Page 1287 of 1897
EM-2
- ENGINE MECHANICALCO/HC
986 Author: Date:
2001 AVALON (RM808U)
If the CO/HC concentration does not comply with regulations,
troubleshoot in the order given below.
See the table below for possible causes, and then inspect and
correct the applicable causes if necessary.
COHCProblemsCauses
NormalHighRough idle3. Faulty ignitions:
Incorrect timing
Fouled, shorted or improperly gapped plugs
4. Incorrect valve clearance
5. Leaky intake and exhaust valves
6. Leaky cylinders
LowHighRough idle
(Fluctuating HC reading)1. Vacuum leaks:
PCV hoses
Intake manifold
Air intake chamber
Throttle Body
IAC valve
Brake booster line
2. Lean mixture causing misfire
HighHighRough idle
(Black smoke from exhaust)1. Restricted air filter
2. Plugged PCV valve
3. Faulty SFI systems:
Faulty pressure regulator
Defective ECT sensor
Faulty ECM
Faulty injectors
Faulty throttle position sensor
Faulty MAF meter
Page 1288 of 1897
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)
Page 1319 of 1897
Water Bypass Hose
A10522
PS Pressure Tube
Throttle Body Bracket
Engine WireThrottle Position
Sensor Connector
Vacuum Hose Brake Booster
39 (400,29)
IAC Valve
Connector
Accelerator Cable
Purge Hose
Hose Vacuum
Gasket
VSV Connector for No.2 ACIS
Engine Coolant
Reservoir Hose
43 (440,32)
ECT Sender
Gauge Connector
ECT Sensor
Connector
Grand Strap
Connector
15 (150,11)
Water Outlet
15 (150,11)
Water Bypass
Hose
Upper Radiator
HoseFuel Inlet Hose
Injector Connector Intake Manifold
Assembly
Retainer
Heater Hose
GasketIgnition Coil
Connector
Non-reusable part: Specified torque
N´m (kgf´cm, ft´lbf)
19.5 (200, 14)
No.1 Engine
Hanger
VSV Connector for
EVAP
Ground Cable
PCV Hose Ground Cable
Air Intake Chamber
Assembly
Gasket
Spark PlugIgnition Coil
Ground Strap
DLC1
Gasket
Fuel Hose Clamp
VSV Connector
for No.1 ACIS
Throttle Cable
- ENGINE MECHANICALCYLINDER HEAD
EM-27
1011 Author: Date:
2001 AVALON (RM808U)
Page 1343 of 1897
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.
Page 1351 of 1897
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.
Page 1374 of 1897
EM0CF-02
EM-12
- ENGINE MECHANICALIDLE SPEED
996 Author: Date:
2001 AVALON (RM808U)
IDLE SPEED
INSPECTION
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 accessories switched OFF
(e) All vacuum lines properly connected
(f) SFI system wiring connectors fully plugged
(g) Ignition timing check correctly
(h) Transmission in neutral position
(i) Air conditioning switched OFF
2. CONNECT TOYOTA HAND-HELD TESTER OR OBDII SCAN TOOL (See page EM-10)
3. INSPECT IDLE SPEED
(a) Race the engine speed at 2,500 rpm for approx. 90 seconds.
(b) Check the idle speed.
Idle speed: 650 ± 50 rpm
If the idle speed is not as specified, check the IAC valve and air intake system.
4. DISCONNECT TOYOTA HAND-HELD TESTER OR OBDII SCAN TOOL
Page 1375 of 1897
A10518
5 mm
Hexagon
Wrench
EM15O-01
A10838
TOYOTA
Hand-Held Tester
DLC3
A10536
Lead Wire
A07285
E1DLC1
TE1
DLC1SST
A05184
EM-10
- ENGINE MECHANICALIGNITION TIMING
994 Author: Date:
2001 AVALON (RM808U)
IGNITION TIMING
INSPECTION
1. REMOVE V-BANK COVER
(a) Using a 5 mm hexagon wrench, remove the 3 cap nuts.
(b) Loosen the V-bank cover fastener counterclockwise.
(c) Remove the V-bank cover.
2. WARM UP ENGINE
Allow the engine to warm up to normal operating temperature.
3. CONNECT TOYOTA HAND-HELD TESTER OR OBDII
SCAN TOOL
(a) Connect the TOYOTA hand-held tester or OBDII scan
tool to the DLC3.
(b) Please refer to the TOYOTA hand-held tester or OBDII
scan tool operator's manual for further details.
4. CONNECT TIMING LIGHT TO ENGINE
Connect the clip of a timing light to the lead wire as shown.
5. CHECK IDLE SPEED
(a) Race the engine speed at 2,500 rpm for approx. 90 se-
conds.
(b) Check the idle speed.
Idle speed: 650 ± 50 rpm
6. INSPECT IGNITION TIMING
(a) Using SST, connect terminals TE1 and E1 of the DLC1.
SST 09843-18020
(b) Using a timing light, check the ignition timing.
Ignition timing: 8 - 12° BTDC @ idle
(Transmission in neutral position)
(c) Remove the SST from the DLC1.
SST 09843-18020
Page 1376 of 1897
- ENGINE MECHANICALIGNITION TIMING
EM-1 1
995 Author: Date:
2001 AVALON (RM808U)
7. FURTHER CHECK IGNITION TIMING
Ignition timing: 10 - 25° BTDC @ idle
(Transmission in neutral position)
HINT:
The timing mark moves in a range between 10° and 25°.
8. DISCONNECT TIMING LIGHT FROM ENGINE
9. DISCONNECT TOYOTA HAND- HELD TESTER OR
OBDII SCAN TOOL
10. REINSTALL V-BANK COVER
(a) Using a 5 mm hexagon wrench, install the V-bank cover
with the 3 cap nuts.
(b) Press down the V-bank cover fastener.
