TOYOTA CAMRY 2000 Service Repair Manual

32ENGINEÐ5S±FE ENGINE
 MAJOR DIFFERENCES
Major differences between the new 5S±FE engine and previous engine are listed below.
Item
Features
Engine ProperThe squish area of the combustion chamber in the cylinder head has been
optimised to improve torque in the low±to mid±speed range.
Cooling SystemAn aluminum radiator core is used for weight reduction.
Intake and Exhaust System
The ports of the manifold have been extended to improve torque in the low±
to mid±speed range.
The exhaust manifold is made of stainless steel plates for improve engine per-
formance and weight reduction.
Through the optimized allocation of the exhaust pipe supports, the number of
supports has been reduced from 5 to 4, thus reducing the noise and vibration
which are transmitted to the vehicle body.
Fuel SystemA fuel returnless system has been adopted to prevent the internal temperature
of the fuel tank from rising and to reduce evaporative emissions.
Ignition SystemThe DIS (Direct Ignition System) contributes to the powerful high output by
providing a powerful spark to the engine.
Engine MountingTo reduce noise and vibration and to improve drivability, the allocation of the
engine mounts*1 and their characteristics have been revised.
Engine Control System
The injection pattern for engine starting have changed form the 2 group
injection type to sequential multiport injection type.
In place of the oxygen sensor (bank 1, sensor 1), a new air fuel ratio sensor has
been adopted. *
2
The power steering idle±up control has been changed from the system using
an air control valve to the one using a pressure switch and an IAC valve.
Emission Control System
The EGR valve body has been changed from cast iron to aluminum alloy for
weight reduction.
A TWC (Three±Way Catalytic Converter) that is integrated with a stainless
steel exhaust manifold has been adopted.*
2
The TWC, which was previously installed below the exhaust manifold has
been discontinued.*3
*1: Only for Automatic Transaxle Models.
*
2: Only for California Specification Models.
*
3: Except for California Specification Models.

33 ENGINEÐ5S±FE ENGINE
 ENGINE PROPER
1. Cylinder Head
The squish area of the combustion chamber in the cylinder head has been optimized to improve torque in the low±
to mid±speed range.
 INTAKE AND EXHAUAST SYSTEM
1. Intake Manifold
The low± to mid±speed range torque has been improved by increasing the length of the intake manifold port and by
reducing the intake air chamber capacity.

34ENGINEÐ5S±FE ENGINE
2. Exhaust Manifold
A stainless steel exhaust manifold is used for improving the engine performance and for reducing weight.
On the California specification model, the stainless steel exhaust maniflod and the TWC (Three±Way Catalytic
Converter) have been integrated to improve the warm±up performance of the TWC, thus reducing exhaust emissions.
 FUEL SYSTEM
1. Fuel Returnless System
The new Camry has adopted a fuel returnless system to reduce evaporative emissions. With the pressure regulator
housed inside the fuel tank, this system eliminates the return of fuel from the engine area. This prevents the internal
temperature of the fuel tank from risisng, and reduced evaporative emissions.

35 ENGINEÐ5S±FE ENGINE
 IGNITION SYSTEM
1. General
A DIS (Direct Ignition System) has been adopted in the new 5S±FE engine. The DIS in new 5S±FE engine is a
2±cylinder simultaneous ignition system which ignites 2±cyliners simultaneously with one ignition coil. In addition,
the igniter is integrated in the ignition coil for simpler system configuration.
2. Ignition Coil
Construction of the DIS system of the 5S±FE engine consists of 2 sets of ignition coils integrated with igniter and
with the high±tension cords attached directly onto the ignitioncoil.

36ENGINEÐ5S±FE ENGINE
3. Spark Plugs
Twin grouond electrode platinum tipped spar plugs have been adopted to rreflect the change of the DIS system.
Recommended Spark Plug Types
NIPPONDENSO
PK20TR11
NGKBKR6EKPB11
Plug Gap1.0 ± 1.1 mm
(0.039 ± 0.043 in.)
 ENGINE MOUNTING
1. Manual Transaxle Models
The charasteristics of the front and rear mounts have been optimized.
2. Automatic Transaxle Models
The fromt and rear mounts have been relocated upward to bring the engine's roll center closer to the engine's center
of gravity, resulting in reducing noise and vibration and improving drivability.
The internal orifices of the front and rear mounts have been modified to improve riding comfort and to ensure a
quieter operatioon at idling.

37 ENGINEÐ5S±FE ENGINE
 ENGINE CONTROL SYSTEM
1. General
The engine control system of the new 5S±FE engine is basically the same in construction and operation as that of the
previous 5S±FE engine, except fo rthe changed listed bleow.
The exhaust emissions has been reduced through the adoption of the sequential multiport fuel injection system for
engine starting and the air±fuel ratio sensor*
2
The function of an air conditioning amplifier has been internally added to the ECM.
The engine control system of the new 5S±FE engine and previous 5S±FE engine and previous 5S±FE engine are
compared below.
System
OutlineNewPrevious
SFI
(SequentialA D±type SFI system is used, which indirectly detects
intake air volume by manifold absolute pressure.(q
Multiport Fuel
Injection)The fuel injection system is a sequential multiport fuel
injection system.
ESA
(Electronic SparkIgnition Timing is determined by the ECM based on
signals from various sensors. The ECM corrects ignition
timing in response to engine knocking.

(Electronic Spark
Advance)Torque control correction during gear shifting has been
used to minimize the shift shock.*1*1
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.
Fuel Pump
ControlFuel pump operation is controlled by signal from the
ECM.
Oxygen Sensor
(Air Fuel Ratio
Sensor*
2)
Heater Control
Maintains the temperature of the oxygen sensor (or air
fuel ratio sensor*2) at an approppiate level to increase
accuracy of detection of the oxygen concentration in the
exhaust gas.Ð
EGR Cut±Off
ControlCuts off EGR according to the engine condition to
maintain drivability of the vehicle and durability of
EGR components.

Evaporative
Emission ControlThe ECM controls the purge flow of evaporative emis-
sions (HC) in the charcoal canister in accordance with
engine conditions.
*1*1
Air Conditioning
Cut±Off ControlBy turning the air conditioning compressor ON or
OFF in accordance with the engine condition,
drivability is maintained
*3
Diagnosis
When the ECM detects a malfunction, the ECM diagnoses
and memorized the failed section.
DiagnosisThe diagnosis system includes a function that detects a
malfunction in the evaporative control system.*1*1
Fail SafeWhen the ECM detects a malfunction, the ECM stops
or controls the engine according to the data already stored
in memory

*1: Only for Automatic Transaxle Models., *2: Only for California Specification Models,
*
3: The air conditioning magnet scutch controled by the ECM.

38ENGINEÐ5S±FE ENGINE
2. Construction
The configuration of the engine control system in the 5S±FE engine in the new CAmry is as shown in the following
chart. Shaded protions
differ from the 5S±FE engine on the previous model.
*1: Except for California Specification Models, *2: Only for California Specification Models, *3: Only for Automatic
Transaxle Models.

39 ENGINEÐ5S±FE ENGINE
3. Engine Control System Diagram
For Manual Transaxle Models
*1 : Except for California Specification Model
*
2 : Only for California Specification Model

40ENGINEÐ5S±FE ENGINE
For Automatic Transaxle Models
*1 : Except for California Specification Model
*2 : Only for California Specification Model

41 ENGINEÐ5S±FE ENGINE
4. Layout of Components