2000 TOYOTA CAMRY ignition

48ENGINEÐ1MZ±FE ENGINE

ENGINE CONTROL SYSTEM
1. General
The engine control system of the new 1MZ±FE engine is basically the same in construction and operation as that of
the previous 1MZ±FE engine. However, the fuel pressure control has been discontinued and the EGR control system
has been changed.
The engine control system of the new 1MZ±FE engine and previous 1MZ±FE engine are compared below.
System
OutlineNewPrevious
SFI
(SequentialA L±type SFI system directly detects intake air mass with
a hot wire type mass air flow meter.(q
Multiport Fuel
Injection)The fuel injection system is a sequential multiport fuel
injection system.
ESA
Ignition Timing is determined by the ECM based on
signals from various sensors. The ECM corrects ignition
timing in response to engine knocking.

(Electronic Spark2 knock sensors are used to improve knock detection.(p
Advance)In vehicles equipped with automatic transaxle, torque
control correction during gear shifting has been used to
minimize the shift shock.

IACA rotary solenoid type IAC valve controls the fast idle(Idle Air Control)
A rotary solenoid type IAC valve controls the fast idle
and idle speeds.
ACIS
(Acoustic Control
The intake air passages are switched according to the en-
gine speed and throttle valve angle to increase perfor(Acoustic Control
Induction System)
gine speed and throttle valve angle to increase perfor-
mance in all speed ranges.
Fuel Pressure
ControlIn hot engine conditions, the fuel pressure is increased to
improve restartability.
Oxygen Sensor
Heater ControlMaintains the temperature of the oxygen sensor at an
approppiate level to increase accuracy of detection of
the oxygen concentration in the exhaust gas.

EGR Cut±Off
ControlCuts off EGR according to the engine condition to
maintain drivability of the vehicle and durability of
EGR components.
Ð
EGR Control
Uses the duty control type VSV and EGR valve position
sensor, controlling the EGR volumne in accordance with
engine conditions.
Ð
Evaporative
Emission ControlThe ECM controls the purge flow of evaporative emis-
sions (HC) in the charcoal canister in accordance with
engine conditions.

Diagnosis
When the ECM detects a malfunction, the ECM diagnoses
and memorizes the failed section.
DiagnosisThe diagnosis system includes a function that detects a
malfunction in the evaporative control system.Ð
Fail SafeWhen the ECM detects a malfunction, the ECM stops
or controls the engine according to the data already stored
in memory


73 CHASSISÐBRAKES
6. Construction and Operation of Components
TRAC OFF Switch and Indicator Light
1) TRAC OFF Switch
When pressing, this switch turns the TRAC system to be inoperative. Pressing it again changes it to be operative.
When turning the ignition switch from ªOFFº to ªONº, TRAC system always becomes operative.
2) TRAC OFF Indicator Light
This light comes on when the TRAC system is set inoperative by the TRAC OFF switch, and informs the driver
accordingly. And blinks to alert the driver when a malfunction has occurred in the engine and TRAC system.
3) Slip Indicator Light
When the TRAC system is operative, the light blinks and informs the driver accordingly.
ABS & TRAC Actuator
1) Construction
The ABS & TRAC actuator consists of 12 two±position solenoid valves, 1 motor, 2 pumps 2 reservoirs and 2 pressure
regulator valves.
The 12 two±position solenoid valves consists of 2 master cut solenoid valves, 2 reservoirs cut solenoid valves, 4
pressure holding valves, and 4pressure reduction valves.
Pressure regulator valve is assembled into the master cut solenoid valve.
The basic construction and operation of the pump, reservoir, pressure holding valve, and pressure reduction valve
are shared with ABS.
a. Master Cut Solenoid Valve
When the TRAC system is active, a signal from the ABS & TRAC ECU causes the master cut solenoid valve to turn
ON in order to shut off the circuit between the master cylinder and the front brake wheel cylinder.

81CHASSISÐBRAKES
2) Initial Check
An initial check is carried out once every a few seconds after the ignition was turned on. The functions of each
solenoid valve and pump motor in the actuator are checked on order.
3) Self±Diagnosis
If the ABS & TRAC ECU detects a malfunction in the engine, ABS or TRAC system, it blinks the TRAC OFF
indicator light to alert the driver of the malfunction. At the same, the ABS & TRAC 1997 Avalon Repair Manual
(Pub. No. RM504U) for the diagnostic code check method, diagnostic code and diagnostic code clearance.
4) Fail±Safe
In the event of a malfunction in the engine, ABS or TRAC system, the ABS & ECU prohibits the TRAC system.
Thus, the brake and engine controls will operate in the same conditions as those without the TRAC system.

100BODY ELECTRICALÐLIGHTING
BODY ELECTRICAL
LIGHTING

DESCRIPTION
The new Camry has the following features:
Item
Outline
Daytime Running Light System
This system is designed to automatically activate the headlights during the
daytime to keep the car highly visible to other vehicles.
As in the previous model, the headlights are activated by reducing the nor-
mal high beam brightness.
The basic construction and operation are the same as in the previous model.
Light Auto Turn±Off System
When the ignition key is turned from the ON or ACC to LOCK position and
the driver's door is opened with the taillights and headlights turned on, this
system automatically turns them off.
The basic construction and operation are the same as in the previous model.
Light Auto Turn±Off System
This system is useful when entering the vehicle and inserting the ignition key
into the cylinder in the dark.
2 types of this system are used in the new Camry.
In the first type, when the doors are opened, this system turns on the illu-
minations around ignition key cylinder and dome light (only when the con-
trol switch is set to the DOOR position) simultaneously. These lights fade
out in about 15 seconds. However, under certain conditions such as when all
doors are locked, the lights will turn off immediately even if the system is
operating.
The basic construction and operation are the same as in the '97 Avalon.
In the second type, when the door is opened, this system turns on the illu-
minations around the ignition key cylinder. This illumination remains on for
about 5 seconds after the door is closed.

105 BODY ELECTRICALÐACCESSORIES
ACCESSORIES

DESCRIPTION
The new Camry includes the accessory systems shown in the below.
System
Outline
Power Window System
The power window system includes one±touch auto down and key±off opera-
tion functions. The one±touch auto down function automatically opens the
driver 's door window fully. The key±off operation function makes it possible
to operate the power windows for approximately 45 seconds after the igni-
tion key is turned to the ACC or LOCK position, if the front doors are not
opened.
The basic construction and operation of this system are the same as in the
previous model.
Door Lock Control System
This system has a ªkey±linked lock and unlock functionº and a ªkey±confine
prevention functionº. All doors can be locked and unlocked simultaneously
by a key operation at the front right or left foor. (The key needs to be oper-
ated twice to unlock all the doors at the driver's door.) If the door lock opera-
tion is performed when one of the front doors is open and the ignition key is
inserted in the key cylinder, doors are unlocked automatically to prevent the
ignition key from being left inside the vehicle.
The basic construction and operation are the same as in the previous model.
Wireless Door Lock Remote Con-
trol System
A remote control system in which the lock and unlock functions of all doors
and panic alarm function can be controlled by the signals emitted from a
transmitter is adopted. The transmitter is also provided with a 2±step unlock
function to unlock all the doors by pressing the switch twice.
The basic construction and operation are the same as in the '96 Avalon.
However, certain functions have been changed. For details, see page 107.
Theft Deterrent System
When an attempt is made to forcibly enter the vehicle or open the hood or
trunk lid without a key, or when the battery terminals are removed and re-
connected, this system sounds the horn and flashes the headlights and tail-
lights for about 1 minute to alert the owner. At the same time, it locks all the
doors and electronically disconnects the starter.
The basic operation is the same as in the '96 Avalon.
Power Seat
As in the previous model, the front seats are power assisted by electric mo-
tors so that the seat positions can be adjusted easily by a simple switch op-
eration.
The basic construction and operation are the same as in the previous model.

106BODY ELECTRICALÐACCESSORIES
SystemOutline
SRS Airbag
The SRS (Supplemental Restraint System) airbag is provided for the driver
and front passenger. The SRS airbag has been designed to lessen the shock to
the head and chest of the driver and front passenger in the event of a frontal
impact collision as a supplement to the seat belt.
A 1±sensor type airbag system is used in which the detection of decelera-
tion during a collision as well as control of the airbag system is accom-
plished by the airbag sensor assembly.
The basic construction and operation are the same as in the '96 Avalon.
However, the inflator for front passsenger and airbag sensor assembly have
been changed.
For details, see page 111.
Cruise Control System
Once it has been set at a desired vehicle speed, this system automatically
adjusts the engine throttle position to maintain the vehicle speed at the de-
sired speed without operating the acceleration pedal.
The basic construction and operation are the same as in the previous model.
However, in the new model, a new type acutator has been adopted. Also, the
functions of the cruise control ECU has been changed. For details, see page
116.
Moon Roof
The moon roof is a tilt±up and sliding type the same as in the previous mod-
el. This system includes ªkey±off operationº, which is the same as with the
power window system. The new model offers an additional ªone±touch slide
openº function which enables the moon roof to fully open when the slide
switch is pressed toward the opening side for a few seconds.
Electrical Remote Control Mirror
The electrical remote control mirrors used in the previous model are also
used in the new model. Also, the internal heater to remove water drops from
the mirror surface is provided.
Key Reminder System
When the driver's door is opened with the ignition key in the ACC or LOCK
position, this system sounds a buzzer to warn the driver that the ignition key
has not been removed.
The basic construction and operation are the same as in the previous model.

108BODY ELECTRICALÐACCESSORIES
2. Layout of Functional Parts
The major functional parts of the wireless door lock remote control system are whown below.
3. Construction
Transmitter
The transmitter is a key±holder type, which is
separate from the ignition key. the lock and unlock
functions of all doors can be controlled by operating
the switches on the ransmitter. Also, this transmitter
is equipped with a panic switch which activates the
security alarm of the theft deterrent system.

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