1986 TOYOTA CAMRY V20 low oil pressure

Light Control Rheostat
TAIL Fuse
IGN Fuse
Water Temperature Sender Gauge
Ground
Seat Beh Warning Relay
Brake Fluid Level Warning Switch and Parking
Brake Switch
CHARGE Fuse
TCCS ECU
A.B.S. ECU
Cruise Control ECU and ECT ECU
Ground
Fuel Sender Gauge Terminal 3
Fuel Sender Gauge Terminal 2
GAUGE Fuse
DOME Fuse
Door Courtesy Switch
Low Oil Pressure Switch
Light Failure Sensor
Combination Meter and Gauges
(w/o Tachometer)
Turn Signal Switch Terminal 28
Ground
Turn Signal Switch Terminal 25
Turn Signal Switch Terminal 23 (USA)
HEAD±HI (RH) Fuse (CANADA)
A/T Oil Temperature Switch
COMBINATION METER CIRCUIT
Wiring Connector Side
No.
± BODY ELECTRICAL SYSTEMCombination MeterBE±32

Light Control Rheostat
TAIL Fuse
IGN Fuse
Water Temperature Sender Gauge
Ground
Seat Belt Warning Relay
Brake Fluid Level Warning Switch and Parking
Brake Switch
CHARGE Fuse
TCCS ECU ,
A. B. S. ECU
Cruise Control ECU and ECT ECU
Ground
Fuel Sender Gauge Terminal 3
Fuel Sender Gauge Terminal 2
. GAUGE Fuse
DOME Fuse
Door Courtesy Switch
Low Oil Pressure Switch
Light Failure Sensor
Turn Signal Switch Terminal 28
Ground
Turn Signal Switch Terminal 25
Turn Signal Switch Terminal 23 (USA)
HEAD±HI (RH) Fuse (CANADA)
A/T Oil Temperature Switch
Igniter
Combination Meter and Gauges
(w/ Tachometer)
COMBINATION METER CIRCUIT
Wiring Connector Side
No.
± BODY ELECTRICAL SYSTEMCombination MeterBE±33

Low Oil Pressure Warning
INSPECTION OF PRESSURE WARNING
1. INSPECT WARNING LIGHT OPERATION
(a) Disconnect the connector from the pressure switch
and ground the connector on the wire harness side.
(b) Turn the ignition switch ON, check that t he warning
light lights.
If the warning light does not light, test the bulb.
2. INSPECT PRESSURE SWITCH OPERATION
(a) Disconnect the connector from the switch.
(b) Check that there is continuity between terminal and
ground with the engine stopped.
(c) Check that there is no continuity between terminal
and ground with the engine running.
HINT: Oil pressure should be over 0.3 kg/cm2 (4.3 psi, 29
kPa).
If operation is not as specified, replace the switch.If resistance value is not as specified, replace the send-
er gauge. 3. MEASURE SENDER GAUGE RESISTANCE
Measure the resistance between terminal and ground.
ater temperature oC
(OF)Resistance (
)
N i ppo nde nso Yazaki
± BODY ELECTRICAL SYSTEMCombination MeterBE±39

PRECAUTIONS
1. Care must be taken to replace each part properly as it
could affect the performance of the brake system and re-
sult in a driving hazard. Replace the parts with parts of the
same part number or equivalent.
2. It is very important to keep parts and the area clean when
repairing the brake system.
Parking brake out of adjustment
Binding parking brake wire
Booster push rod out of adjustment
Tension or return spring faulty
Brake line restricted
Lining cracked or distorted
Pad cracked or distorted
Wheel cylinder or caliper piston sticking
Adjuster broken
Master cylinder faulty
Brake shoes distorted, linings worn or glazed
Brake pads distorted, worn or glazed
Drum or disc out of round
Tension or return spring faulty
Wheel cylinder faulty
Brake cylinder faulty
Piston frozen in brake cylinder
Brake pad stickingReplace brake shoes
Replace pads
Repair leak
Repair or replace master cylinder
Bleed brake system
Repair wheel cylinder
Repair cylinder
Repair brake cylinder
Repair or replace adjuster Air in brake system
Wheel cylinder faulty
Brake cylinder faulty
Piston seals worn or damaged
Rear brake automatic adjuster faulty
Adjust parking brake
Repair as necessary
Adjust push rod
Replace spring
Repair as necessary
Replace shoe
Replace pad
Repair as necessary
Replace pads
Replace drum or disc
Replace spring
Repair wheel cylinder
Repair cylinder
Repair cylinder
Replace padsInflate tires to proper pressure
Check for cause. Replace shoes
or pads
Replace brake shoes Linings worn
Brake pads worn
Leak in brake system
Master cylinder faulty
BR±18, 34
BR±18, 26
34
BR±26, 42
BR±26
BR±18, 34
BR±18, 34
BR±18, 34 Replace adjuster
Repair or replace master
cylinder
TROUBLESHOOTING
BR±7
BR±26
BR±18, 34
BR±18, 34
BR±26, 42
BR±18,34
BR±18, 26
34
Oil or grease on shoes or pads Tires improperly inflated
BR±18, 26
34
BR±26, 42
Low or spongy
pedalBR±26
BR±18, 34
BR±1 6
BR±26, 42 Possible cause
Brakes drag
Brakes pullRemedy Problem
Page
BR±8
BR±9BR±9
± BRAKE SYSTEMPrecautionsBR±2

PRECAUTIONS
1. Care must be taken to replace each part properly as it
could affect the performance of the brake system and re-
sult in a driving hazard. Replace the parts with parts of the
same part number or equivalent.
2. It is very important to keep parts and the area clean when
repairing the brake system.
Parking brake out of adjustment
Binding parking brake wire
Booster push rod out of adjustment
Tension or return spring faulty
Brake line restricted
Lining cracked or distorted
Pad cracked or distorted
Wheel cylinder or caliper piston sticking
Adjuster broken
Master cylinder faulty
Brake shoes distorted, linings worn or glazed
Brake pads distorted, worn or glazed
Drum or disc out of round
Tension or return spring faulty
Wheel cylinder faulty
Brake cylinder faulty
Piston frozen in brake cylinder
Brake pad stickingReplace brake shoes
Replace pads
Repair leak
Repair or replace master cylinder
Bleed brake system
Repair wheel cylinder
Repair cylinder
Repair brake cylinder
Repair or replace adjuster Air in brake system
Wheel cylinder faulty
Brake cylinder faulty
Piston seals worn or damaged
Rear brake automatic adjuster faulty
Adjust parking brake
Repair as necessary
Adjust push rod
Replace spring
Repair as necessary
Replace shoe
Replace pad
Repair as necessary
Replace pads
Replace drum or disc
Replace spring
Repair wheel cylinder
Repair cylinder
Repair cylinder
Replace padsInflate tires to proper pressure
Check for cause. Replace shoes
or pads
Replace brake shoes Linings worn
Brake pads worn
Leak in brake system
Master cylinder faulty
BR±18, 34
BR±18, 26
34
BR±26, 42
BR±26
BR±18, 34
BR±18, 34
BR±18, 34 Replace adjuster
Repair or replace master
cylinder
TROUBLESHOOTING
BR±7
BR±26
BR±18, 34
BR±18, 34
BR±26, 42
BR±18,34
BR±18, 26
34
Oil or grease on shoes or pads Tires improperly inflated
BR±18, 26
34
BR±26, 42
Low or spongy
pedalBR±26
BR±18, 34
BR±16
BR±26, 42 Possible cause
Brakes drag
Brakes pullRemedy Problem
Page
BR±8
BR±9BR±9
± BRAKE SYSTEMTroubleshootingBR±2

The cooling system is composed of the water jacket (inside the cylinder block and cylinder head), radiator,
water pump, thermostat, electric fan, hoses and other components.
Coolant which is heated in the water jacket is pumped to the radiator, through which an electric fan blows air
to cool the coolant as it passes through. Coolant which has been cooled is then sent back to the engine by
the water pump, where it cools the engine.
The water jacket is a network of channels in the shell of the cylinder block and cylinder head through which
coolant passes. It is designed to provide adequate cooling of the cylinders and combustion chambers which
become heated during engine operation.
RADIATOR
The radiator performs the function of cooling the coolant which has passed through the water jacket and be-
come 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 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 be-
hind the radiator to assist the flow of air through the radiator. The fan operates when the coolant tempera-
ture becomes high in order to prevent it from becoming 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 coolant tempera-
ture 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 system exceeds the limit (coolant temperature: 110 ±
120°C, 230 ± 248°F, pressure; 0.3 ±1.0 kg/cm
2, 4.3 ±14.2 psi, 29.4 ± 98.1 kPa). The vacuum valve opens to
alleviate the vacuum which develops in the coolant system after the engine is stopped and the coolant tem-
perature drops.
The valves'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 the cooling system as a result of volumetric ex-
pansion when the coolant is heated. The coolant in the reservoir rank returns to the radiator when the cool-
ant temperature drops, thus keeping the radiator full at all times and avoiding needless coolant loss. Check
the reservoir tank level to find out 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 by±pass valve and is mounted in the water inlet housing. The thermostat in-
cludes a type of automatic valve operated by fluctuations in the coolant temperature. This valve closes when
the 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 coolant temperature has risen, allowing the cir-
culation 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 causes 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).
± COOLING SYSTEMDescriptionCO±3

3. (3S±FE)
REPLACE ENGINE COOLANT
(a) Remove the radiator cap.
CAUTION: To avoid the danger of being burned, do not re-
move it while the engine and radiator are still hot
as fluid and steam can be blown out under pressure.
(b) Drain the coolant from the .radiator and engine drain cocks.
(Engine drain cock at the right rear of engine block.)
(c) Close the drain cocks.
Torque (Engine drain cock):
130 kg±cm (9 ft±Ib, 13 N±m) HINT: If the engine tends to overheat, removal of the
thermostat will adversely effect cooling efficiency.
CHECK AND REPLACEMENT OF
ENGINE COOLANT
1. CHECK ENGINE COOLANT LEVEL AT RESERVE TANK
The coolant level should be between the ºLOWº and
ºFULLº lines.
If low, check for leaks and add coolant up to the ºFULLº
line.
Dirt, leaves or insects on radiator or condenser
Hoses, Water pump, thermostat housing, radiator,
heater, core, plugs or head gasket leakage
Thermostat faulty
Incorrect ignition timing
Electric cooling system faulty
Radiator hose plugged or rotted
Water pump faulty
Radiator plugged or cap faulty
Cylinder head or block cracked or water passage
clogged
2. CHECK ENGINE COOLANT QUALITY
There should not be any excessive deposits of rust or scales
around the radiator cap or radiator filler hole, and the cool-
ant should be free from oil.
If excessively dirty, replace the coolant.
Check thermostat
Reset tinning
Inspect electric cooling system
Replace hose
Replace water pump
Check radiator and cap
Repair as necessary
TROUBLESHOOTING
CO±12, 13
IG±17, 20
CO±20, 22 Clean radiator or condenser
Repair as necessary Engine overheats
Possible causeRemedy Problem
CO±6, 9 Page
± COOLING SYSTEM
TroubleshootingCO±4

3. (3S±FE)
REPLACE ENGINE COOLANT
(a) Remove the radiator cap.
CAUTION: To avoid the danger of being burned, do not re-
move it while the engine and radiator are still hot
as fluid and steam can be blown out under pressure.
(b) Drain the coolant from the .radiator and engine drain cocks.
(Engine drain cock at the right rear of engine block.)
(c) Close the drain cocks.
Torque (Engine drain cock):
130 kg±cm (9 ft±Ib, 13 N±m) HINT: If the engine tends to overheat, removal of the
thermostat will adversely effect cooling efficiency.
CHECK AND REPLACEMENT OF
ENGINE COOLANT
1. CHECK ENGINE COOLANT LEVEL AT RESERVE TANK
The coolant level should be between the ºLOWº and
ºFULLº lines.
If low, check for leaks and add coolant up to the ºFULLº
line.
Dirt, leaves or insects on radiator or condenser
Hoses, Water pump, thermostat housing, radiator,
heater, core, plugs or head gasket leakage
Thermostat faulty
Incorrect ignition timing
Electric cooling system faulty
Radiator hose plugged or rotted
Water pump faulty
Radiator plugged or cap faulty
Cylinder head or block cracked or water passage
clogged
2. CHECK ENGINE COOLANT QUALITY
There should not be any excessive deposits of rust or scales
around the radiator cap or radiator filler hole, and the cool-
ant should be free from oil.
If excessively dirty, replace the coolant.
Check thermostat
Reset tinning
Inspect electric cooling system
Replace hose
Replace water pump
Check radiator and cap
Repair as necessary
TROUBLESHOOTING
CO±12, 13
IG±17, 20
CO±20, 22 Clean radiator or condenser
Repair as necessary Engine overheats
Possible causeRemedy Problem
CO±6, 9 Page
± COOLING SYSTEMCheck and Replacement of Engine CoolantCO±4