2000 TOYOTA CAMRY O2 sensor

CAMRY ± NEW FEATURES
149EG07
Clamp
Fuel Hose
Fuel Filter 10
Fuel Filter
A quick connector is used to connect the fuel fil-
ter and the fuel hose together to improve seri-
viceability.
6. Engine Control System
General
The California specification automatic transaxle model has adopted an air-fuel sensor. All models are avail-
able with the Engine Immobiliser System as an optional equipment. The models other than the California
specification automatic transaxle model are basically the same as the '97 models except for the adoption
of the Engine Immobiliser System.
SFI (Sequential Multiport Fuel Injection)
The precision of the air-fuel ratio feedback control has been improved through the adoption of the air-fuel
ratio sensor. The operation of the air-fuel ratio sensor and the ECM are the same as those of the California
specification model with the 5S-FE engine and automatic transaxle. For details, see the '97 Camry New Car
Features (Pub. No. NCF134U).
Engine Immobiliser System
The engine immobiliser system has been designed to prevent the vehicle from being stolen. This system
uses an ECM that stores the ID code of the authorized ignition key. If an attempt is made to start the engine
using an unauthorized key, the ECM prohibits fuel delivery and ignition effectively disabling the engine.
For details, see page 23 in the Engine Immobiliser system section.

CAMRY ± NEW FEATURES
No.2 INJECTOR
SENSORS ACTUATORS
VG
RSO IGF NE
ECM
IGTI

IGT3
#10
G22
THW
THA
VTA1
STA
SPD
AFR
AFL
OXS
EGLS
THG
KNKR
CF
NSW
A/C
ACIS
FC
ACT
MAFR
HAFL
HREL
#20
#30
#40
#50
#60
MASS AIR FLOW METER
R, 2, L KNKLIGSW
RSC
CRANKSHAFT POSITION SENSOR
Engine Speed Signal
Crankshaft Angle Signal
CAMSHAFT POSITION SENSOR
Crankshaft Angle Signal
ENGINE COOLANT TEMP.
SENSOR
INTAKE AIR TEMP. SENSOR
THROTTLE POSITION SENSOR
Throttle Position Signal
IGNITION SWITCH
Starting Signal
Ignition Signal
VEHICLE SPEED SENSOR
COMBINATION METER
AIR-FUEL RATIO SENSOR
(Bank 1, Sensor 1)
AIR-FUEL RATIO SENSOR
(Bank 2, Sensor 1)
HEATED OXYGEN SENSOR
(Bank 1, Sensor 2)
EGR VALVE POSITION SENSOR
EGR GAS TEMP. SENSOR
KNOCK SENSORS
PARK / NEUTRAL POSITION
SWITCH
Neutral Start Signal
AIR CONDITIONING AMPLIFIER
A / C Switch Signal
COOLING FAN RELAYNo.1 INJECTOR
No.3 INJECTOR
No.4 INJECTOR
No.5 INJECTOR
No.6 INJECTOR
ESA
IGNITER
IGNITION COILS
SPARK PLUGS
IAC
CONTROL VALVE
ACIS
VSV
FUEL PUMP CONTROL
CIRCUIT OPENING RELAY
AIR CONDITIONING CONTROL
AIR CONDITIONING
AMPLIFIER
AIR FUEL RATIO SENSOR
HEATER CONTROL
AIR FUEL RATIO SENSOR
HEATER RELAY
AIR FUEL RATIO SENSOR
HEATER (Bank 1, Sensor 1)
AIR FUEL RATIO SENSOR
HEATER (Bank 1, Sensor 2)SFI
(Continued)
KNOCK SENSORS
11
Construction
1) California Specification Automatic Transaxle Model
The configuration of the engine control system in the 1MZ-FE engine of the '98 Camry is as shown in
the following chart. Shaded portions
differ from the 1MZ-FE engine of the '97 Camry.

CAMRY ± NEW FEATURES
BATT
BATTERY
PS
IMLD
EGR
EVP1
TPC
W
ELS
STP
PTNK
TRC
TXCT
KSW
TC
SIL
EFI MAIN RELAY
+B
EFI ELS2 POWER STEERING OIL
PRESSURE SWITCH
TAILLIGHT & REAR WINDOW
DEFOGGER
STOP LIGHT SWITCH
VAPOR PRESSURE SENSOR
ABS & TRAC ECU*
1
TRANSPONDER KEY
AMPLIFIER*2
UNLOCK WARNING SWITCH*2
DATALINK CONNECTOR 1
DATALINK CONNECTOR 3EGR CONTROL
VSV
EVAP CONTROL
VSV
VAPOR PRESSURE CONTROL
VSV
THEFT DETERRENT INDICATOR
LIGHT*2
MALFUNCTION INDICATOR
LAMP
HTSOXYGEN SENSOR HEATER
CONTROL
HEATED OXYGEN SENSOR
HEATER (Bank 1, Sensor 2)
RXCK
CODE
12
*1: Applicable only to vehicles equipped with the TRAC System.
*
2: Applicable only to vehicles equipped with the Engine Immobiliser System.

CAMRY ± NEW FEATURES
150EG01
Circuit Opening RelayIgnition
SwitchEFI
Main
Relay
DLC1 Pressure
RegulatorVehicle Speed
SensorPark / Neutral Position Switch*
Fuel Pump
BatteryMIL
Air
Conditioning
Amplifier
DLC3
Stop Light Switch
Electrical Load Switch
Air-Fuel Ratio Sensor Heater Relay
ECM Fuel
Filter
Pulsation
DamperVSV
(for EVAP)Vapor
Pressure
Sensor
VSV
for Vapor
Pressure
Sensor
Charcoal CanisterVCV
Intake Air Temp.
SensorIAC Valve
VSV (for EGR)
Mass Air Flow
Meter
Air-Fuel Ratio Sensor
(Bank 1, Sensor 1)Throttle
Position
Sensor
Actuator
DIS
Injector
VSV (for ACIS)
EGR
Valve
Position
Sensor
EGR
Valve EGR Gas
Temp. Sensor Camshaft
Position
Sensor
Engine Coolant
Temp. SensorWU-TWC
WU-TWC
Crankshaft
Position SensorKnock Sensors
Air-Fuel Ratio Sensor
(Bank 2, Sensor 1)Heated Oxygen Sensor
(Bank 1, Sensor 2)
13
Engine Control System Diagram
1) California Specification Automatic Transaxle Model
*: Only for the Automatic Transaxle Models

CAMRY ± NEW FEATURES
150NF105 150NF104Inactive Activated Wire
PulleyDrum
Piston
Cylinder
15
SEAT BELT
1. General
The front seats are provided with an electrical sensing type seat belt pretensioner and a seat belt force limiter.
In the beginning of a collision, the seat belt pretensioner instantly pulls up the seat belt thus providing the
excellent belt's effectiveness in restraining the occupant.
When the impact of a collision causes the tension of the seat belt applied to the occupant to reach a predeter-
mined level, the force limiter restrains the tension, thus controlling the force applied to the occupant's chest
area.
In accordance with the ignition signal from the airbag sensor assembly, the seat belt pretensioner activates
simultaneously with the deployment of the
SRS airbags for the driver and front passenger.
2. Seat Belt Pretensioner
Construction and Operation
The seat belt pretensioner consists of the pretensioner mechanism and retracting mechanism.
The pretensioner mechanism consists of a gas generator, piston, wire, drum and etc.
If the airbag sensor is turned on by deceleration due to frontal collision, electric current then ignites the gas
generator located in the pretensioner. As a result, the gas generator emits gas in an extremely short time and
pushes the piston. Since the cable is attached to the piston, the piston will pull on the cable causing the drum
to grab onto the shaft. The shaft will then move in the retracting direction pulling up the belt for a predeter-
mined length.

CAMRY ± NEW FEATURES
150NF109
150NF110
Side Collision ImpactLeft Side Airbag
Sensor Assembly
Power
Source
Safing
Sensor
Side Airbag
SensorInitiator
Bag
(For Driver) Gas
Inflator
Airbag Sensor
AssemblyCPU
Drive
Circuit
17
SRS SIDE AIRBAG
1. General
In conjunction with the energy absorbing doors, the SRS side airbags have been designed to help reducing
the impact energy that is transmitted to the driver and front passenger in the event of a side collision. In
a side collision, the side airbag sensor detects the shock and if the side-to-side shock is greater that a speci-
fied value, the airbags stored in the seat back for the driver and the front passenger inflate instantly to help
reducing the likelihood of the driver's or front passenger's arm and chest directly hitting the door trim.
Each
SRS side airbag is independent of the other.
An electrical type
SRS side airbag, in which the side airbag is activated by the ignition signal emitted by
the airbag sensor assembly, has been adopted.

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

CAMRY ± NEW FEATURES
150NF111
SRS Warning
LightAirbag Sensor
AssemblyRight Side Airbag
Assembly
Right Side Airbag
Sensor Assembly
Left Side Airbag
Sensor Assembly Left Side
Airbag Assembly
150NF112
BatterySide Airbag Sensor
Assembly (LH)
Initiator
(LH)
Back-Up
Power Source
DC-DC
Converter
CPU
Airbag Sensor AssemblyInitiator
(RH) Side Airbag Sensor
Assembly (RH)
SRS Warning Light
Drive
Circuit
Communication
Circuit
Drive
CircuitSafing
Sensor
Drive
Circuit
Drive
Circuit
DLC1
Power
Control
Ignition Switch
Communication
Circuit
Power
Control
18
2. Layout of Components
The major function parts of the side airbag system are shown below.
3. Wiring Diagram

CAMRY ± NEW FEATURES19
4. Construction and Operation
Side Airbag Sensor Assembly
1) Description
The side airbag sensor assembly is mounted on the right and left center pillars. It receives signals from
the side airbag sensor enclosed in the side airbag sensor assembly and judges whether the side airbag must
be activated or not.
2) Construction and Operation
The side airbag sensor assembly consists of side airbag sensor, safing sensor, etc.
a. Side Airbag Sensor
The side airbag sensor is enclosed in the side airbag sensor assembly based on the acceleration of the
vehicle that occurs during a side collision. The distortion created in the sensor is converted into an elec-
tric signal. This signal is a linear representation of the acceleration rate.
b. Safing Sensor
The safing sensor is enclosed in the side airbag sensor assembly. The sensor turns ON if an acceleration
force that is higher than a predetermined value is applied to the safing sensor as a result of a side colli-
sion.
Airbag Sensor Assembly
1) Description
The airbag sensor assembly is mounted on the center floor under the instrument panel.
When the airbag sensor assembly receives the airbag activation signal from the side airbag sensor assem-
bly, it applies current to the inflator.
Furthermore, the airbag sensor assembly diagnoses a system malfunction of the side airbag system.
This is the same airbag sensor assembly that is used for the
SRS airbag for the driver and front passenger.
2) Construction and Operation
The airbag sensor assembly consists of ignition control circuit, back up power source, diagnosis circuit,
memory circuit, etc.
a. Ignition Control Circuit
The ignition control circuit performs a prescribed calculation based on the signal output by the airbag
sensor and the front airbag sensor. If these calculated values are larger than a predetermined value, it
activates the ignition operation.
b. Back-Up Power Source
The back-up power source consists of a back-up capacitor and a DC-DC converter. In case of a power
system failure during a collision, the back-up capacitor discharges and supplies electric power to the
system. The DC-DC converter is a boosting transformer when the battery voltage drops below a certain
level.
c. Diagnosis Circuit
This circuit constantly diagnoses the system for any malfunction. When a malfunction is detected, it
lights up the
SRS warning light on the combination meter to alert the driver.
d. Memory Circuit
When a malfunction is detected by the diagnosis circuit, it is coded and stored in this memory circuit.