1986 TOYOTA CAMRY V20 engine overheat

(e) Tighten the O±ring fittings or the bolted type fittings to
the specified torque.
4. WHEN CONNECTING MANIFOLD GAUGE;
(a) Be sure to connect the charging hose end with a pin
to the compressor charging valve.
(b) The letter ºDº engraved near the compressor service
valve indicates the high pressure side, and ºSº indi-
cates the low pressure side. Pay careful attention
when connecting the hose.
(c) Tighten hose by hand.
(d) To prevent loosening of connected hose, do not apply
drops of compressor oil to the seat of connection.
HINT: After connecting the manifold gauge and the refrig±
erant container (service can), discharge any air in the
hoses.
5. WHEN EVACUATING;
Approx. 15 minutes after removal, check the system for
leaks, then take at least another 15 minutes to make sure
the air is fully removed.
6. WHEN HANDLING REFRIGERANT CONTAINER
(SERVICE CAN);
(a) Must never be heated.
(b) Must be kept below 4

°C (1 04°F).
(c) If warming service can with hot water, be careful that
the valve on top of the service can is never immersed
in the water, as the water may permeate into the refrig-
erant cycle.
(d) Empty service cans must never be re±used.
7. WHEN A/C IS ON AND REFRIGERANT GAS IS
BEING REPLENISHED;
(a) If there is not enough refrigerant gas in the refrigerant
cycle, oil lubrication becomes insufficient and com-
pressor burnout may occur, so take care to avoid this.
(b) If the valve on the high pressure side is opened, refrig-
erant flows in reverse and causes the service can to
rupture, so only open and close the vlave on the low
pressure side.
(c) If the service can is inverted and refrigerant is inserted
in a liquid state, the liquid is compressed and the com-
pressor brakes down, so the refrigerant must be in-
serted in a g¿¿seous state.
(d) Be careful not to insert too much refrigerant gas, as
this causes trouble such as inadequate cooling, poor
fuel economy, engine overheat, etc.
8. WHEN USING GAS±CYLINDER TYPE LEAK
DETECTION INSTRUMENT;
(a) As a naked flame is used, first make sure that there are
no flammable substances nearby before using it.
(b) Be careful, as poisonous gas is produced when
refrigerant gas comes in contact with heat parts.
± AIR CONDITIONING SYSTEMGenera! InformationAC±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

No fuel supply to injector
wNo fuel in tank
wFuel pump no working
wFuel filter clogged
wFuel line clogged or leaking
EFI system problems
Ignition problems
wIgnition coil
wIgniter
wDistributor
Spark plug faulty
High±tension cord disconnected or broken
Vacuum leaks
wPCV line
wEGR line
wIntake manifold
wAir intake chamber
wThrottle body
wISC valve
wBrake booster tine
Pulling in air between air flow meter and
throttle body
Low compression
Spark plug faulty
High±tension cord faulty
Ignition problems
wIgnition coil
wIgniter
wDistributor
Incorrect ignition timing
Vacuum leaks
wPCV line
wEGR line
wIntake manifold
TROUBLESHOOTING
ENGINE OVERHEATING
Inspect coil
Inspect igniter
Inspect distributor
Reset timing
Repair as necessaryInspect plugs
Inspect cords
Repair as necessary Troubleshoot cooling system
Reset timing
Engine will not start/
hard to start
(cranks OK)Cooling system faulty
Incorrect ignition timing
Repair as necessary
Perform spark test Engine will not crank or
cranks slowly
IG±7, 12
IG±8, 12
IG±7, 12
IG±16, 20 Rough idle, stalls or
misses
HARD STARTING
Troubleshoot starting system
Inspect plugs
Inspect cords Troubleshoot EFI system
ROUGH IDLING
Starting system faulty
Check compression Repair as necessary Engine overheats
IG±6, 10
IG±6, 10 IG±6, 10
IG±6, 10 Possible cause
Possible cause Possible cause
Remedy Remedy
Problem
Remedy Problem Problem
IG±5, 9
EM±22Page
Page
Page CO±4
FI±10 ST±2
± ENGINE MECHANICALTroubleshootingEM±6

Spark plug faulty
High±tension cord faulty
Vacuum leaks
wPCV line
wEGR line
wIntake manifold
wAir intake chamber
wThrottle body
wISC valve
wBrake booster line
Pulling in air between air flow meter and
throttle body
Incorrect ignition timing
Incorrect valve clearance
Fuel system clogged
Air cleaner clogged
EFI system problems
Emission control system problem
(cold engine)
wEGR system always on
Engine overheats
Low compression Vacuum leaks (Cont'd)
wAir intake chamber
wThrottle body
wISC valve
wBrake booster line
Pulling in air between air flow meter and
throttle body
Incorrect idle speed
Incorrect valve clearance
EFI system problems
Engine overheats
Low compressionCheck ISC system
Adjust valve clearance
Repair as necessary
Check cooling system
Check compression
Reset timing
Adjust valve clearance
Check fuel system
Check air cleaner
Repair as necessary
ENGINE HESITATES/POOR ACCELERATION
Check EGR system
Check cooling system
Check compressionInspect plugs
Inspect cords
Repair as necessary
ROUGH IDLING (Cont'd)
Rough idle, stalls or
misses (Cont'd)
Engine hesitates/
poor acceleration
EC±8,21
Co±4
EM±22FI±116, 118
EM±11, 15
IG±16, 20
EM±11, 15 Repair as necessary
IG±6, 10
IG±6, 10 Possible causePossible cause
CO±4
EM±22 Remedy Problem
RemedyProblemPage
MA±5Page
± ENGINE MECHANICALTroubleshootingEM±7

Incorrect ignition timing
Ignition problems
wIgnition coil
wIgniter
wDistributor
wHigh±tension cords
Ignition wiring disconnected or broken
Spark plug faulty
Ignition wiring faulty
Incorrect ignition timing
Ignition problems
wIgnition coil
wIgniter
wDistributor
wHigh±tension cordsReset timing
Inspect coil
Inspect igniter
Inspect distributor
Inspect high±tension cords
Inspect wiring
Inspect coil
Inspect igniter
Inspect distributor
Inspect high±tension cords
Spark plug faulty
Ignition wiring faulty
Incorrect ignition timingIG±17, 20
IG±7, 12
IG±8, 12
IG±7, 12
IG±6, 10
Spark plug faulty
Incorrect ignition timing Engine will not start/
hard to start
(cranks OK)
TROUBLESHOOTING
Engine dieseling
(runs after ignition switch
is turned off)Inspect plugs
Inspect wiring
Reset tinningInspect plugs
inspect wiring
Reset timing
Muffler explosion
(after fire) all the timeEngine hesitates/
poor accelerationIG±7, 12
IG±8, 12
IG±7, 12
IG±6, 10
Inspect plugs
Reset timing Incorrect ignition timing
Incorrect ignition timing
Incorrect ignition timing
Incorrect ignition timing Poor gasoline mileageRough idle or stalls
IG±6, 10
120
Engine overheatsEngine backfiresPossible cause
Reset timing
Reset timingReset timingReset timingIG±17, 20 IG±17, 20
IG±17, 20
IG±17, 20 IG±17, 20
IG±17, 20 Problem
IG±6, 10
IG±6, 10 Remedy
Page
± IGNITION SYSTEMTroubleshootingIG±3

PRECAUTIONS FOR VEHICLES EQUIPPED WITH A
CATALYTIC CONVERTER
CAUTION: If large amounts of unburned gasoline flow into the converter, it may overheat
and create a fire hazard. To prevent this, observe the following precautions and
explain them to your customer.
1. Use only unleaded gasoline.
2. Avoid prolonged idling.
Avoid running the engine at idle speed for more than 20
minutes.
3. Avoid spark jump test.
(a) Spark jump test only when absolutely necessary. Perform this test as rapidly as pos-
sible.
(b) While testing, never race the engine.
4. Avoid prolonged engine compression measurement.
Engine compression tests must be made as rapidly as possible.
5. Do not run engine when fuel tank is nearly empty.
This may cause the engine to misfire and create an extra
load on the converter.
6. Avoid coasting with ignition turned off and prolonged braking.
7. Do not dispose of used catalyst along with parts contaminated with gasoline or oil.(f) When steam cleaning an engine, protect the distribu-
tor, air filter and VCV from water.
(g) Never use an impact wrench to remove or install tem-
perature switches or temperature sensors.
(h) When checking continuity at the wire connector, insert
the tester probe carefully to prevent terminals from
bending.
(i) When using a vacuum gauge, never force the hose
onto a connector that is too large. Use a step±down
adapter instead. Once the hose has been stretched,
it may leak.
13. Tag hoses before disconnecting them:
(a) When disconnecting vacuum hoses, use tags to iden-
tify how they should be reconnected.
(b) After completing a job, double check that the vacuum
hoses are properly connected. A label under the
hood shows the proper layout.
± INTRODUCTIONIN±6General Repair Instructions

PRECAUTIONS FOR VEHICLES EQUIPPED WITH A
CATALYTIC CONVERTER
CAUTION: If large amounts of unburned gasoline flow into the converter, it may overheat
and create a fire hazard. To prevent this, observe the following precautions and
explain them to your customer.
1. Use only unleaded gasoline.
2. Avoid prolonged idling.
Avoid running the engine at idle speed for more than 20
minutes.
3. Avoid spark jump test.
(a) Spark jump test only when absolutely necessary. Perform this test as rapidly as pos-
sible.
(b) While testing, never race the engine.
4. Avoid prolonged engine compression measurement.
Engine compression tests must be made as rapidly as possible.
5. Do not run engine when fuel tank is nearly empty.
This may cause the engine to misfire and create an extra
load on the converter.
6. Avoid coasting with ignition turned off and prolonged braking.
7. Do not dispose of used catalyst along with parts contaminated with gasoline or oil.(f) When steam cleaning an engine, protect the distribu-
tor, air filter and VCV from water.
(g) Never use an impact wrench to remove or install tem-
perature switches or temperature sensors.
(h) When checking continuity at the wire connector, insert
the tester probe carefully to prevent terminals from
bending.
(i) When using a vacuum gauge, never force the hose
onto a connector that is too large. Use a step±down
adapter instead. Once the hose has been stretched,
it may leak.
13. Tag hoses before disconnecting them:
(a) When disconnecting vacuum hoses, use tags to iden-
tify how they should be reconnected.
(b) After completing a job, double check that the vacuum
hoses are properly connected. A label under the
hood shows the proper layout.
± INTRODUCTIONPrecautions for Vehicles Equipped with a Catalytic ConverterIN±6