2000 TOYOTA CAMRY expansion valve

CAMRY ± NEW FEATURES
167CN10
172CM15
Fuel
Shutoff
Valve
Water Passage
Oil SeparatorRelief Valve 46
Fuel Filter
Mounted below the vehicle floor, the fuel filter
removes any moisture or oil from the fuel.
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 kg / 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
associated with the expansion of the gas causes the fuel pressure regulator to be cooled excessively, exert-
ing 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.

RADIATOR
The radiator performs the function of cooling the coolant which has passed through the water
jacket and become hot, and it is mounted in the front of the vehicle. The radiator consists of an
upper tank and lower tank, and a core which connects the two tanks. The upper tank contains the
inlet for coolant from the water jacket and the filler inlet. It also has a hose attached through
which excess coolant or steam can flow. The lower tank has an outlet and drain cock for the
coolant. The core contains many tubes through which coolant flows from the upper tank to the
lower tank as well as to cooling fins which radiate heat away from the coolant in the tubes. The
air sucked through the radiator by the electric fan, as well as the wind generated by the vehicle's
travel, passes through the radiator, cooling the coolant. Models with automatic transmission
include an automatic transmission fluid cooler built into the lower tank of the radiator. A fan with
an electric motor is mounted behind the radiator to assist the flow of air through the radiator. The
fan operates when the engine coolant temperature becomes high in order to prevent it from be-
coming too high.
RADIATOR CAP
The radiator cap is a pressure type cap which seals the radiator, resulting in pressurization of the
radiator as the coolant expands. The pressurization prevents the coolant from boiling even when
the engine coolant temperature exceeds 100°C (212°F). A relief valve (pressurization valve) and a
vacuum valve (negative pressure valve) are built into the radiator cap. The relief valve opens and
lets steam escape through the overflow pipe when the pressure generated inside the cooling sys-
tem exceeds the limit (coolant temperature: 110±120°C (230±248°F), pressure; 58.8103.0 kpa
(0.6±1.05 kgf/cm
2, 8.5±14.9 psi). The vacuum valve opens to alleviate the vacuum which develops
in the cooling system after the engine is stopped and the engine coolant temperature drops. The
valve's opening allows the coolant in the reservoir tank to return to the cooling system.
RESERVOIR TANK
The reservoir tank is used to catch coolant which overflows from the cooling system as a result
of volumetric expansion when the coolant is heated. The coolant in the reservoir tank returns to
the radiator when the coolant temperature drops, thus keeping the radiator full at all times and
avoiding needless coolant loss.
Check the reservoir tank level to learn if the coolant needs to be replenished.
WATER PUMP
The water pump is used for forced circulation of coolant through the cooling system. It is
mounted on the front of the cylinder block and driven by a timing belt.
THERMOSTAT
The thermostat has a wax type bypass valve and is mounted in the water inlet housing. The
thermostat includes a type of automatic valve operated by fluctuations in the engine coolant
temperature. This valve closes when the engine coolant temperature drops, preventing the
circulation of coolant through the engine and thus permitting the engine to warm up rapidly. The
valve opens when the engine coolant temperature has risen, allowing the circulation of coolant.
Wax inside the thermostat expands when heated and contracts when cooled. Heating the wax
thus generates pressure which overpowers the force of the spring which keeps the valve closed,
thus opening the valve. When the wax cools, its contraction allows the force of the spring to take
effect once more, closing the valve. The thermostat in this engine operates at a temperature of
82
C (180
F).
± 5S±FE ENGINECOOLING SYSTEMEG1±239

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

I01387
Condition : Periodically cools and then fails to cool
I01388
Condition: Insufficient cooling
± AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC±5
2487 Author: Date:
(2) Moisture present in refrigeration system.
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
During operation, pressure on low
pressure side sometimes become
a vacuum and sometime normal
Moisture entered in refrigeration
system freezes at expansion valve
orifice and temporarily stops cycle,
but normal state is restored after a
time when the ice melts
Drier oversaturated state

Moisture in refrigeration system
freezes at expansion valve orifice
and blocks circulation of refriger-
ant(1) Replace receiver
(2) Remove moisture in cycle
through repeatedly evacuating air
(3) Charge proper amount of new
refrigerant
(3) Insufficient cooling
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy

Pressure low on both low and
high pressure sides

Bubbles seen in sight glass con-
tinuously

Insufficient cooling performance
Gas leakage at some place in re-
frigeration system
Insufficient refrigerant in system

Refrigerant leaking
(1) Check for gas leakage with gas
leak detector and repair if neces-
sary
(2) Charge proper amount of re-
frigerant
(3) If indicated pressure value is
near 0 when connected to gauge,
create the vacuum after inspecting
and repairing the location of the
leak

I01389
Condition: Insufficient cooling
I01449
Condition: Does not cool (Cools from time to time in some cases) AC±6
± AIR CONDITIONINGAIR CONDITIONING SYSTEM
2488 Author: Date:
(4) Poor circulation of refrigerant
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy

Pressure low in both low and
high pressure sides

Frost on tube from receiver to
unit
Refrigerant flow obstructed by dirt
in receiverReceiver cloggedReplace receiver
(5) Refrigerant does not circulate
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy

Vacuum indicated on low pres-
sure side, very low pressure indi-
cated on high pressure side

Frost or dew seen on piping be-
fore and after receiver/ drier or ex-
pansion valve
Refrigerant flow obstructed by
moisture or dirt in refrigeration sys-
tem

Refrigerant flow obstructed by
gas leakage from expansion valve
Refrigerant does not circulate
(1) Check expansion valve
(2) Clean out dirt in expansion
valve by blowing with air
(3) Replace receiver
(4) Evacuate air and charge new
refrigerant to proper amount
(5) For gas leakage from expan-
sion valve, replace expansion
valve

I01450
Condition: Insufficient cooling
I01393
Condition : Does not cool AC±8
± AIR CONDITIONINGAIR CONDITIONING SYSTEM
2490 Author: Date:
(8) Expansion valve improperly
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy

Pressure too high on both low
and high pressure sides

Frost or large amount of dew on
piping on low pressure side
Trouble in expansion valve

Excessive refrigerant in low
pressure piping

Expansion valve opened too
wide
Check expansion valve
Replace if defective
(9) Defective compression compressor
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy

Pressure too high on low and
high pressure sides

Pressure too low on high pres-
sure side
Internal leak in compressor

Compression defective

Valve leaking or broken sliding
parts
Repair or replace compressor

AC0LL±02
Z19146
1MZ±FE engine:
No. 1 Engine Coolant Temperature
(ECT) Switch
Compressor
Engine Room Junction Block No. 2

Engine Main Relay
(Marking: ENGINE MAIN)

No. 1 Cooling Fan Relay
(Marking: FAN NO.1)Engine Room Relay Block No. 1

Magnetic Clutch Relay
(Marking: MG CLT)

Heater Main Relay
(Marking: HTR)

No. 2 Cooling Fan Relay
(Marking: FAN NO.2)

No. 3 Cooling Fan Relay
(Marking: FAN NO.3)
5S±FE engine models:
Engine Coolant Temperature
(ECT) Switch Receiver Pressure SwitchCondenser Fan

Fan Motor1MZ±FE engine:
No. 2 Engine Coolant Temperature
(ECT) Switch
Condenser
Blower Unit A/C Unit
A/C Control Assembly

A/C Switch

Blower Speed Control Switch

Mode Switch
Air Outlet Servomotor
Heater Radiator
Thermistor
Blower ResistorBlower Motor 1MZ±FE:
A/C Amplifier Expansion Valve5S±FE engine:
ECM (Built in A/C Amplifier)
Evaporator
± AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC±13
2495 Author: Date:
LOCATION

± AIR CONDITIONINGTROUBLESHOOTING
AC±15
2497 Author: Date:
Cool air comes out only at high engine rpm
1. Refrigerant volume
2. Drive belt
3. Magnetic clutch
4. Compressor
5. Condenser
6. Condenser fan
7. Receiver
8. Expansion valve
9. Evaporator
10.Thermistor
11. Refrigerant line
12.Pressure switch
13.*
1 ECM
*2 A/C amplifier
AC±3
AC±16
AC±16
AC±39
AC±52
AC±74
AC±49
AC±59
AC±30
AC±24
AC±21
AC±67
DI±218
AC±88
No engine idle±up when A/C switch ON
1. *1 ECM
*2 A/C amplifier
2. Wire harness
DI±218
AC±88
±
Blinking of A/C indicator
1. *1 ECM
*2 A/C amplifier
2. Thermistor
3. Compressor
DI±218
AC±88
AC±24
AC±39
A/C indicator does not lights up when turn mode switch to DEF.
position
1. A/C Fuse
2. Mode switch
3. A/C switch
4. *
1 ECM
*2 A/C amplifier
5. Wire harness
±
AC±84
AC±84
DI±218
AC±88
±
No warm air comes out
1. Engine coolant volume
2. A/C control assembly
3. Heater radiator±
AC±80
AC±57
No condenser fan operation
1. CDS FAN Fuse
2. Engine main relay
3. Cooling fan relay No. 1
4. Cooling fan relay No. 2
5. Cooling fan relay No. 3
6. Condenser fan motor
7. Pressure switch
8. *
1 Engine coolant temp. switch
*2 No. 1 Engine coolant temp. switch
9. *2No. 2 Engine coolant temp. switch
10.Wire harness
±
±
AC±72
AC±72
AC±72
AC±74
AC±67
AC±92
AC±92
AC±92
±
*1: 5S±FE Engine Models
*
2: 1MZ±FE Engine Models