2001 TOYOTA AVALON engine sensor

DTC No.
Indicates the diagnostic trouble code.

Page or Instructions
Indicates the page where the inspection procedure
for each circuit is to be found, or gives instructions
for checking and repairs.

Detection Item
Indicates the system of the problem or
contents of the problem.
Trouble Area
Indicates the suspect area of the
problem.
Mass Air Flow Circuit MalfunctionDetection Item

Open or short in mass air flow meter circuit

Mass air flow meter

ECM DTC No.
(See page)Trouble AreaMIL* MemoryP0100
(DI-24)
P0101
(DI-28)
P0115
(DI-33)
Open or short in intake air temp. sensor
circuit

Intake air temp. sensor

ECM Intake Air Temp. Circuit
Malfunction P0110
(DI-29)

Open or short in engine coolant temp. sensor circuit

Engine coolant temp. sensor

ECM
Throttle/ Pedal Position Sensor/Switch
ºAº Circuit MalfunctionEngine Coolant Temp.
Circuit Malfunction

Open or short in throttle position sensor circuit

Throttle position sensor

ECM
DTC CHART (SAE Controlled)
HINT:
Parameters listed in the chart may not be exactly the same as your reading due to the type of instrument or other
factors.
If a malfunction code is displayed during the DTC check mode, check the circuit for that code listed in the table
below. For details of each code, turn to the page referred to under the ºSee pageº for the respective ºDTC No.º
in the DTC chart.
Mass Air Flow Circuit
Range/ Performance Problem
Mass air flow meter

Throttle position sensor Throttle/ Pedal Position Sensor/ Switch
ºAº Circuit Range / Performance Prob-
lem P0116
(DI-37)Engine Coolant Temp.
Circuit Range/ Performance Problem
Engine coolant temp. sensor

Cooling system
IN-26- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
26 Author
: Date
:
2001 AVALON (RM808U)
4. DIAGNOSTIC TROUBLE CODE CHART
The inspection procedure is shown in the table below. This table permits efficient and accurate troubleshoot-
ing using the diagnostic trouble codes displayed in the diagnostic trouble code check. Proceed with trouble-
shooting in accordance with the inspection procedure given in the diagnostic chart corresponding to the
diagnostic trouble codes displayed. The engine diagnostic trouble code chart is shown below as an example.

V08423 Knock Sensor 1
GRECM
KNK
E1 12
E6
WIRING DIAGRAM
Wiring Diagram
This shows a wiring diagram of the circuit.
Use this diagram together with ELECTRICAL
WIRING DIAGRAM to thoroughly understand the
circuit.
Wire colors are indicated by an alphabetical code.
B = Black, L = Blue, R = Red, BR = Brown,
LG = Light Green, V = Violet, G = Green,
O = Orange, W = White, GR = Gray, P = Pink,
Y = Yellow, SB = Sky Blue
The first letter indicates the basic wire color and
the second letter indicates the color of the stripe.
DTC P0325Knock Sensor 1 Circuit Malfunction
CIRCUIT DESCRIPTION
Knock sensor is fitted to the cylinder block to detect engine knocking. This sensor contains a piezoelectric element which
generates a voltage when it becomes deformed, which occurs when the cylinder block vibrates due to knocking. If engine
knocking occurs, ignition timing is retarded to suppress it.
DTC No. DTC Detecting Condition Trouble Area
P0325No knock sensor 1 signal to ECM with engine speed,
1,200 rpm or more.
Open or short in knock sensor1 circuit

Knock sensor 1 (looseness)

ECM
If the ECM detects the above diagnosis conditions, it operates the fall safe function in which the corrective retard angle
value is set to the maximum value.

Diagnostic Trouble Code No. and Detection Item

Circuit Description
The major role and operation, etc. of the circuit
and its component parts are explained.

Indicates the diagnostic trouble code, diagnostic
trouble code set parameter and suspect area of
the problem.

IN-28
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
28 Author
: Date
:
2001 AVALON (RM808U)
6. CIRCUIT INSPECTION
How to read and use each page is shown below.

IN0253
WRONG CORRECT
IN0252
WRONG CORRECT IN-6
- INTRODUCTIONREPAIR INSTRUCTIONS
6 Author
: Date
:
2001 AVALON (RM808U)
(k) Care must be taken when jacking up and supporting the
vehicle. Be sure to lift and support the vehicle at the prop-
er locations (See page IN-8).
Cancel the parking brake on the level place and
shift the transmission in Neutral (or N position).
When jacking up the front wheels of the vehicle at
first place stoppers behind the rear wheels.
When jacking up the rear wheels of the vehicle at
first place stoppers before the front wheels.
When either the front or rear wheels only should be
jacked up, set rigid racks and place stoppers in front
and behind the other wheels on the ground.
After the vehicle is jacked up, be sure to support it
on rigid racks . It is extremely dangerous to do any
work on a vehicle raised on a jack alone, even for
a small job that can be finished quickly.
(l) Observe the following precautions to avoid damage to the
following parts:
(1) Do not open the cover or case of the ECU unless
absolutely necessary. (If the IC terminals are
touched, the IC may be destroyed by static electric-
ity.)
(2) To disconnect vacuum hoses, pull off the end, not
the middle of the hose.
(3) To pull apart electrical connectors, pull on the con-
nector itself, not the wires.
(4) Be careful not to drop electrical components, such
as sensors or relays. If they are dropped on a hard
floor, they should be replaced and not reused.
(5) When steam cleaning an engine, protect the elec-
tronic components, air filter and emission-related
components from water.
(6) Never use an impact wrench to remove or install
temperature switches or temperature sensors.

IN-38
- INTRODUCTIONTERMS
38 Author
: Date
:
2001 AVALON (RM808U) OEM
Original Equipment Manufacturing
OHCOverhead Camshaft
OHVOverhead Valve
OPTOption
O/SOversize
P & BVProportioning And Bypass Valve
PCSPower Control System
PCVPositive Crankcase Ventilation
PKBParking Brake
PPSProgressive Power Steering
PSPower Steering
PTOPower Take-Of f
R & PRack And Pinion
R/BRelay Block
RBSRecirculating Ball Type Steering
R/FReinforcement
RFSRigid Front Suspension
RRSRigid Rear Suspension
RHRight-Hand
RHDRight-Hand Drive
RLYRelay
ROMRead Only Memory
RrRear
RRRear-Engine Rear-Wheel Drive
RWDRear-Wheel Drive
SDNSedan
SENSensor
SICSStarting Injection Control System
SOCState Of Charge
SOHCSingle Overhead Camshaft
SPECSpecification
SPISingle Point Injection
SRSSupplemental Restraint System
SSMSpecial Service Materials
SSTSpecial Service Tools
STDStandard
STJCold-Start Fuel Injection
SWSwitch
SYSSystem
T/ATransaxle
TACHTachometer
TBIThrottle Body Electronic Fuel Injection
TCTurbocharger
TCCSTOYOTA Computer-Controlled System
TCVTiming Control Valve
TDCTop Dead Center

- INTRODUCTIONTERMS
IN-41
41 Author
: Date
:
2001 AVALON (RM808U) HO2S
Heated Oxygen SensorHeated Oxygen Sensor (HO2S)
IACIdle Air ControlIdle Speed Control (ISC)
IATIntake Air TemperatureIntake or Inlet Air Temperature
ICMIgnition Control Module-
IFIIndirect Fuel InjectionIndirect Injection (IDL)
IFSInertia Fuel-Shutoff-
ISCIdle Speed Control-
KSKnock SensorKnock Sensor
MAFMass Air FlowAir Flow Meter
MAPManifold Absolute PressureManifold Pressure
Intake Vacuum
MCMixture Control
Electric Bleed Air Control Valve (EBCV)
Mixture Control Valve (MCV)
Electric Air Control Valve (EACV)
MDPManifold Differential Pressure-
MFIMultiport Fuel InjectionElectronic Fuel Injection (EFI)
MILMalfunction Indicator LampCheck Engine Lamp
MSTManifold Surface Temperature-
MVZManifold Vacuum Zone-
NVRAMNon-V olatile Random Access Memory-
O2SOxygen SensorOxygen Sensor, O2 Sensor (O2S)
OBDOn-Board DiagnosticOn-Board Diagnostic System (OBD)
OCOxidation Catalytic ConverterOxidation Catalyst Convert (OC), CCo
OPOpen LoopOpen Loop
PAIRPulsed Secondary Air InjectionAir Suction (AS)
PCMPowertrain Control Module-
PNPPark/Neutral Position-
PROMProgrammable Read Only Memory-
PSPPower Steering Pressure-
PTOXPeriodic Trap OxidizerDiesel Particulate Filter (DPF)
Diesel Particulate Trap (DPT)
RAMRandom Access MemoryRandom Access Memory (RAM)
RMRelay Module-
ROMRead Only MemoryRead Only Memory (ROM)
RPMEngine SpeedEngine Speed
SCSuperchargerSupercharger
SCBSupercharger BypassE-ABV
SFISequential Multiport Fuel InjectionElectronic Fuel Injection (EFI), Sequential Injection
SPLSmoke Puff Limiter-
SRIService Reminder Indicator-
SRTSystem Readiness Test-
STScan Tool-
TBThrottle BodyThrottle Body
TBIThrottle Body Fuel InjectionSingle Point Injection
Central Fuel Injection (Ci)
TCTurbochargerTurbocharger
TCCTorque Converter ClutchTorque Converter

B08905
N´m (kgf´cm, ft´lbf): Specified torque
 Non-reusable partNo.3 Timing Belt Cover
Gasket
BushingCollar
A/C Compressor
Housing Bracket
Oil Pan Baffle Plate Crankshaft
Position Sensor
Connector Crankshaft
Position
Sensor
Oil PumpEngine Wire
Oil Strainer
No.2 Oil Pan
x 10x 6
x 9 O-Ring
No.1 Oil Pan
 Gasket
Drain Plug
8.5 (85, 74 in.´lbf)
8 (80, 69 in.´lbf)
8 (80, 69 in.´lbf)
10 mm Head 8 (80, 69 in.´lbf)
12 mm Head 19.5 (200, 14)
10 mm Head 8 (80, 69 in.´lbf)
12 mm Head 19.5 (200, 14)
14 mm Head 37.2 (380, 27)
8 (80, 69 in.´lbf)
45 (460, 33)
8 (80, 69 in.´lbf)
x 6
x 17
 Gasket
19.5 (200, 14)
No.1 Exhaust Pipe
Support Bracket
- LUBRICATIONOIL PUMP
LU-7
1232 Author
: Date
:
2001 AVALON (RM808U)

- PREPARATIONENGINE MECHANICAL
PP-3
53 Author
: Date
:
2001 AVALON (RM808U)
09249-63010Torque Wrench AdaptorRH camshaft timing pulley
09330-00021Companion Flange Holding ToolCrankshaft pulley
09608-03071ReplacerSpark plug tube gasket
09816-30010Oil Pressure Switch SocketKnock sensor
09843-18020Diagnosis Check Wire
09950-50012Puller C Set
(09951-05010)Hanger 150Crankshaft pulley
Crankshaft timing pulley
(09952-05010)Slide ArmCrankshaft pulley
Crankshaft timing pulley
(09953-05010)Center Bolt 100Crankshaft pulley
Crankshaft timing pulley
(09953-05020)Center Bolt 150Crankshaft pulley
Crankshaft timing pulley
(09954-05010)Claw No.1Crankshaft timing pulley
(09954-05020)Claw No.2Crankshaft pulley
09950-70010Handle Set

SS0BM-04
- SERVICE SPECIFICATIONSAUTOMATIC TRANSAXLE
SS-25
141 Author
: Date
:
2001 AVALON (RM808U)
TORQUE SPECIFICATION
Part tightenedN´mkgf´cmft´lbf
Front side engine mounting insulator x Front frame assembly8082059
Rear engine mounting insulator x Front frame assembly6667048
LH transaxle mounting insulator x Front frame assembly8082059
Engine mounting insulator x Front frame assembly4849035
Transaxle x Engine 17 mm bolt
14 mm bolt66
48670
49048
35
Torque converter clutch x Drive plate4142030
Valve body x Transaxle case1111 08
Oil strainer x Valve body Bolt A
(See page AX-35) Bolt B10
11100
11 07
8
Oil pan x Transaxle case7.88069 in.´lbf
Oil pan drain plug4950036
Park/Neutral position switch x Transaxle case Bolt
Nut5.4
6.955
7048 in.´lbf
61 in.´lbf
Connector clamp x Valve body6.66758 in.´lbf
Manual valve body x Transaxle case1111 08
Line pressure test plug x Transaxle case7.58069 in.´lbf
Detent spring x Manual valve body1111 08
Oil pipe bracket x Transaxle case101007
Steering gear housing x Front frame assembly1811,850134
Stabilizer bar bracket x Front frame assembly1919514
Stabilizer bar link x Stabilizer bar3940029
Lower suspension arm x Lower ball joint1271,30094
Tie rod end x Steering knuckle4950036
Drive shaft lock nut2943,000217
Direct clutch speed sensor x Transaxle case1111 08
Exhaust manifold bracket x Transaxle case2020015
Exhaust manifold plate2020015
Front frame assembly x Body 19 mm bolt
14 mm bolt
Nut181
32
361,850
330
370134
24
27
Front exhaust pipe x Exhaust center pipe4344032
Exhaust manifold x Front exhaust pipe6263046
Exhaust front pipe support stay x Exhaust front pipe support bracket3333024
Starter x Torque converter clutch housing3940029
Transaxle control shaft lever x Park/neutral position switch1515011
Throttle cable adjusting nut1515011
Drive plate x Crankshaft8385061
Shift control cable x Transaxle control shaft lever1515011
Throttle cable retaining plate set bolt5.45548 in.´lbf
Shift solenoid valve No. 1, No. 2, SL, SLN x Valve body6.66758 in.´lbf
Front wheel nut1031,05076
Exhaust front pipe support bracket x Body2121015
PS reservoir pipe x Front frame101007