2000 TOYOTA CAMRY O2 sensor

111 BODY ELECTRICALÐACCESSORIES
 SRS AIRBAG
1. General
The SRS (Supplemental Restraint System) airbag is designed to help lessening the shock to the driver and front
passenger as a supplement to the seat belt. In a collision, the aribag sensor detects the shock and if the front±to±rear
shock is greater than a specified value, the airbags stored in the steering wheel pad for the driver and above the glove
box for the front passenger inflate instantly to help reducing the likelihood of the driver's or front passenger's head
and chest directly hitting the steering wheel or instrument panel.
As in the '96 Avalon, a 1±sensor type airbag system is used, in chich the detection of deceleration during a collision
is accomplished by the airbag sensor enclosed in the airbag snesor assembly.
The airbag system is controlled by the airbag sensor assembly. It has a self±diagnosis function. When it detects a
system malfunction, it lights up the SRS warning light on the combination meter to alert the driver.
The basic construction and operation are the same as in teh '96 Avalon. However, 2 types of the inflator for front
passenger have been adopted in the new Camry: TRW made and Morton made. Also, the construction of airbag sensor
assembly has been changed.

System Diagram
The activation processes of the SRS airbag is as illustrated below.

113 BODY ELECTRICALÐACCESSORIES
4. construction and Operation
Inflator and Bag for Front Passenger
1) General
The inflator and ag for front passenger are inserted inside the case, and located in the passenger side instrument panel.
the bag is made of strong nylon cloth, and becomes inflated by the argon gas flowed from the inflator. Also, 2 types
of the inflator for front passenger have been adopted: TRW made and Morton made.
2) Inflator of TRW Made
The inflator of TRW made is comprised of a squib, propellant grain, burst cup and high pressure argon gas.
If the airbag sensor is turned on by deceleration due to frontal collision, electric current then ignites the squib located
in the inflator. the frame of squib spreads instaneously to the propellant grain. If the internal pressure of the burst cup
increases by the combustion of the propellant grain, the burst cup will be released by making its bulkhead break. With
this, the gas which expanded by the tgeat of the ignition of the propellant grain flows into the airbag via the diffuser,
thus inflating the airbag.

Construction

114BODY ELECTRICALÐACCESSORIES

Operation
3) Inflator of Morton Made
The inflator of Morton made is comprised of a squib, projectile, orifice disk, propellant grain, hight pressure argon
gas and etc.
If the airbag sensor is turned on by deceleration due to frntal collision, electric current then ignites the squib located
in the inflator. The projectile which fired by the ignition of the squib pierces through the orifice disk and collides with
the action piston, which causes the primer to ignite. The flame wo the primer spreads instantaneously to the ignition
booser and to the propellant grain. The gas which expanded by the heat of the ignition of the propellant grain flows
into the airbag via the gas release hole, thus inflating the airbag.

Airbag Sensor Assembly Steering Wheel PadFront Passenger Airbag Assembly Spiral Cable
HANDLING PRECAUTIONS ON RELATED COMPONENTS
1. SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Locations of SRS Components
Servicing vehicle with a Supplemental Restraint System (referred to as the SRS in the remainder of this
manual) installed.
When handling SRS components (removal, installation or inspection, etc.), always follow the directions
given in the repair manual for the relevant model year to prevent the occurrence of accidents and airbag
malfunction.
Also take the following precautions when repairing the body:

Work must be started after 90 seconds or longer from the time the ignition switch is set to the LOCK
position and the negative (±) terminal cable is disconnected from the battery.
(The airbag system is equipped with a back±up power source so that if work is started within 90 sec-
onds of disconnecting the negative (±) terminal cable of the battery, the airbag may be deployed.)
When the negative (±) terminal cable is disconnected from the battery, memory of the clock and audio
systems will be cancelled. So before starting work, make a record of the contents memorized by each
memory system. Then when work is finished, reset the clock and audio systems as before.
When the vehicle has tilt and telescopic steering, power seat, outside rear view mirror and power shoul-
der belt anchorage, which are all equipped with memory function, it is not possible to make a record of
the memory contents. So when the operation is finished, it will be necessary to explain this fact to the
customer, and request the customer to adjust the features and reset the memory.

When using electric welding, first disconnect the SRS connector (yellow color and 2 pins) under the
steering column near the combination switch connector on the glove compartment finish plate and
lower the front scuff plate before starting work.
INTRODUCTIONIN-6

Component to be alignedSection of repair manual
for relevant model year
Front Wheels
Suspension and Axle (SA) section
Rear Wheels
Suspension and Axle (SA) section

Before repairing the body, remove the SRS parts if, during repair, shocks are likely to be applied to
the sensors due to vibrations of the body or direct tapping with tools or other parts.

Do not expose the SRS parts directly to hot air or flames
NOTICE:
1) The maximum ambient temperature tolerance is 120
°C (248°F) for the front airbag sensor,
105
°C (221°F) for the center airbag sensor assembly and 93°C (200°F) for the steering wheel
pad, and front passenger airbag assembly. If it is possible that the ambient temperature may
reach or exceed the temperature limit, remove the sensors and the steering wheel pad from the
vehicle or protect them with a hot insulation material before staring work.
2) Prior to welding, remove adjacent, SRS parts form tire vehicle or protect them with fire±proof
covers.

If the vehicle is damaged, visually inspect for damage to the steering wheel pad using the inspection
procedures described in section RS of the repair manual for the relevant model year.

When removing or handling the steering wheel pad, and front passenger airbag assembly keep the
pad upper surface facing upward. Also, lock the lock lever of the twin lock type connector at the rear
of the pad and take care not to damage the connector.
(Storing the pad or front passenger airbag assembly with its metallic surface up may lead to a seri-
ous accident if the airbag inflates for some reason.)

Store the steering wheel pad and the front passenger airbag assembly where the ambient tempera-
ture remains below 93°C (200°F), without high humidity and away from electrical noise.

Be careful not to let painting materials contact the SRS parts.

Information labels are attached to the periphery of the SRS components. Follow the NOTICES.

Store the airbag assembly where the ambient temperature remains below 93°C (200°F), without
high humidity and away from electrical noise.
2. BRAKE SYSTEM
The brake system is one of the most important safety components. Always follow the directions and
notes given in section BR of the repair manual for the relevant model year when handling brake sys-
tem parts.
NOTICE: When repairing the brake master cylinder or TRAC system, bleed the air out of the TRAC
system.
3. DRIVE TRAIN AND CHASSIS
The drive train and chassis are components that can have great effects on the running performance
and vibration resistance of the vehicle. After installing components in the sections listed in the table
below, perform alignments to ensure correct mounting angles and dimensions. Particularly accurate
repair of the body must also be done to ensure correct alignment.
HINT: Correct procedures and special tools are required for alignment. Always follow the directions
given in the repair manual for the relevant model year during alignment and section DI of this manual.
INTRODUCTIONIN-7

CAMRY ± OUTLINE OF NEW FEATURES
CAMRY
2
OUTLINE OF NEW FEATURES
The Camry is a high-quality family sedan with advanced technology and sporty performance. The following
changes are made for the 1998 model year.
1. Model Line-Up
The SXV20L-AEPNKK and MCV20L-A (C) EPGKK models have been added.
The MCV20L-CEPNKK model has been discontinued.
2. Interior Equipment
An extensible assist grip has been newly provided for the front passenger.
3. 5S-FE Engine
ORVR (On-Board Refueling Vapor Recovery) System has been adopted.
4. 1MZ-FE Engine
The 1MZ-FE engine with automatic transaxle on the California specification model uses the air-fuel ratio
sensor and the WU-TWC (Warm Up-Three-Way Catalytic Converters) to reduce exhaust emissions.
5. Body
The cross section shape of the outside windshield moulding has been changed to reduce the wind noise.
The front door window glass has been increased in thickness to reduce the amount of noise transmitted
from the outside of the vehicle.
Front seat belt with pretensioner and force limiter has been adopted.
6. Engine Immobiliser System
An engine immobiliser system has been newly provided to help improve the vehicle's theft prevention perfor-
mance.
7. Theft Deterrent System
The starter cutoff function has been discontinued along with the adoption of the engine immobiliser sys-
tem.
The illumination pattern of the indicator light which indicates the condition of the system has been
changed.

CAMRY ± NEW FEATURES7
1MZ-FE ENGINE
1. Description
On the California specification automatic transaxle model, the 1MZ-FE engine has adopted the air-fuel ratio
sensor and the WU-TWC (Warm Up-Three-Way Catalytic Converter) to reduce exhaust emissions.
2. Engine Specifications
1MZ-FE Engine
Item'98 Model'97 Model
No. of Cyls. & Arrangement6-Cylinder, V Type
Valve Mechanism24-Valve, DOHC,
Belt & Gear Drive
Combustion ChamberPentroof Type
ManifoldsCross-Flow
Fuel SystemSFI
Displacement cm3 (cu. in.)2995 (182.7)
Bore x Stroke mm (in.)87.5 x 83.0 (3.44 x 3.27)
Compression Ratio10.5 : 1
Max. Output [SAE-NET]
145 kW@5200 rpm
(194HP@5200 rpm),
143 kW@5200 rpm
(192 HP@5200 rpm)*
145 kW@5200 rpm
(194HP@5200 rpm)
Max. Torque [SAE-NET]
283 N.m@4400 rpm
(209 ft
.lbf@4400 rpm),
281 N
.m@4400 rpm
(207 ft
.lbf@4400 rpm)*
283 N.m@4400 rpm
(209 ft
.lbf@4400 rpm)
IntakeOpen4 BTDC
Valve
IntakeClose44 ABDCValve
Timing
ExhaustOpen46 BBDCg
ExhaustClose2 AT D C
Fuel Octane Number RON91 or Higher
Oil GradeAPI SH EC-II,
SJ EC or ILSACAPI SH EC II or ILSAC
Premium unleaded gasoline (96RON) is used for the above specifications.
*: California Specification Automatic Transaxle Model.

CAMRY ± NEW FEATURES
150EG07 150EG06
Right Bank
Exhaust Manifold
WU-TWCLeft Bank
Exhaust Manifold
Exhaust Manifold
Cross-SectionOuter Pipe
Inner Pipe 8
3. Major Differences
The following changes have made to the 1MZ-FE engine.
Item
Details
Intake and Exhaust
System*
1
The exhaust manifolds adopt a double-wall construction consisting of
stainless steel pipes to improve the warm-up performance of the TWC.
WU-TWCs*
2 have been adopted to reduce exhaust emissions soon after
the engine is started.
Fuel System
4-hole type fuel injectors have been adopted to improve the atomization
of fuel.*
1
A quick connector is used to connect the fuel filter and the fuel hose
together to improve serviceability.
Engine Control
SystemAir-fuel ratio sensors have been adopted to improve the precision of the
air-fuel ratio feedback control.*
1
The engine immobiliser system has been integrated with the ECM.*3
*1: Only for California Specification Automatic Transaxle Model.
*
2: WU-TWC (Warm Up-Three-Way Catalytic Converter)
*
3: Applicable only to vehicle equipped with the Engine Immobiliser System.
4. Intake and Exhaust System (California Specification Automatic Transaxle Model)
Exhaust Manifold
The exhaust manifolds have been changed from the previous 3-layer type, in which ceramic wool is sand-
wiched, to the double-wall construction consisting of stainless steel pipes. As a result, the warm-up per-
formance of the TWC has been improved.
The left bank exhaust manifold integrates with a WU-TWC.