engine overheat TOYOTA CELICA 1987 Service Repair Manual

co-4 CQOLING SYSTEM - Troubleshootmg
TROUBLESHOOTING
, Problem
Engine overheats Possible cause
Alternator drive belt loose or missing
Dirt, leaves or insects in radiator or
condenser
Hoses, water pump, water outlet
housing, radiator, heater, core plugs
or head gasket leakage
Thermostat faulty
Ignition timing
retarded
Fluid coupling faulty
Radiator hose plugged or rotted
Water pump faulty
Radiator plugged or cap faulty
Cylinder head or block cracked or
phwd Remedy
Adjust or replace belt
Clean radiator or condenser
Repair as necessary
Check thermostat
Set timing
Replace fluid coupling
Replace hose
Replace water pump
Check radiator
Repair as necessary Page
CH-4
CO-8
EM-l 7
CO-6
CO-6
co-9

LM-4
I ENGINE MECHANICAL -* Troubleshooting
_.
TROUBLESHOOTING
Problem Possible cause I Remedy Page
Engine overheats Cooling system faulty Troubleshoot cooling system co-4
Incorrect ignition timing Reset timing EM-1 7
Engine will not crank or Starting system faulty Troubleshoot starting system ST-2
cranks slowly : .
Engine will not start/ Vacuum leaks Repair as necessary
hard to start 0 PCV hoses ”
(cranks OK) 0 (w/ EGR)
EGR valve
0 Intake manifold
0 Air intake chamber
0 Throttle body
0 ISC valve
Pulling in air between air flow meter and Repair as necessary FI-96, 93
throttle body
Ignition problems Perform spark test IG-5, 12
0 Ignition coil
0 Igniter
0 (7M-GE)
Distributor
(7M-GTE)
Cam position sensor
High-tension cord disconnected or broken Inspect cord IG-6, 13
No fuel supply to injector Troubleshoot EFI system FI-I 2
l No fuel in tank
0 Fuel pump not working
l Fuel filter clogged
0 Fuel line clogged or leaking
EFI system problems Repair as necessary
ISC system problem Check ISC system FL- 108
Spark plugs faulty Inspect plugs IG-7
Low compression Check compression EM-26, 2
Rough idle, stalls or Vacuum leaks Repair as necessary
misses 0 PCV hoses
0 (w/ EGR)
EGR valve
0 Intake manifold
0 Air intake chamber
0 Throttle body I
0 ISC valve
Pulling in air between sir flow meter and FI-96, 9
throttle body
Incorrect idle speed Check ISC system FI- 108
Incorrect ignition timing Reset timing EM-1 7
Ignition problems Perform spark test IG-5, 12
0 Ignition coil
0 Igniter
0 (-/M-GE)
Distributor
(-/M-GTE)
Cam position sensor
High-tension cord faulty Inspect cord IG-6, 13
EFI system problems Repair as necessary

ENGtNE MECHANKAL - Troubleshootinn EM-S
TROUBLESHOOTING (Cont’d)
-.
Problem Possible cause Remedy Page
sough idle, stalls or Spark plugs faulty Inspect plugs IG-7
misses (cont’d)
Engine overheats Check cooling system ’ co-4
Low compression Check compression EM-26, 2;
Engine hesitates/ Vacuum leaks Repair as necessary
poor acceleration 0 PCV hoses
. (w/ EGR)
EGR valve
0 Intake manifold
’ 0 Air intake chamber .c
0 Throttle body
0 ISC valve
Pulling in air between air flow meter and Repair as necessary FI-96, 96
throttle body
Incorrect ignition timing Reset timing _ EM-1 7
Emission control system problem
(cold engine)
0 (w/ EGR)
EGR system always on Check EGR system
High-tension cord faulty Inspect cord 1G-6,
Fuel system clogged Check fuel system FI-7
Air cleaner clogged Check air cleaner EM-7
EFI system problems Repair as necessary
Spark plugs faulty Inspect plugs IG-7
Engine overheats Check cooling system co-4
Low compression Check compression EM-26, 2
Engine diesels EFI system problems Repair as necessary
(runs after ignition
switch is turned off)
Muffler explosion Deceleration fuel cut system always off Check EFI (fuel cut) system FI-128
(after fire) on
deceleration only
Muffler explosion Air cleaner clogged Check air cleaner EM-7
(after fire) all the time
EFI system problem Repair as necessary
incorrect ignition timing Reset timing EM-l.7
Engine backfires Vacuum leak Check hoses and repair as
l PCV hoses necessary
. (w/ EGR)
EGR valve c
0 Intake manifold
0 Air intake chamber
l Throttle body
0 ISC valve
Pulling in air between air flow meter and Repair as necessary Fl-96, 91
throttle body
EFI system problem Repair as necessary
Insufficient fuel flow Troubleshoot fuel system
Incorrect ignition timing Reset timing EM-l 7
Carbon deposits in combustion chambers Inspect cylinder head EM-97

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Problem
Engine will not star-t/
hard to start
(cranks OK)
Rough idle or stalls
Engine hesitates/
poor acceleration
Muffler explosion
(after fire) all the
time
Engine backfires
Poor fuel economy
Engine overheats
TROUBLESHOOTING
Possible causes
Incorrect ignition timing
Ignition problems
0 Ignition coil
. (7M-GTE)
Igniter
. (7M-GE)
Distributor
(7M-GTE)
Cam position sensor
l High-tension cords
Ignition wiring disconnected
or broken
Spark plugs faulty
Ignition wiring faulty
Incorrect ignition timing
Ignition problems
0 Ignition coil
. I7M-GTE)
Igniter
. (7M-GE)
Distributor
(7M-GTE)
Cam position sensor
0 High-tension cords
Spark plugs faulty
Ignition wiring faulty
Incorrect ignition timing
Incorrect ignition timing
Incorrect ignition timing
Spark plugs faulty
Incorrect ignition timing
Incorrect ignition timing Remedy
Reset timing
lrkpect coil
Inspect igniter
Inspect distributor
Inspect cam position sensor
Inspect high-tension cords
Inspect wiring
Inspect plugs
Inspect wiring
Reset timing
Inspect coil
Inspect igniter
Inspect distributor
Inspect cam position sensor
Inspect high-tension cords
Inspect plugs
Inspect wiring
Reset timing
Reset timing
Reset timing
Inspect plugs
Reset timing
Reset timing =
Page-.. :
-
EM-17
IG-10 or 14
IG-17
IG-11
IG-1%
IG-6 or 13
IG-7
EM-l 7
IG-10 or 11
IG-17
IG-I 1
IG-18
IG-6 or 13
IG-7
EM-l 7
EM-1 7