TOYOTA CAMRY 2000 Service Repair Manual

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
150NF103 150NF102'98 Camry '97 Camry
A ± A' Cross Section
150IN101
Windshield
GlassWindshield
Moulding
Windshield
GlassWindshield
Moulding AA' 14
BODY
1. Low Vibration Low Noise Body
The front door window glass has been increased in thickness from 4.0mm (0.16 in.) to 5.0mm (0.20 in.)
to reduce the amount of noise transmitted from the outside of the vehicle.
The cross section shape of the outside windshield moulding has been changed to direct the airflow smooth-
ly from the front to the side of the vehicle. As a result, the wind noise has been reduced.

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
150NF107 150NF106150NF108Inactive Activated End Shaft (Fix) Spool
Seat BeltForce
Limiter
Plate
Shaft (Fix)Contact
16
3. Seat Belt Force Limiter
Construction and Operation
Seat belt force limiter consists of the force limiter plate, spool, shaft and etc.
When a further movement of the occupant applies a force that exceeds the specified load, the force limiter
plate begins to deform, and the spool rotates along with the movement of the belt allowing the belt to be
pulled out. At this time, the force limiter plate deforms as if wrapping around the shaft along with the rota-
tion of the spool, and acts as a resistance force against the pullling of the belt.
When the spool makes 1-1 / 4 turns, the plate makes one complete turn around the shaft. As the plates them-
selves come in contact, the spool will not be able to rotate further. As a result, the force limiter completes
its activation.

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.

CAMRY ± NEW FEATURES
150NF122
Pressure BulkheadPropellant Grain
Gas
Initiator
CAUTION
The initiator is ignited even by a feeble current. As it is dangerous, never measure the resistance of the
initiator with a volt / ohmmeter, etc.
150NF123
Pressure Bulkhead
Propellant GrainInitiator
Gas
: Propagation of Fire
: Flow of Gas
20
Inflator and Bag
1) Construction
The inflator and bag are integrated inside the case and located in the outer side of the seat back. The infla-
tor is comprised of a initiator, propellant grain, gas and pressure bulkhead.
The bag is made of strong nylon cloth and becomes inflated by the gas heated by the inflator.
2) Operation
When the side airbag sensor detects the acceleration because of a side collision, the ECU appraises the
extent of the acceleration to determine whether or not the side airbag must be deployed.
After the ECU determines that the side airbag must be delpoyed, it causes the initiator to ignite in order
to head and expand the gas inside the inflator. The expanded gas tears thhe pressure bulkhead and flows
into the bag.
The bag, which is inflated by the gas, pushes open the case in the seat, tears the sewn portion of the seat
outer cover, and expands to the side of the occupant.
The expanded bag receives the occupant's arm and chest, and discharges the gas through the bag's surface
in order to soften the rcoil.
Thus, the side airbag helps to reduce the impact energy that is applied to the occupant's arm and chest
areas.

CAMRY ± NEW FEATURES
150NF113
SRS Warning Light
150NF114
Range of Operation
Safing
Sensor ON
Side Airbag
Sensor ON
ANDIgnition
21
SRS Warning Light
The
SRS warning light is located on the
combination meter.
It comes on to alert the driver about system
trouble when a malfunction is detected in
self-diagnosis of the airbag sensor assembly and
side airbag sensor assembly. In normal operating
conditions when the ignition switch is turned to
the ACC or ON position, the light comes on for
about 6 seconds and then goes off.
5. System Operation
Ignition Judgement and Conditions
The safing sensor is designed to be activated by a smaller acceleration rate than the side airbag sensor.
As illustrated below, ignition is caused when current flows to the initiator, which happens when a safing
sensor and the side airbag sensor go on simultaneously.