shown on the screen.
A GPS (Global Positioning System) voice navigation is offered as an option. Through the use of the GPS
and the map data in a DVD (Digital Versatile Disc), this navigation system analyzes the position of the
vehicle and indicates that position on the map that is displayed on the screen. Additionally, it provides
voice instructions to guide the driver through the route to reach the destination that has been selected.
Listed below are the main functions of the multi-information display.
Function
Outline
Map Screen Display*
Enlargement / reduction, rotation and movement of map.
Indication of current position and direction of travel.
Correction of current position.
Setting, change and indication of route.
Voice guidance.
Indication of enlarged intersections.
Memory and indication of map position.
Audio Screen DisplayStatus of audio equipment and audio operation screen indication.
Information
Screen DisplayEnergy monitor screen indication.
Fuel consumption screen indication.
Adjustment
Screen DisplaySound quality adjustment screen indication.
Image quality adjustment screen indication.
No indication.
On-screen DisplayAudio status indication.
Warning indication.
Interrupt Screen
DisplayWarning indication.
Diagnosis Screen
DisplayDisplay system diagnosis.
Displays various type of coefficient settings.
*: with GPS Voice Navigation System

BODY ELECTRICAL ± ACCESSORIES
182BE37 182BE36
177
Item
Outline
Right or Left Turn
GuidanceVoice guidance to instruct the direction of travel to be
taken.
Freeway Direction of
Travel GuidanceVoice guidance to instruct the direction of travel to take
on the freeway.
Guidance
Distance Display to
DestinationDisplays the distance from the present location to the
destination.
GuidanceFreeway Branch Type
Specimen GuidanceType specimen for guidance to a freeway branch.
Intersection Zoom-in
DisplayZoom-in display when approaching an intersection.
Turn List DisplayDisplays a turn list on the right side of the two-screen
display when approaching an intersection.
2) Information Screen
The information screen provides two types of indications: the energy monitor screen indication that dis-
plays the present energy flow of the hybrid system, and the fuel consumption screen indication that dis-
plays the average fuel consumption rate, the amount of regenerative energy, and the instantaneous fuel
consumption rate.
a. Energy Monitor Screen Indication
This screen indicates the energy transmis-
sion direction for checking the current drive
method (engine, motor or both), the power
generation status by the engine and status of
regenerative energy use.
b. Fuel Consumption Screen Indication
This screen indicates the average fuel con-
sumption, recovered energy and the current
fuel consumption, all at once.
The average fuel consumption is calculated
using 5-minute units. The recovered energy
over the past 5 minutes is indicated by sym-
bols, with one mark representing 50 Wh.
In addition, the total fuel consumption be-
fore resetting and the total travel distance are
displayed at the right bottom of the screen.

EM1IT±02
F12396
TOYOTA Hand±held
Tester
DLC3
A13923
± ENGINE MECHANICALCOMPRESSION
EM±3
111 9 Author: Date:
2001 PRIUS (RM778U)
COMPRESSION
INSPECTION
HINT:
If there is lack of power, excessive oil consumption or poor fuel
economy, measure the compression pressure.
NOTICE:
The measurement of compression pressure should be per-
formed in the Cranking Mode.
1. WARM UP AND STOP ENGINE
Allow the engine to warm up to normal operating temperature.
2. REMOVE AIR CLEANER ASSEMBLY
3. REMOVE IGNITION COIL (See page IG±6)
4. REMOVE SPARK PLUGS
5. CONNECT TOYOTA HAND±HELD TESTER
(a) Connect the TOYOTA hand±held tester to the DLC3.
(b) Select the cranking mode on the TOYOTA hand±held tes-
ter.
(c) Please refer TOYOTA hand±held tester operato's manual
for further details.
6. INSPECT CYLINDER COMPRESSION PRESSURE
(a) Insert a compression gauge into the spark plug hole.
(b) Fully open the throttle.
(c) While cranking the engine, measure the compression
pressure.
HINT:
In the Cranking Mode, the engine speed is automatically con-
trolled at 250 rpm and the throttle valve is also automatically set
in fully±opened condition.
(d) Repeat steps (a) through (c) for each cylinder.
NOTICE:
This measurement must be done in as short a time as pos-
sible.
Compression pressure:
728 kPa (7.4 kgf/cm
2, 106 psi)
Minimum pressure:
534 kPa (5.4 kgf/cm
2, 77 psi)
Difference between each cylinder:
98 kPa (1.0 kgf/cm
2, 14 psi) or less