2001 TOYOTA AVALON engine sensor

EM0ZR-02
A10836
 Gasket
 Non-reusable part
N´m (kgf´cm, ft´lbf) : Specified torque Gasket
 Bracket
Front Exhaust Pipe Heat Insulator
Center Exhaust Pipe Gasket Heat Insulator
Heated Oxygen Sensor
(Bank 1 Sensor 2)Tailpipe
Ring Ring
33 (330, 24)
Heat Insulator Heated Oxygen Sensor (Bank 1 Sensor 2)

Before installing the oxygen sensor, twist
the sensor wire counterclockwise 3 and
1/2 turns.
If it is twisted, remove the oxygen sensor
and reinstall it.
After installing the sensor wire is not twisted.HINT:
43 (440, 32)
21 (210, 15)
62 (630, 46)
33 (330, 24)
44 (450, 33)
Stay
Pipe Support
Bracket
39 (400, 29)
22 (220,16)
Pipe Support
Bracket
33 (330, 24)
62 (630, 46)
43 (440, 32)
Compression Spring


Compression Spring
Damper
19 (190, 14)
Heat Insulator
No.1 Exhaust Pipe
Support Bracket
Type A
Type B
Ring
Pipe Support
Bracket
EM-1 10
- ENGINE MECHANICALEXHAUST SYSTEM
1094 Author
: Date
:
2001 AVALON (RM808U)
EXHAUST SYSTEM
COMPONENTS

EM0ZD-02
A05060
Inward
Sensor
A01802
10 mm
Hexagon
Wrench
Plate Washer
A05055
A05061
Fulcrum
Length
SSTSST
RH
- ENGINE MECHANICALTIMING BELT
EM-21
1005 Author
: Date
:
2001 AVALON (RM808U)
INSTALLATION
1. INSTALL CRANKSHAFT TIMING PULLEY
(a) Align the pulley set key with the key groove of the timing
pulley, and slide on the timing pulley.
(b) Install the timing pulley, facing the sensor side inward.
NOTICE:
Do not scratch the sensor part of the crankshaft timing
pulley.
(c) Install the timing belt plate with the bolt.
Torque: 8 N´m (80 kgf´cm, 69 in.´lbf)
2. INSTALL NO.1 IDLER PULLEY
Adhesive: Part No. 08833-00080, THREE BOND 1344,
LOCTITE 242 or equivalent
(a) Using a 10 mm hexagon wrench, install the plate washer
and idler pulley with the pivot bolt.
Torque: 34 N´m (350 kgf´cm, 25 ft´lbf)
(b) Check that the pulley bracket moves smoothly.
3. INSTALL NO.2 IDLER PULLEY
(a) Install the idler pulley with the bolt.
Torque: 43 N´m (440 kgf´cm, 32 ft´lbf)
(b) Check that the idler pulley moves smoothly.
4. INSTALL RH CAMSHAFT TIMING PULLEY
(a) Face the flange side of the timing pulley outward.
(b) Align the knock pin on the camshaft with the knock pin
groove of the timing pulley, and slide on the timing pulley.
(c) Using SST, install the pulley bolt.
SST 09249-63010, 09960-10010 (09962-01000,
09963-01000)
Torque: 88 N´m (900 kgf´cm, 65 ft´lbf)
HINT:
Use a torque wrench with a fulcrum length of 340 mm (13.39
in.).

A01802
10 mm
Hexagon
Wrench
Plate Washer
P20026
SST EM-18
- ENGINE MECHANICALTIMING BELT
1002 Author
: Date
:
2001 AVALON (RM808U)
20. REMOVE NO.1 IDLER PULLEY
Using a 10 mm hexagon wrench, remove the bolt, idler pulley
and plate washer.
21. REMOVE CRANKSHAFT TIMING PULLEY
(a) Remove the bolt and timing belt plate.
(b) Using SST, remove the crankshaft timing pulley.
SST 09950-50012 (09951-05010, 09952-05010,
09953-05010, 09953-05020, 09954-05010)
NOTICE:
Do not scratch the sensor part of the crankshaft timing
pulley.

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:

- INTRODUCTIONFOR ALL OF VEHICLES
IN-17
17 Author
: Date
:
2001 AVALON (RM808U)
2. FOR VEHICLES EQUIPPED WITH A CATALYTIC CONVERTER
CAUTION:
If large amount of unburned gasoline flows into the converter, it may overheat and create a fire haz-
ard. To prevent this, observe the following precautions and explain them to your customer.
(a) Use only unleaded gasoline.
(b) Avoid prolonged idling.
Avoid running the engine at idle speed for more than 20 minutes.
(c) Avoid spark jump test.
(1) Perform spark jump test only when absolutely necessary. Perform this test as rapidly as possible.
(2) While testing, never race the engine.
(d) Avoid prolonged engine compression measurement.
Engine compression tests must be done as rapidly as possible.
(e) 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.
(f) Avoid coasting with ignition turned off.
(g) Do not dispose of used catalyst along with parts contaminated with gasoline or oil.
3. IF VEHICLE IS EQUIPPED WITH MOBILE COMMUNICATION SYSTEM
For vehicles with mobile communication systems such as two-way radios and cellular telephones, observe
the following precautions.
(1) Install the antenna as far as possible away from the ECU and sensors of the vehicle's electronic
system.
(2) Install the antenna feeder at least 20 cm (7.87 in.) away from the ECU and sensors of the ve-
hicle's electronic systems. For details about ECU and sensors locations, refer to the section on
the applicable component.
(3) Avoid winding the antenna feeder together with other wiring as much as possible, and also avoid
running the antenna feeder parallel with other wire harnesses.
(4) Check that the antenna and feeder are correctly adjusted.
(5) Do not install powerful mobile communications system.
4. FOR USING OBD II SCAN TOOL OR TOYOTA HAND-HELD TESTER
CAUTION:
Observe the following items for safety reasons:

Before using the OBD II scan tool or TOYOTA hand-held tester, the OBD II scan tool's instruc-
tion book or TOYOTA hand-held tester's operator manual should be read thoroughly.

Be sure to route all cables securely when driving with the OBD II scan tool or TOYOTA hand-
held tester connected to the vehicle. (i.e. Keep cables away from feet, pedals, steering wheel
and shift lever.)

Two persons are required when test driving with the OBD II scan tool or TOYOTA hand-held
tester, one person to drive the vehicle and the other person to operate the OBD II scan tool or
TOYOTA hand-held tester.

B09711
B09808
B09711
IN-18
- INTRODUCTIONFOR ALL OF VEHICLES
18 Author
: Date
:
2001 AVALON (RM808U)
5. FOR VEHICLES EQUIPPED WITH TRACTION CON-
TROL (TRAC) & VEHICLE SKID CONTROL (VSC) SYS-
TEM
NOTICE:

When replacing the steering angle sensor or ECU, or
when adjusting the front wheel alignment or steering
wheel center point in accordance with the removing
and installing or replacing the suspension, axle, or
steering parts, make sure to perform the steering
angle sensor zero point calibration (See page
DI-252).

Do not remove or install the VSC related parts unless
necessary. Otherwise, there is a possibility that the
setting of the VSC to be affected.

When working on the VSC related operation, make
sure to check that the preparations before and after
work are completed according to the following
instruction.

When using a drum tester such as a speedometer tes-
ter or chassis dynamometer, etc., or jacking up the
front wheels and driving the wheels, always push in
the TRAC & VSC cut (ºVSC OFFº) switch and turn the
TRAC & VSC system OFF.
(a) Press the VSC OFF switch.
(b) Check that the VSC OFF indicator light comes ON.
HINT:
The VSC OFF indicator light should be always OFF when the
engine is restarted.
(c) Begin measurements.
(d) Press the VSC OFF switch again to change the TRAC &
VSC system to operational condition and check that the
VSC OFF indicator light goes off.
HINT:

The SLIP indicator light blinks when the TRAC system is
operational.

The SLIP indicator light blinks and the VSC buzzer
sounds when the VSC system is operational.

DIAGNOSTIC TROUBLE CODE CHECK PROCEDURE
Diagnostic Trouble
Code Check (Make a
note of and then clear)Confirmation
of SymptomsDiagnostic Trouble
Code CheckProblem Condition
Diagnostic Trouble
Code DisplayProblem symptoms
existSame diagnostic
trouble code is
displayedProblem is still occurring in the diagnostic
circuit
Normal code is
displayedThe problem is still occurring in a place
other than in the diagnostic circuit
(The diagnostic trouble code displayed
first is either for a past problem or it is a
secondary problem)
No problem
symptoms existThe problem occurred in the diagnostic
circuit in the past
Normal Code DisplayProblem symptoms
existNormal code is
displayedThe problem is still occurring in a place
other than in the diagnostic circuit
No problem
symptoms existNormal code is
displayedThe problem occurred in a place other
than in the diagnostic circuit in the past
IN-22- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
22 Author
: Date
:
2001 AVALON (RM808U)
2. SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE CHECK
The diagnostic system in the AVALON fulfills various functions. The first function is the Diagnostic Trouble
Code Check in which a malfunction in the signal circuits to the ECU is stored in code in the ECU memory
at the time of occurrence, to be output by the technician during troubleshooting. Another function is the Input
Signal Check which checks if the signals from various switches are sent to the ECU correctly.
By using these check functions, the problem areas can be narrowed down quickly and troubleshooting can
be performed effectively. Diagnostic functions are incorporated in the following systems in the AVALON.
SystemDiagnostic Trouble
Code CheckInput Signal Check
(Sensor Check)Diagnostic Test
Mode (Active Test)
Engine
Automatic Transaxle
Anti-Lock Brake System With Electronic Brake Force Distribution (EBD)
ABS With EBD & BA & TRAC & VSC System
Supplemental Restraint System
Cruise Control System
Engine Immobilizer System
Multiplex Communication System
Air Conditioning System (with Check
Mode)
 (with Check
Mode)











In diagnostic trouble code check, it is very important to determine whether the problem indicated by the diag-
nostic trouble code is still occurring or occurred in the past but returned to normal at present. In addition,
it must be checked in the problem symptom check whether the malfunction indicated by the diagnostic
trouble code is directly related to the problem symptom or not. For this reason, the diagnostic trouble codes
should be checked before and after the symptom confirmation to determine the current conditions, as shown
in the table below. If this is not done, it may, depending on the case, result in unnecessary troubleshooting
for normally operating systems, thus making it more difficult to locate the problem, or in repairs not pertinent
to the problem. Therefore, always follow the procedure in correct order and perform the diagnostic trouble
code check.

V07268
VIBRATION METHOD: When vibration seems to be the major cause.
CONNECTORS
WIRE HARNESS
PARTS AND SENSOR1
Slightly shake the connector vertically and horizontally.
Slightly shake the wire harness vertically and horizontally.
The connector joint, fulcrum of the vibration, and body
through portion are the major areas to be checked thorough-
ly.
Apply slight vibration with a finger to the part of the sensor
considered to be the problem cause and check that the mal-
function occurs.Shake Slightly
Swing Slightly
Vibrate Slightly
HINT:
Applying strong vibration to relays may result in open relays. IN-24
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
24 Author
: Date
:
2001 AVALON (RM808U)
3. SYMPTOM SIMULATION
The most difficult case in troubleshooting is when there are no problem symptoms occurring. In such cases,
a thorough customer problem analysis must be carried out, then simulate the same or similar conditions and
environment in which the problem occurred in the customer's vehicle. No matter how much experience a
technician has, or how skilled he may be, if he proceeds to troubleshoot without confirming the problem
symptoms he will tend to overlook something important in the repair operation and make a wrong guess
somewhere, which will only lead to a standstill. For example, for a problem which only occurs when the en-
gine is cold, or for a problem which occurs due to vibration caused by the road during driving, etc., the prob-
lem can never be determined so long as the symptoms are confirmed with the engine hot condition or the
vehicle at a standstill. Since vibration, heat or water penetration (moisture) is likely cause for problem which
is difficult to reproduce, the symptom simulation tests introduced here are effective measures in that the ex-
ternal causes are applied to the vehicle in a stopped condition.
Important Points in the Symptom Simulation Test:
In the symptom simulation test, the problem symptoms should of course be confirmed, but the problem area
or parts must also be found out. To do this, narrow down the possible problem circuits according to the symp-
toms before starting this test and connect a tester beforehand. After that, carry out the symptom simulation
test, judging whether the circuit being tested is defective or normal and also confirming the problem symp-
toms at the same time. Refer to the problem symptoms table for each system to narrow down the possible
causes of the symptom.