fuel type TOYOTA PRIUS 2001 Service Repair Manual

NEW MODEL OUTLINE
182MO18
182MO19
182EG03
kW
60
50
40
30
20
10 N´m
120
11 0
100
90
80
Engine Speed (rpm) 1,000 2,000 3,000 4,000 5,000(52/4,500)
(111/4,200)
Torque
Output
15
HV Battery Charging
When high load operation is continued, the engine
does not stop to charge the HV battery even
if the vehicle is stopped, in order to keep the
HV battery charged to a given level. (when
ªREADYº light is ON.) ;however, the engine does
not charge the HV battery when the lever is
shifted into the ªNº position.
The engine speed may also be increased during normal
traveling in order to charge the HV battery.
1NZ-FXE Engine
The new Prius is fitted with a 1.5
gasoline engine which has been developed for the use with the TOYOTA
hybrid system. A mass of leading-edge technology has been implemented to achieve excellent fuel economy,
low emissions, light weight, compactness, and low vibration and noise.
Outline of the 1NZ-FXE Engine Engine performance curve
1NZ-FXE
Displacement (m
)1,497
TypeDOHC 4 valves
Bore y Stroke (mm)75.0 y 84.7
Compression ratio13.0
Maximum output [kW (HP)/rpm]52 (70)/4,500
Maximum torque [N´m (lb´ft)/rpm]111 (82)/4,200
FuelGasoline

NEW MODEL OUTLINE
MAIN MECHANISM
182CH29
16
4 Features of the 1NZ-FXE engine
1. Highly efficient and high expansion ratio gasoline engine
Adoption of a super fuel-efficient engine developed for use with THS. Its high expansion ratio cycle is achieved by applying the
Atkinson cycle*1 which obtains high thermal efficiency.
2. Reduction in frictional loss
The maximum engine speed is set at 4,500 rpm to reduce frictional resistance, thereby producing a highly efficient low-speed
engine.

An offset crankshaft with 12 mm deviation from the center axis of the cylinder bore is utilized to reduce frictional resistance
of the piston.

Frictional resistance is reduced through the use of low tension valve springs and piston rings.

Lightweight design has been adopted for reciprocating engine parts.
The above measures for reducing frictional loss contribute to improved fuel economy.
3. VVT-i (Variable Valve Timing -intelligent)
The timing of the opening and closing of the intake valves is controlled by the computer according to driving conditions, such
as engine speed and level of acceleration. Thus, smooth intake and exhaust are achieved to greatly improve torque in the low
and medium speed zones. This also contributes to better fuel economy and purification of exhaust gas. Then the VVT-i function
is used to reduce vibration when the engine starts.
4. Compact, lightweight, and low emission
Adoption of an aluminum cylinder block and compact design of parts. And, by positioning the catalytic converter near the engine
for a backwards exhaust layout, we have been able to reduce emissions when the engine is cold started.
*1 : Atkinson Cycle: Proposed by an English engineer named James Atkinson, this thermal cycle enables the compression stroke
and the expansion stroke of the mechanism to be set independently of each other.
Suspension
MacPherson strut type suspension with L-shape
lower arms has been adopted in the front and
torsion beam with toe control link suspension
in the rear. Also, each component part is opti-
mally located and tuned for both excellent con-
trollability and enhanced riding comfort.
EMPS (Electric Motor-assisted Power Steering)
System
Vehicle speed sensing type electric motor-assisted power steering is fitted as standard. Unlike conventional
hydraulic power steering, EMPS does not depend on an engine for its power source, providing a steering feel
in no way inferior to conventional steering when the engine has stopped. Thus it is suitable for the HV system.
Other merits include improved fuel economy through energy conservation, lighter weight, and no need to fill
the power steering fluid.

NEW MODEL OUTLINE
MAIN EQUIPMENT
182MO20
[Information 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.
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

NEW MODEL OUTLINE
POINT1
Exterior
POINT2
Interior
POINT3
Main
Mechanism
POINT4
Main
Equipment
POINT5
Safety
7
Prius ± a 4-door compact sedan
5 Features to lead the way into
the next generation
Futuristic image and symmetry are re-
flected in the artistic design of the new
Prius.
An interior which reflects the type of
comfort that will be regarded as a must in
cars hereinafter.
Low-emission & high-fuel efficiency.
TOYOTA hybrid system leading the way
into the next generation.
A range of features for comfort - the
more you use them, the better it gets.
Prius - one step ahead of the rest even in
the area of safety.
Drive with the utmost peace of mind.

ENGINE ± 1NZ-FXE ENGINE
182EG03
N.m
120
110
100
90
80
Torque
1000 2000 3000 4000 5000
Engine Speed (rpm)kW
60
50
40
30
20
10
Output
0 44

Engine Specifications 
Engine Type1NZ-FXE1NZ-FE (ECHO)
No. of Cyls. & Arrangement4-Cylinder, In-line

Valve Mechanism16 Valve DOHC, Chain Drive

Combustion ChamberPentroof Type

ManifoldsCross-Flow

Fuel SystemSFI

Displacement cm3 (cu. in.)1497 (91.3)

Bore x Stroke mm (in.)75.0 x 84.7 (2.95 x 3.33)

Compression Ratio13.0 : 110.5 : 1
Max. Output [SAE-NET]52 kW @ 4500 rpm
70 HP @ 4500 rpm81 kW @ 6000 rpm
108 HP @ 6000 rpm
Max. Torque [SAE-NET]111 N.m @ 4200 rpm
82 lb-ft @ 4200 rpm142 N.m @ 4200 rpm
105 lb-ft @ 4200 rpm
IntakeOpen18
±25 BTDC±7
53 BTDC
Valve
IntakeClose72
115 ABDC52
±8 ABDCValve
Timing
ExhaustOpen34 BBDC42 BBDCg
ExhaustClose2 AT D C

Fuel Octane Number RON91 or more

Oil GradeAPI SJ EC or ILSAC


Performance Curve 

ENGINE ± 1NZ-FXE ENGINE45
FEATURES OF 1NZ-FXE ENGINE
The 1NZ-FXE engine has been able to achieve the following performance through the adoption of the items
listed below.
(1) High performance and fuel economy
(2) Low noise and vibration
(3) Lightweight and compact design
(4) Good serviceability
(5) Clean emission
Item
(1)(2)(3)(4)(5)1NZ-FE
The VVT-i system is used.
High-expansion Atkinson cycle has been adopted.
An offset crankshaft has been adopted.
A cylinder block made of aluminum has been adopted.
A stainless steel exhaust manifold is used for weight reduction.
A rearward exhaust layout has been adopted to realize the early
activation of the catalyst.
HC Adsorber and catalyst system has been adopted.
Fuel returnless system has been adopted.
12-hole type fuel injectors have been adopted.
The DIS (Direct Ignition System) makes ignition timing
adjustment unnecessary.
Quick connectors are used to connect the fuel hose with the
fuel pipes.
The oil filter is installed diagonally downward.
A timing chain has been adopted.
A vacuum system that detects leaks in the evaporative
emission control system has been adopted.
The vapor reducing fuel tank system has been adopted.
This system reduces the amount of fuel vapor that is generated.

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.

ENGINE ± 1NZ-FXE ENGINE
182EG38
Injector
Delivery Pipe
Pressure Regulator
Fuel Tank Fuel Filter
Fuel Pump 58
FUEL SYSTEM
1. Injector
A compact 12-hole type injector has been adopted to improve the atomization of fuel.
2. Fuel Returnless System
This system is to reduce the evaporative emission. As shown below, integrating the pressure regulator and
fuel filter with the fuel pump assembly made it possible to discontinue the return of fuel from the engine area
and prevent temperature rise inside the fuel tank.
3. Quick Connector
Quick connector has been adopted to connect the fuel pipe with the fuel hose to improve serviceability.

ENGINE ± 1NZ-FXE ENGINE62
ENGINE CONTROL SYSTEM
1. General
The engine control system for the 1NZ-FXE engine has following system.
System
Outline
SFI
Sequential Multiport
Fuel InjectionAn L-type SFI system directly detects the intake air volume with a hot-wire
type mass air flow meter.
ESA
Electronic Spark
AdvanceIgnition timing is determined by the ECM based on signals from various
sensors. The ECM corrects ignition timing in response to engine knocking.
VVT-i
Variable Valve
Timing-intelligentControls the intake camshaft to an optimal valve timing in accordance with
the engine condition.
ETCS-i
Electronic
Throttle Control
System-intelligentOptimally controls the throttle valve opening in accordance with the ECM,
and the conditions of the engine and the vehicle, and comprehensively
controls the ISC and cruise control system.
Fuel Pump Control
Fuel pump operation is controlled by signal from the ECM.

To stop the fuel pump during operation of the SRS airbag.
Oxygen Sensor Heater
ControlMaintains the temperature of the oxygen sensors at an appropriate level to
increase accuracy of detection of the oxygen concentration in the exhaust gas.
Evaporative Emission
Control

The ECM controls the purge flow of evaporative emissions (HC) in the
charcoal canister in accordance with engine conditions.

Using 3 VSVs and a vapor pressure sensor, the ECM detects any
evaporative emission leakage occurring between the fuel tank and the
charcoal canister, and vapor reducing fuel tank through the changes in the
tank pressure. For details, see page 79.
Toyota HCAC System
The ECM controls the VSV (for Toyota HCAC System) to improve the clean
emission performance of the exhaust gas when the temperature of the TWC
is low. For details, see page 58.
Air Conditioning
Cut-Off ControlBy turning the air conditioning compressor OFF in accordance with the
engine condition, drivability is maintained.
Cooling Fan ControlRadiator cooling fan operation is controlled by signals from ECM based on
the engine coolant temperature sensor signal (THW).
HV Immobiliser
Prohibits fuel delivery, ignition, and starting the HV system if an attempt is
made to start the HV system with an invalid ignition key. For details, see page
80.
DiagnosisWhen the ECM detects a malfunction, the ECM diagnoses and memorizes
the failed section.
Fail-SafeWhen the ECM detects a malfunction, the ECM stops or controls the engine
according to the data already stored in memory.

ENGINE ± 1NZ-FXE ENGINE
182EG24
VVT-i Controller
ECM
Camshaft Position
Sensor
Camshaft Timing
Oil Control Valve Crankshaft
Position
Sensor67
5. Main Components of Engine Control System
The main components of the 1NZ-FXE engine control system are as follows:
Components
OutlineQuantity
Mass Air Flow MeterHot-Wire Type1
Crankshaft Position Sensor (Rotor's Teeth)Pick-Up Coil Type (36-2)1
Camshaft Position Sensor (Rotor's Teeth)Pick-Up Coil Type (3)1
Throttle Position SensorLinear Type (Double)1
Knock SensorBuilt-In Piezoelectric Element Type1
Oxygen Sensor
Heated Oxygen Sensor
(Bank 1, Sensor 1)
(Bank 1, Sensor 2)
2
Injector12-Hole Type4
6. VVT-i (Variable Valve Timing-intelligent) System
General
The VVT-i system is designed to control the intake camshaft within a wide range of 43 (of crankshaft
angle) to provide a valve timing that is optimally suited to the engine condition, thus realizing improved
torque in all the speed ranges and fuel economy, and reduce exhaust emissions.