check engine TOYOTA CAMRY V20 1986 Service Information

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

EFI system problem
Vacuum leak
a PCV line
wEGR tine
wIntake manifold
wAir intake chamber
wThrottle body
wISC valve
wBrake booster fine
Pulling in air between air flow meter and
throttle body
Insufficient fuel flow incorrect ignition tim-
ing
Incorrect valve clearance
Carbon deposits in combustion cham-
bers
Oil leak
PCV line clogged
Piston ring worn or damaged
Valve stem and guide bushing worn
Valve stem oil seal wornRepair as necessary
Check PCV system
Check rings
Check valves and guide bushing
Check seals Troubleshoot fuel system
Reset timing
Adjust valve clearance
Inspect cylinder headRepair as necessary
Check hoses and repair as
necessary Air cleaner clogged
EM system problem
Incorrect ignition timing EFI system problems
Incorrect ignition timing
EGR system faulty
Deceleration fuel cut system always off
Check air cleaner
Repair as necessary
Reset timing Repair as necessary
Reset timing
Check EGR system
EXCESSIVE OIL CONSUMPTION
Engine diesels
(runs after ignition switch
is turned off)
Muffler explosion
(after fire) on
deceleration only
FI±10
IG ±16, 20
EM±11, 15
EM±56, 84 Muffler explosion
(after fire) all the time
AFTER FIRE, BACKFIRE
EC±4, 15
EM±123, 156
EM±57,85
ENGINE DIESELING
Check EFI (fuel cut) system
Excessive oil
consumptionRepair as necessary
IG±16, 20
EC±8, 21
Engine backfires
Possible cause Possible cause
Possible causelG±16, 20 Problem
Problem
RemedyRemedy
ProblemRemedy
Page Page
MA±5Page
± ENGINE MECHANICALTroubleshootingEM±8

Fuel leak
Air cleaner clogged
Incorrect ignition timing
EFI system problems
wInjector faulty
wDeceleration fuel cut system faulty
Idle speed too high
Spark plug faulty
EGR system always on
Low compression
Tires improperly inflated
Clutch slips
Brakes drag
Incorrect idle speed
Incorrect ignition timing
Vacuum leaks
wPCV line
wEGR line
wIntake manifold
wAir intake chamber
wThrottle body
wISC valve
wBrake booster line
EFI system problemsCheck ISC system
Inspect plugs
Check EGR system
Check compression
Inflate tires to proper pressure
Troubleshoot clutch
Troubleshoot brakesRepair as necessary
Check air cleaner
Reset timing
Repair as necessary
EXCESSIVE FUEL CONSUMPTION
Check ISC system
Reset timing
Repair as necessaryFI±116,118
IG±6, 10
EC±8, 21
EM±22
UNPLEASANT ODOR
Poor gasoline
mileage
FI±116, 118
IG±16, 20
Repair as necessaryMA±5
IG±16, 20
Unpleasant odorPossible cause Possible cause
Problem
ProblemRemedy
RemedyPage Page
± ENGINE MECHANICALTroubleshootingEM±9

3. ADJUST VALVE CLEARANCE
(a) Check the only those valves indicated.
wUsing a feeler gauge, measure the clearance between the valve
lifter and camshaft.
wRecord the valve clearance measurements which are out of
specification. They will be used later to determine the required
replacement adjusting shim.
Valve clearance (Cold):
Intake 0.19 ± 0.29 mm (0.007 ± 0.011 in.)
Exhaust 0.28 ± 0.38 mm(0.011 ± 0.015 in.)
(b) Turn the crankshaft one revolution (360°) and align the
mark as above. (See procedure step 2)
(c) Check only the valves indicated as shown.
Measure the valve clearance. (See procedure step (a))
(d) Remove the adjusting shim.
wTurn the crankshaft to position the cam lobe of the cam-
shaft on the adjusting valve upward.
wUsing SST (A), press down the valve lifter and place
SST (B) between the camshaft and valve lifter.
Remove SST (A).
SST 09248±55010
HINT: Before pressing down the valve lifter, position the
notch the spark plug.2. SET NO.1 CYLINDER TO TDC/COMPRESSION
(a) Turn the crankshaft pulley and align its groove with the tim-
ing mark º0º of the No±1 timing belt cover.
(b) Check that the valve lifters, on the No±1 cylinder are loose
and valve lifters on the No.4 are tight.
If not, turn the crankshaft one revolution (360°) and align
the mark as above.
ADJUSTMENT OF VALVE CLEARANCE
(3S±FE)
HINT: Adjust the valve clearance while the engine is cold.
1. REMOVE CYLINDER HEAD COVER
(See step 29 on page EM±52)
± ENGINE MECHANICALEngine Tune±UpEM±11

(e) Determine the replacement adjusting shim size by fol-
lowing the Formula or Charts:
wUsing a micrometer, measure the thickness of the re-
moved shim.
wCalculate the thickness of a new shim so that the valve
clearance comes within specified value.
T ..... Thickness of used shim
A ..... Measured valve clearance
N ..... Thickness of new shim
Intake N = T + (A ± 0.24 mm (0.009 in.))
Exhaust N = T + (A ± 0.33 mm (0±013 in.))
wSelect a new shim with a thickness as close as possible
to the calculated valve.
HINT: Shims are available in twenty±seven sizes of
mm (0.0020 in.), from 2.50 mm (0.0984 in.) to 3.30 mm
A 1299 in.).
(f) Install a new adjusting shim.
wPlace a new adjusting shim on the valve lifter.
wUsing SST 1Ay, press down the valve lifter and remove
SST (B).
SST 09248±55010
(g) Recheck the valve clearance. wRemove the adjusting shim with a small screwdriv-
er and magnetic finger.
4. REINSTALL CYLINDER HEAD COVER
(See step 5 on page EM±70)
± ENGINE MECHANICALEngine Tune±UpEM±12

4. ADJUST VALVE CLEARANCE
(a) Check only those valves indicated in the figure.
wUsing a feeler gauge, measure the clearance between the
valve lifter and camshaft.
wRecord the valve clearance measurements which are out of
specification. They will be used later to determine the re-
quired replacement adjusting shim.
Valve clearance (Cold):
Intake 0.13 ± 0:23 mm (0.005 ± 0.009 in.)
Exhaust 0.27 ± 0.37 mm (0.011 ± 0.015 in.)
(b) Turn the crankshaft 2/3 of a revolution (240°), and check only
the valves indicated in the figure.
Measure the valve clearance.
(See procedure step W)
ADJUSTMENT OF VALVE CLEARANCE
(2VZ±FE)
HINT: Adjust the valve clearance while the engine is cold.
1. REMOVE AIR INTAKE CHAMBER
(See steps 1 to 21 on page FI±76 and 77)
2. REMOVE CYLINDER HEAD COVERS
(See step 32 on page EM±80)
3. SET NO.1 CYLINDER TO TDCI COMPRESSION
(a) Turn the crankshaft pulley, and align its groove with the tim-
ing mark º0º of the No.1 timing belt cover.
(b) Check that the valve lifters on the No. 1 (IN) are loose
and valve lifters on the No.1 (EX) are tight.
If not, turn the crankshaft one revolution (360
°) and align the
mark as above.
(c) Turn the crankshaft a further 2I3 of a revolution
(240°), and check only the valves indicated in the fig-
ure.
Measure the valve clearance.
(See procedure step (a))
± ENGINE MECHANICALEngine Tune±UpEM±15

(e) Determine the replacement adjusting shim size by following
the Formula or Charts:
wUsing a micrometer, measure the thickness of the.
removed shim.
wCalculate the thickness of a new shim so that the.
valve clearance comes within specified value.
T .......... Thickness of used shim
A .......... Measured valve clearance
N .......... Thickness of new shim
Intake N = T + (A ± 0.18 mm (0.007 in.) )
Exhaust N = T + (A ± 0.32 mm (0.013 in.))
wSelect a new. shim with a thickness as close as possible to
the calculated values.
HINT: Shims are available in seventeen sizes of 0.05
mm (0.0020 in.), from 2.50 mm (0.0984 in.) to 3.30 mm
(0.1299 in.).
(f) Install a new adjusting shim.
wPlace a new adjusting shim on the valve lifter.
wPress down the valve lifter with SST (A), and remove SST
(B).
SST 09248±55010
(g) Recheck the valve clearance.
5. REINSTALL CYLINDER HEAD COVERS
(See step 8 on page EM±102)
6. REINSTALL AIR INTAKE CHAMBER
(See steps 18 to 40 pages FI±105 to 106) (d) Remove the adjusting shim.
wTurn the crankshaft to position the cam lobe of the
camshaft on the adjusting valve upward.
wPress down the valve lifter with SST (A), and place
SST (B) between the camshaft and valve lifter.
Remove SST (A).
SST 09248±55010
HINT: Before pressing down the valve lifter, position the
notch the spark plug.
wRemove the adjusting shim with a small screw-
driver and magnetic finger.
± ENGINE MECHANICALEngine Tune±UpEM±16

ADJUSTMENT OF IGNITION TIMING
3S±FE (See steps 7 to 10 on pages IG±16 and 17)
2VZ±FE (See steps 6 to 11 on pages IG±20 and 21)
Ignition timing:
10°BTDC @ idle
(w/ Terminals TE1 and E1 connected)
ADJUSTMENT OF IDLE SPEED (3S±FE)
(See HINT on page FI±17)
1. INITIAL CONDITIONS
(a) Engine at normal operating temperature
(b) Air cleaner installed
(c) All pipes and hoses of air induction system connected
(d) All vacuum lines connected
HINT: All vacuum hoses for EGR systems, etc. should be
properly connected.
(e) EFI system wiring connectors fully plugged
(f) All accessories switched OFF
(g) Transmission in N range
2. CONNECT TACHOMETER (See page IG±16)
3. ADJUST IDLE SPEED
(a) Using SST, connect terminals TE1 and E1 of the check
connector.
SST 09845±18020
HINT: Decrease the rpm after the engine maintains a speed
of the 1,000 ± 1,300 rpm for 5 seconds.
(d) Remove SST.
4. FURTHER CHECK IDLE SPEED
Idle speed: 700
+ 5O rpm
If the idle speed is not within these values, carry out either of
the below listed procedures and then recheck the idle speed.
Carry out a driving test, including stop±go several times at a
speed above 10 km/h, or± start the engine, idle for
30 seconds and then turn the engine 'off repeatedly. By
doing this, idle data will be stored in the ISC and the idle rpm
will be at specified value.(b) Check the idle speed.
Idle speed: 660 rpm or more
(c) If the idle speed is not as specified, adjust the idle speed
by turning the IDLE SPEED ADJUSTING
SCREW.
± ENGINE MECHANICALEngine Tune±UpEM±19

IDLE AND OR 2,500 RPM HC CO
CONCENTRATION CHECK
METHOD
HINT: This check is used only to determine whether or not
the idle HC/CO complies with regulations.
1. INITIAL CONDITIONS
(b) Engine at normal operating temperature
(b) Air cleaner installed
(e) All pipes and hoses of air induction system connected
(d) All operating accessories switched OFF
(e) All vacuum lines properly connected
HINT: All vacuum hoses for EGR systems, etc. should be
properly connected.
(f) EFI system wiring connectors fully plugged
(g) Ignition timing set correctly
(h) Transmission in N range
(i) Tachometer and HC/CO meter calibrated and at hand
2. START ENGINE
3. RACE ENGINE AT 2,500 RPM FOR APPROX. 2
MINUTES
4. INSERT HC/CO METER TESTING PROBE INTO
TAILPIPE AT LEAST 40 cm (1.3 ft)
5. CHECK HC/CO CONCENTRATION AT IDLE
Complete the measuring within three times.
HINT: When performing the 2 mode (2,500 rpm and idle)
test, follow the measurement order prescribed by the regula-
tions.
If the HC/CO concentration at 2,500 rpm does not comply
with regulations, try the following procedure.
Race the engine again at 2,500 rpm for approx. 1 minute
and quickly repeat steps 4 and 5 above.
This may correct the problem.
± ENGINE MECHANICALIdle and or 2 500 rpm HC CO Concentration Check MethodEM±20

Troubleshooting
If the HC/CO concentration does not comply with regula-
tions, perform troubleshooting in the order given below.
(a) Check oxygen sensor operation.
(See page FI±129)
(b) See the table below for possible causes, and then inspect
and correct the applicable causes if necessary.
1. Faulty ignition:
wIncorrect timing
wFouled, shorted or improperly gapped plugs
wOpen or crossed high±tension cords
wCracked distributor cap
2. Incorrect valve clearance
3. Leaky EGR valve
4. Leaky intake and exhaust valves
5. Leaky cylinder
1. Restricted air filter
2. Faulty EFI system
wFaulty pressure regulator
wClogged fuel return line
wDefective water temp. sensor
wDefective air temp. sensor
wFaulty ECU
wFaulty injector
wFaulty cold start injector
wFaulty throttle position sensor
wAir flow meter 1. Vacuum leak:
wPCV hose
wEGR valve
wIntake manifold
wAir intake chamber
wThrottle body
wISC valve
wBrake booster line
2. Lean mixture causing misfire
Rough idle
(Black smoke from exhaust)Rough idle
(Fluctuating HC reading) Rough idleProblem
Normal
Cause
High
High
HighHigh
Low
± ENGINE MECHANICALIdle and or 2 500 rpm HC CO Concentration CheckMethod
EM±21