2001 TOYOTA AVALON spark plugs

EM0CC-03
P19471Compression Gauge
- ENGINE MECHANICALCOMPRESSION
EM-3
987 Author
: Date
:
2001 AVALON (RM808U)
COMPRESSION
INSPECTION
HINT:
If there is lack of power, excessive oil consumption or poor fuel
economy, measure the compression pressure.
1. WARM UP AND STOP ENGINE
Allow the engine to warm up to normal operating temperature.
2. REMOVE IGNITION COILS (See page IG-5)
3. REMOVE SPARK PLUGS
Using a 16 mm plug wrench, remove the 6 spark plugs.
4. CHECK CYLINDER COMPRESSION PRESSURE
(a) Insert a compression gauge into the spark plug hole.
(b) Fully open the throttle.
(c) While cranking the engine, measure the compression
pressure.
HINT:
Always use a fully charged battery to obtain engine speed of
250 rpm or more.
(d) Repeat steps (a) through (c) for each cylinder.
NOTICE:
This measurement must be done in as short a time as pos-
sible.
Compression pressure:
1,500 kPa (15.3 kgf/cm
2, 218 psi)
Minimum pressure:
1,000 kPa (10.2 kgf/cm
2, 145 psi)
Difference between each cylinder:
100 kPa (1.0 kgf/cm
2, 15 psi) or less
(e) If the cylinder compression in 1 or more cylinders is low,
pour a small amount of engine oil into the cylinder through
the spark plug hole and repeat steps (a) through (c) for
cylinders with low compression.

If adding oil helps the compression, it is likely that
the piston rings and/or cylinder bore are worn or
damaged.

If pressure stays low, a valve may be sticking or
seating is improper, or there may be leakage past
the gasket.
5. REINSTALL SPARK PLUGS
6. INSTALL IGNITION COILS (See page IG-5)

A05703
Adjusting Shim
Valve Lifter
Keeper
Spring Retainer
Valve Spring
Spring Seat

Oil Seal
Valve
Valve Guide BushingLH Cylinder Head Cover
LH Intake
Camshaft
Snap Ring Camshaft Sub-Gear
LH Exhaust
Camshaft RH Cylinder Head Cover
Gasket
RH Intake
Camshaft Camshaft Sub-Gear
Camshaft Gear Spring
RH Exhaust
CamshaftWave Washer
Semi-Circular PlugSemi-Circular
Plug
LH Cylinder Head
Camshaft
Bearing Cap

Camshaft Oil Seal RH Cylinder Head

RH Cylinder
Head Gasket

LH Cylinder Head Gasket18 (185, 13)x 8
16 (160, 12)
See Page EM-59
1st 54 (550, 40)
2nd Turn 90°
N´m (kgf´cm, ft´lbf) : Specified torque

Non-reusable part

Spark Plug
Tube Gasket
Wave WasherGasketSnap RingCamshaft Gear Spring
Oil Control Valve Filter

Gasket
Camshaft Timing
Gear (VVT-i)

Gasket

Gasket
Oil Control
Valve FilterCylinder Head
Rear CoverCylinder Head
Rear Cover
Gasket
150 (1,530, 110)
NOTICE:
Intake Camshaft
Do not remove or install the camshaft timing
gear (VVT-i) beside changing VVT-i or the
camshaft.


EM-30
- ENGINE MECHANICALCYLINDER HEAD
1014 Author
: Date
:
2001 AVALON (RM808U)

A05194
L = 133 mm (5.24 in.)
L = 180 mm (7.09 in.)L = 72 mm (2.83 in.)
L = 335 mm (13.19 in.)L = 180 mm
(7.09 in.)
L = Length Join
LineJoin
Line
Z14262New Gasket
- ENGINE MECHANICALCYLINDER HEAD
EM-67
1051 Author
: Date
:
2001 AVALON (RM808U)

Thoroughly clean all components to remove all the
loose material.

Remove the backing paper from a new gasket and
install the gasket evenly to the part of the timing belt
cover shaded black in the illustration.
NOTICE:
When joining 2 gaskets, do not leave a gap between them.
Cut off any excess gasket.

After installing the gasket, press down on it so that
the adhesive firmly sticks to the timing belt cover.
(b) Install the timing belt cover with the 6 bolts.
Torque: 8.5 N´m (85 kgf´cm, 74 in.´lbf)
(c) Install the 3 engine wire clamps to the timing belt cover.
20. INSTALL NO.2 IDLER PULLEY (See page EM-21)
21. INSTALL CAMSHAFT TIMING PULLEYS
(See page EM-21)
22. INSTALL TIMING BELT (See page EM-21)
23. INSTALL SPARK PLUGS
24. INSTALL IGNITION COILS
25. INSTALL WATER OUTLET
(a) Install 2 new gaskets.
(b) Connect the water outlet to the bypass hose.
(c) Install the water outlet with the 2 bolts, 2 nuts and 2 plate
washers. Alternately tighten the bolts and nuts.
Torque: 15 N´m (150 kgf´cm, 11 ft´lbf)
NOTICE:
Do not scratch the seal surface of the water outlet with the
stud bolt.
(d) Connect the ECT sender gauge connector.
(e) Connect the ECT sensor connector.
(f) Connect the ground strap connector.
(g) Connect the upper radiator hose.
(h) Connect the engine coolant reservoir hose.

A07428
P20049Gasket
A05077
Clamp
Clamp
Clamp
A10531
- ENGINE MECHANICALCYLINDER HEAD
EM-33
1017 Author
: Date
:
2001 AVALON (RM808U)
(d) Remove the 9 bolts, 2 nuts, 2 plate washers, the intake
manifold, delivery pipes and injectors assembly.
NOTICE:

Be careful not to drop the injectors when removing
the delivery pipes.

Pay attention to put any hung load on the injector to
and from the side direction.
10. REMOVE WATER OUTLET
(a) Disconnect the ECT sender gauge connector.
(b) Disconnect the ECT sensor connector.
(c) Disconnect the ground strap connector.
(d) Disconnect the upper radiator hose.
(e) Disconnect the engine coolant reservoir hose.
(f) Remove the 2 bolts, 2 nuts and 2 plate washers.
(g) Disconnect the water bypass hose, and remove the water
outlet.
(h) Remove the 2 gaskets.
11. REMOVE IGNITION COILS
12. REMOVE SPARK PLUGS
13. REMOVE TIMING BELT (See page EM-15)
14. REMOVE CAMSHAFT TIMING PULLEYS
(See page EM-15)
15. REMOVE NO.2 IDLER PULLEY (See page EM-15)
16. REMOVE NO.3 TIMING BELT COVER
(a) Disconnect the 3 engine wire clamps from the timing belt
cover.
(b) Remove the 6 bolts and timing belt cover.
17. REMOVE CAMSHAFT POSITION SENSORS
18. REMOVE CAMSHAFT TIMING OIL CONTROL VALVES
19. DISCONNECT ENGINE WIRE PROTECTOR FROM
REAR SIDE
Remove the nut, and disconnect the engine wire protector from
the RH cylinder head.

IG0DL-02
SPARK TEST
CHECK CONNECTIONS OF IGNITION COIL (WITH
CHECK POWER SUPPLY TO IGNITION COILS (WITH
1. Turn ignition switch to ON.
2. Check that there is battery positive voltage at ignition
CHECK RESISTANCE OF SENSORS
Resistance: Cold Hot
Camshaft position sensor
Crankshaft position sensor835 - 1,400 W
1,630 - 2,740 W1,060 - 1,645 W
2,065 - 3,225 W
CHECK IGT SIGNAL FROM ECM (See page DI-1 17)
TRY ANOTHER IGNITION COIL (WITH IGNITER) IGNITER) CONNECTORS
coil positive (+) terminal.
(See steps 4 and 5)NO
OK
NO
OK
OK
BAD
OK
BAD
BAD
BAD
Connect securely.
Replace ignition coil (with igniter).
Check wiring between ignition switch to
Replace camshaft position sensor.
Check wiring between ECM and ignition ignition coils (with igniters).
coils (with igniters), and then try another CHANGE IT TO NORMAL IGNITION COIL (WITH IGNITER)
AND PERFORM SPARK TEST AGAIN
Replace crankshaft position sensor.
ECM. OK IGNITER)
- IGNITIONIGNITION SYSTEM
IG-1
1244 Author
: Date
:
2001 AVALON (RM808U)
IGNITION SYSTEM
ON-VEHICLE INSPECTION
NOTICE:
ºColdº and ºHotº in these sentences express the tempera-
ture of the coils themselves. ºColdº is from -10°C (14°F) to
50°C (122°F) and ºHotº is from 50°C (122°F) to 100°C
(212°F).
1. INSPECT SPARK TEST
Check that the spark occurs.
(1) Remove the ignition coils (with igniters) (See page
IG-5).
(2) Remove the spark plugs.
(3) Install the spark plug to the ignition coil, and connect
the ignition coil connector.
(4) Ground the spark plug.
(5) See if spark occurs while engine is being cranked.
NOTICE:
To prevent gasoline from being injected from injectors dur-
ing this test, crank the engine for no more than 5 - 10 se-
conds at time.
If the spark does not occur, do the test as follows:

IG0147
Megger
Ground
B02629
P13225
16 mm Plug
Wrench
B02630
1.1 mm IG-2
- IGNITIONIGNITION SYSTEM
1245 Author
: Date
:
2001 AVALON (RM808U)
2. INSPECT SPARK PLUGS
NOTICE:

Never use a wire brush for cleaning.

Never attempt to adjust the electrode gap on a used
spark plug.

Spark plugs should be replaced every 193,000 km
(120,000 miles).
(a) Remove the 6 ignition coils (with igniters) (See page
IG-5).
(b) Inspect the electrode.

Using a megger (insulation resistance meter), mea-
sure the insulation resistance.
Standard correct insulation resistance:
10 MW or more
If the resistance is less than specified, proceed to step (d).
HINT:
If a megger is not available, these simple method of inspection
provides fairly accurate results.

Simple Method:

Quickly race the engine to 4,000 rpm 5 times.

Remove the spark plug (See step (c)).

Visually check the spark plug.
If the electrode is dry ... OK
If the electrode is wet ... Proceed to step (d)

Reinstall the spark plug (See step (g)).
(c) Using a 16 mm plug wrench, remove the 6 spark plugs.
(d) Visually check the spark plug for thread damage and insu-
lator damage.
If abnormal, replace the spark plug.
Recommended spark plug:
DENSO madeSK20R11
NGK madeIFR6A11
(e) Inspect the electrode gaps.
Maximum electrode gap for used spark plug:
1.3 mm (0.051 in.)
If the gap is greater than maximum, replace the spark plug.
Correct electrode gap for new spark plug:
1.1 mm (0.043 in.)
NOTICE:
If adjusting the gap of a new spark plug, bend only the base
of the ground electrode. Do not touch the tip. Never attempt
to adjust the gap on the used plug.

IG0152
B06521
Ohmmeter
P14244
Ohmmeter
- IGNITIONIGNITION SYSTEM
IG-3
1246 Author
: Date
:
2001 AVALON (RM808U)
(f) Clean the spark plugs.
If the electrode has traces of wet carbon, allow it to dry and then
clean with a spark plug cleaner.
Air pressure: Below 588 kPa (6 kgf/cm
2, 85 psi)
Duration: 20 seconds or less
HINT:
If there are traces of oil, remove it with gasoline before using the
spark plug cleaner.
(g) Using a 16 mm plug wrench, install the 6 spark plugs.
Torque: 18 N´m (180 kgf´cm, 13 ft´lbf)
(h) Reinstall the 6 ignition coil (See page IG-5).
3. INSPECT IGNITION COILS (WITH IGNITERS)
(See step 1.)
4. INSPECT CAMSHAFT POSITION SENSORS
(a) Remove the V-bank cover.
(b) Remove the air cleaner hose w/ resonator.
(c) Disconnect the sensor connectors.
(d) Using an ohmmeter, measure the resistance between ter-
minals.
Resistance:
Cold835 - 1,400 W
Hot1,060 - 1,645 W
If the resistance is not as specified, replace the sensor.
(e) Reconnect the sensor connectors.
(f) Reinstall the air cleaner hose w/ resonator.
(g) Reinstall the V-bank cover.
5. INSPECT CRANKSHAFT POSITION SENSOR
(a) Remove the sensor (See page IG-9).
(b) Using an ohmmeter, measure the resistance between the
terminals.
Resistance:
Cold1,630 - 2,740 W
Hot2,065 - 3,225 W
If the resistance is not as specified, replace the sensor.
(c) Reinstall the sensor (See page IG-9).

MA01M-02
P00495
Inside Outside
- MAINTENANCEENGINE
MA-5
47 Author
: Date
:
2001 AVALON (RM808U)
ENGINE
INSPECTION
HINT:
Inspect these items when the engine is cold.
1. REPLACE TIMING BELT (See page EM-15)
2. INSPECT DRIVE BELTS
(See pages CH-1, SR-3 and AC-17)
3. REPLACE SPARK PLUGS (See page IG-1)
4. INSPECT AIR FILTER
(a) Visually check that the air filter is not excessively dirty or
oily.
(b) Clean the air filter with compressed air.
First blow from the inside thoroughly, then blow off the
outside of the air filter.
5. REPLACE AIR FILTER
Replace the air filter with a new one.
6. REPLACE ENGINE OIL AND OIL FILTER
(See page LU-3)
7. REPLACE ENGINE COOLANT (See page CO-2)
8. REPLACE GASKET IN FUEL TANK CAP
(See page EC-6)
9. INSPECT FUEL LINES AND CONNECTIONS
(See page EC-6)
10. INSPECT EXHAUST PIPES AND MOUNTINGS
(See page EC-14)
11. ADJUST VALVE CLEARANCE (See page EM-4)