2000 TOYOTA CAMRY engine oil

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NEW FEATURES Ð 5S-FNE ENGINE11
INTAKE AND EXHAUST SYSTEM
1. Throttle Body
The throttle body is basically the same as that of the 5S-FE engine. However, to ensure the starting perfor-
mance at low temperatures, the air passage for the IAC (Idle Air Control) has been increased on the 5S-FNE
engine. The IAC valve is a 1-coil type with a built-in driver.
2. Exhaust Manifold
As in the California specification 5S-FE engine,
the stainless steel exhaust manifold and WU-TWC
(Warm Up Three-Way Catalytic Converter) have
been integrated to improve the warm-up perfor-
mance of TWC, thus reducing exhaust emissions.
However, the 5S-FNE engine uses a catalytic con-
verter that has been designed exclusively for the
CNG application, in which the loading of the noble
metal has been increased.
3. Exhaust Pipe
General
To secure sufficient luggage compartment capacity, the main muffler has been relocated below the rear
seat. Furthermore, the muffler capacity has been increased.
A 2-way exhaust control system has been adopted to improve engine performance and reduce
the exhaust noise.
Similar to the WU-TWC, the TWC (Three-Way Catalytic Converter) has been designed exclusively for
the CNG application, in which the loading of the noble metal has been increased.
Main Muffler
167CN06TWCSub Muffler
p12WU-TWC
167CN05

NEW FEATURES Ð 5S-FNE ENGINE 14
2. Fuel Tank
A fuel tank made with carbon fiber and alumi-
num lining has been adopted to prevent weight
increase.
Because the fuel tank expands along with the
increase in the pressure of the compressed gas,
the tank bands contain coil springs to accommo-
date the fluctuation in the perimeter of the tank.
The fuel tank is provided with a tank valve as-
sembly.
3. Tank Valve Assembly
General
The tank valve assembly is mounted on the tank
and consists of a fuel shutoff valve, inlet check
valve, relief valve and two manual cutoff valves.
167CN08
Coil Springs
Tank Valve
AssemblyTank Band
167CN26
Fuel
Temperatur
Sensor
Tank Valve Assembly

NEW FEATURES Ð 5S-FNE ENGINE 16
6. Fuel Filter
Mounted below the vehicle floor, the fuel filter re-
moves any moisture or oil from the fuel.
7. Fuel Pressure Regulator
The fuel pressure regulator regulates the fuel pressure by reducing the pressure of the compressed natural
gas from the fuel tank to the fuel injection pressure, which is 8 km/cm
2 (114 psi, 785 kPa).
Similar to the fuel shutoff valve for the fuel tank, a fuel shutoff valve is provided on the fuel inlet side
of the fuel pressure regulator to shut off the supply of fuel when the engine is stopped or during abnormal
conditions.
An oil separator that traps the moisture and oil in the fuel is provided on the low pressure side.
A built-in relief valve is provided to protect the parts located on the low pressure side.
While the fuel pressure is being reduced by the fuel pressure regulator, the Joule-Thomson effect associat-
ed with the expansion of the gas causes the fuel pressure regulator to be cooled excessively, exerting
unfavorable influence on the rubber parts such as diaphragms and fuel hoses.
Therefore, to raise the gas temperature, a water passage is provided in the fuel pressure regulator to
allow the engine coolant to warm the regulator.
Oil
Separator
Water Passage
Fuel
Shutoff
Valve
Relief Valve
167CN24 167CN25167CN10

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NEW FEATURES Ð 5S-FNE ENGINE19
ENGINE CONTROL SYSTEM
1. General
An engine control system based on the 5S-FE engine has been adopted. The knock sensor has been discontin-
ued because natural gas has a high octane value and is less susceptible to knocking.
The engine control system of 5S-FNE and 5S-FE engines are compared below.
System
Outline5S-FNE5S-FE
SFI
Sequential
A D-type SFI system is used, which indirectly detects
intake air volume by manifold absolute pressure sensor.
Sequential
Multiport Fuel
Injection
The fuel injection system is a sequential multiport fuel
injection system.
Ignition timing is determined by the ECM based on sig-
nals from various sensors.
ESA
Electronic Spark
AdvanceThe ECM corrects the ignition timing in response to en-
gine knocking in accordance with the signals received
from the knock sensor.
Ð
Advance
Torque control correction during gear shifting had been
used to minimize the shift shock.*1
IAC
(Idle Air Control)A rotary solenoid type IAC valve controls the fast idle
and idle speeds.
(1-Coil Type
Built-in Driver)(2-Coil Type)
Fuel Pump ControlFuel pump operation is controlled by signal from the
ECM.Ð
Fuel Cut-Off
Control
The fuel shutoff valves for the fuel tank, fuel pressure
regulator, and delivery pipe are shut off to stop the sup-
ply of fuel when the ignition switch is turned OFF or
during abnormal conditions (such as engine stalling,
SRS airbag deployed, etc.).
Ð
Oxygen Sensor
and Air Fuel Ratio
Sensor
Heater ControlMaintains the temperature of the oxygen sensor and air
fuel ratio sensor at an appropriate level to increase accu-
racy of detection of the oxygen concentration in the ex-
haust gas.
*2
EGR Cut-Off
ControlCuts off EGR according to the engine condition to
maintain drivability of the vehicle and durability of the
EGR components.

Evaporative
Emission ControlThe ECM controls the purge flow of evaporative emis-
sions (HC) in the charcoal canister in accordance with
engine conditions.
Ð
Air Conditioning
Cut-Off ControlBy turning the air conditioning compressor ON or OFF
in accordance with the engine condition, drivability is
maintained.
*3*3
When the ECM detects a malfunction, the ECM diag-
noses and memorized the failed section.
DiagnosisThe diagnosis system includes a function that detects a
malfunction in the evaporative emission control sys-
tem.
Ð
Fail-Safe
When 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 Model
*
2: Air fuel ratio sensor only for California specification model.
*
3: The air conditioning magnet clutch controled by the ECM

NEW FEATURES Ð 5S-FNE ENGINE
(Continued)
PIM
NE
G
THW
THA
VTA
AF
#10+
#20
#30
#40
IGT1,
IGT2
IGF
RSD
EGR
OX2
HTAF
HT2
MGC
FUEL W
PSW
ELS
NSW
F/PS
A/C SW
ECM
STA
SPD
R,2,L
STP
#40+ #30+ #20+ #10
FUEL
20
2. Construction
The configuration of the engine control system in the 5S-FNE engine is as shown in the following chart.
SENSORS
MANIFOLD ABSOLUTE
PRESSURE SENSOR
CRANKSHAFT POSITION
SENSOR
CAMSHAFT POSITION
SENSOR
ENGINE COOLANT TEMP.
SENSOR
INTAKE AIR TEMP. SENSOR
THROTTLE POSITION SENSOR
IGNITION SWITCH
COMBINATION METER
wVehicle Speed Signal
AIR FUEL RATIO SENSOR
(Bank 1, Sensor 1)
HEATED OXYGEN SENSOR
(Bank 1, Sensor 2)
POWER STEERING OIL
PRESSER SWITCH
TAILLIGHT & REAR WINDOW
DEFOGGER SYSTEM
PARK/NEUTRAL POSITION
SWITCH
STOP LIGHT SWITCH
AIR CONDITIONING SWITCH
AIRBAG SENSOR ASSEMBLY
wFuel Cut-Off Signal
ACTUATORS
SFI
No. 1 INJECTOR
No. 2 INJECTOR
No. 3 INJECTOR
No. 4 INJECTOR
ESA
IGNITERS and
IGNITION COILS
SPARK PLUGS
IAC
CONTROL VALVE
EGR
VSV
AIR FUEL RATIO SENSOR
HEATER CONTROL
AIR FUEL RATIO SENSOR
HEATER
OXYGEN SENSOR HEATER
CONTROL
HEATED OXYGEN SENSOR
HEATER
AIRE CONDITIONING
CUT-OFF CONTROL
MAGNET CLUTCH RERAY
FUEL GAGE
LOW FUEL LEVEL WARNING
LIGHT

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Toyota offers a complete line of products to help you keep
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When it’s time to get under the hood (or under the car), products
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Genuine Toyota Long Life Antifreeze Coolant is the same
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Your Toyota’s engine features highly advanced technology
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Genuine Toyota Motor Oil is formulated with a special combi-
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Do-It-Yourself Products
TOYOTA MAINTENANCE & REPAIR SUPPORT13

SCHEDULED MAINTENANCE LOGS19 Towing a Trailer or Using a Camper
or Car-Top Carrier
•Inspect brake linings/drums and brake pads/discs
•Inspect nuts and bolts on chassis and body
•Replace differential oil
•Replace transmission fluid or oil
•Replace transfer oil *
•Lubricate propeller shaft and re- torque bolts*
Off-Road Maintenance
If you own a Land Cruiser or a four- wheel drive RAV4,
Tacoma or 4Runner, you should check the following items
daily whenever you drive off- road through deep sand, mud
or water:
•Brake lines and hoses
•Brake linings/drums and brake pads/discs
•Engine air filter
•Differential oil
•Steering linkage
•Transfer oil
•Transmission fluid or oil
•Wheel bearings
For all four- wheel drive vehicles except RAV4, you should
also lubricate the propeller shafts daily.
Determining Your Vehicle’s Maintenance Needs

SCHEDULED MAINTENANCE LOGS21 Brake Linings/Drums and Brake Pads/Discs
Check the brake linings (shoes) and drums for scoring, burning,
fluid leakage, broken parts and excessive wear. Check the pads for
excessive wear and the discs for runout, excessive wear and fluid
leakage. A qualified technician should perform these inspections.
Charcoal Canister (CA, MA and NY vehicles)
Check for internal damage and clogging. If necessary, clean
with compressed air or replace. A qualified technician should
perform these operations.
Differential Oil
Inspect each component for signs of leakage. If you discover any
leakage, have it repaired by a qualified technician immediately.
Drive Belts
Inspect for cracks, excessive wear and oiliness. Check the belt ten-
sion and adjust if necessary. Replace the belts if they are damaged.
Drive Shaft Boots
Check the drive shaft boots and clamps for cracks, deteriora-
tion and damage. Replace any damaged parts and, if necessary,
repack the grease. Selected models also require periodic inspec-
tion of the flange bolts for proper torque. A qualified technician
should perform these operations.
Engine Air Filter
Check for damage, excessive wear and oiliness. Replace if necessary.
Engine Coolant
Drain and flush the cooling system and refill with an ethylene-
glycol type coolant. A qualified technician should perform
this operation.
Engine Oil and Oil Filter
Change the oil filter and replace the engine oil with API SH,
Energy- Conserving II multigrade or ILSAC multigrade oil.
For recommended viscosity, refer to your
Owner’s Manual.
Explanation of Maintenance Items