2001 TOYOTA PRIUS catalytic converter

dashboard traction control cabin filter engine overheat ad blue bolt pattern

Page 271 of 1943

TOYOTA PRIUS 2001 Service Repair Manual NEW MODEL OUTLINE
MAIN MECHANISM
12
Low-emission & high-fuel efficiency.
TOYOTA hybrid system leading the way into the next
generation.
Tackling the challenge for high fuel efficiency and
low emission

NEW MODEL OUTLINE
MAIN MECHANISM
12
Low-emission & high-fuel efficiency.
TOYOTA hybrid system leading the way into the next
generation.
Tackling the challenge for high fuel efficiency and
low emissions
Prius - the mass-production gasoline hybrid vehicle - already meets all of the various strict emission levels
being proposed throughout the world, well ahead of the competition. What's more, through the use of the
hybrid system, surpassing fuel efficiency and a massive reduction in CO
2 has become a reality. The Prius
can truly be acclaimed as ªthe clean and environmentally friendly vehicle.º
Emission Reduction Features
1. Precision Emission Control
Through full utilization of the two Oxygen sensors, precision emission control is made possible even when
the engine is frequently stopped and re±started. Furthermore, excellent purification of exhaust gas is ensured
through the catalytic converter, resulting in reduced emissions.
2. Vapor Reducing Fuel Tank System
We have developed a new fuel tank system that can dramatically reduce the amount of fuel vapor generated
in the tank both when the vehicle is moving as well as when it is at a standstill. This system is the first one
in the world to be used.
3. TOYOTA HC Adsorber and Catalyst System
A new system has been adopted which adsorbs the HC that is emmitted between the time the engine is cold-
started and the catalytic converter is still cool and not yet activated, until the time the catalytic converter be-
comes active.
After the catalytic converter has been activated, the HC disassociates little by little and is then purified.
4. Adoption of a Thin-walled High-density Cell Catalytic Converter
In order to reduce the amount of time taken until the catalytic converter is activated, we developed a catalytic
chamber with a super thin ceramic wall. Also, high-density cells have been utilized as a measure to improve
strength and increase contact area with exhaust gas. Through these measures we have been able to achieve
a balance of reliability and purification efficiency.

Page 275 of 1943

TOYOTA PRIUS 2001 Service Repair Manual 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 wi

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.

Page 297 of 1943

TOYOTA PRIUS 2001 Service Repair Manual ENGINE ± 1NZ-FXE ENGINE
182EG14
182EG15
Ball Joints
Main Mufflar
TWC
TWC with HC Adsorber
182EG16
Actuator
HC Adsorber
Bypass Valve
TWC 56
3. Exhaust Manifold
A ball joint has been adopted for coupl

Page 481 of 1943

TOYOTA PRIUS 2001 Service Repair Manual IN±28
± INTRODUCTIONFOR ALL OF VEHICLES
28 Author: Date:
2001 PRIUS (RM778U)
8. FOR VEHICLES EQUIPPED WITH A CATALYTIC CONVERTER
CAUTION:
If large amount of unburned gasoline flows into the conv

IN±28
± INTRODUCTIONFOR ALL OF VEHICLES
28 Author: Date:
2001 PRIUS (RM778U)
8. FOR VEHICLES EQUIPPED WITH A CATALYTIC CONVERTER
CAUTION:
If large amount of unburned gasoline flows into the converter, it may overheat and create a fire haz-
ard. To prevent this, observe the following precautions and explain them to your customer.
(a) Use only unleaded gasoline.
(b) Avoid prolonged idling.
Avoid running the engine at idle speed for more than 20 minutes.
(c) Avoid spark jump test.
(1) Perform spark jump test only when absolutely necessary. Perform this test as rapidly as possible.
(2) While testing, never race the engine.
(d) Avoid prolonged engine compression measurement.
Engine compression tests must be done as rapidly as possible.
(e) Do not run engine when fuel tank is nearly empty.
This may cause the engine to misfire and create an extra load on the converter.
(f) Avoid coasting with ignition turned off.
(g) Do not dispose of used catalyst along with parts contaminated with gasoline or oil.
9. IF VEHICLE IS EQUIPPED WITH MOBILE COMMUNICATION SYSTEM
For vehicles with mobile communication systems such as two±way radios and cellular telephones, observe
the following precautions.
(1) Install the antenna as far as possible away from the ECU and sensors of the vehicle's electronic
system.
(2) Install the antenna feeder at least 20 cm (7.87 in.) away from the ECU and sensors of the ve-
hicle's electronic systems. For details about ECU and sensors locations, refer to the section on
the applicable component.
(3) Avoid winding the antenna feeder together with other wiring as much as possible, and also avoid
running the antenna feeder parallel with other wire harnesses.
(4) Check that the antenna and feeder are correctly adjusted.
(5) Do not install powerful mobile communications system.
10. FOR USING OBD II SCAN TOOL OR TOYOTA HAND±HELD TESTER
CAUTION:
Observe the following items for safety reasons:
Before using the OBD II scan tool or TOYOTA hand±held tester, the OBD II scan tool's instruc-
tion book or TOYOTA hand±held tester's operator manual should be read thoroughly.
Be sure to route all cables securely when driving with the OBD II scan tool or TOYOTA hand±
held tester connected to the vehicle. (i.e. Keep cables away from feet, pedals, steering wheel
and shift lever.)
Two persons are required when test driving with the OBD II scan tool or TOYOTA hand±held
tester, one person to drive the vehicle and the other person to operate the OBD II scan tool or
TOYOTA hand±held tester.

Page 499 of 1943

TOYOTA PRIUS 2001 Service Repair Manual IN04Q±11
IN±46
± INTRODUCTIONTERMS
46 Author: Date:
2001 PRIUS (RM778U)
TERMS
ABBREVIATIONS USED IN THIS MANUAL
AbbreviationsMeaning
ABSAnti±Lock Brake System
ACAlternating Current
ACCAccessor

Page 505 of 1943

TOYOTA PRIUS 2001 Service Repair Manual IN±52
± INTRODUCTIONTERMS
2001 PRIUS (RM778U) HO2S
Heated Oxygen SensorHeated Oxygen Sensor (HO2S)
IACIdle Air ControlIdle Speed Control (ISC)
IATIntake Air TemperatureIntake or Inlet Air Temperat

Page 506 of 1943

TOYOTA PRIUS 2001 Service Repair Manual ± INTRODUCTIONTERMS
IN±53
2001 PRIUS (RM778U) TCM
Transmission Control ModuleTransmission ECU, ECT ECU
TPThrottle PositionThrottle Position
TRTransmission Range±
TVVThermal Vacuum ValveBimetallic

Page 624 of 1943

TOYOTA PRIUS 2001 Service Repair Manual DI±16
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)P0340
(DI±76)
Camshaft Position Sensor Cir-
cuit Malfunction
Open or short in camshaft position sensor circuit
Camshaft position sensor
Camshaft t

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