2005 TOYOTA AVENSIS catalytic converter

01±14
± INTRODUCTIONTERMS
1AZ±FSE ENGINE REPAIR MANUAL (RM1019E) TCM
Transmission Control ModuleTransmission ECU, ECT ECU
TPThrottle PositionThrottle Position
TRTransmission Range±
TVVThermal Vacuum ValveBimetallic Vacuum Switching Valve (BVSV)
Thermostatic Vacuum Switching Valve (TVSV)
TWCThree±Way Catalytic Converter
Three±Way Catalytic (TWC)
Manifold Converter
CC
RO
TWC+OCThree±Way + Oxidation Catalytic ConverterCCR + CCo
VA FVolume Air FlowAir Flow Meter
VRVoltage RegulatorVoltage Regulator
VSSVehicle Speed SensorVehicle Speed Sensor
WOTWide Open ThrottleFull Throttle
WU±OCWarm Up Oxidation Catalytic Converter±
WU±TWCWarm Up Three±Way Catalytic Converter±
3GRThird Gear±
4GRFourth Gear±

010B9±09
± INTRODUCTIONTERMS
01±7
1AZ±FSE ENGINE REPAIR MANUAL (RM1019E)
TERMS
ABBREVIATIONS USED IN THIS MANUAL
AbbreviationsMeaning
ABSAnti±Lock Brake System
A/CAir Conditioner
ACAlternating Current
ACCAccessory
ACISAcoustic Control Induction System
ACSDAutomatic Cold Start Device
A.D.D.Automatic Disconnecting Differential
A/FAir±Fuel Ratio
AHCActive Height Control Suspension
ALRAutomatic Locking Retractor
ALTAlternator
AMPAmplifier
ANTAntenna
Approx.Approximately
ASSYAssembly
A/T, ATMAutomatic Transmission (Transaxle)
AT FAutomatic Transmission Fluid
AUTOAutomatic
AUXAuxiliary
AV GAverage
AV SAdaptive Variable Suspension
B+Battery Voltage
BABrake Assist
BACSBoost Altitude Compensation System
BATBattery
BDCBottom Dead Center
B/LBi±Level
B/SBore±Stroke Ratio
BTDCBefore Top Dead Center
BVSVBimetallic Vacuum Switching Valve
CBCircuit Breaker
CCoCatalytic Converter For Oxidation
CDCompact Disc
CFCornering Force
CGCenter Of Gravity
CHChannel
CKDComplete Knock Down
COMB.Combination
CPECoupe
CPSCombustion Pressure Sensor
CPUCentral Processing Unit
CRSChild Restraint System
CTRCenter
C/VCheck Valve
CVControl Valve
CWCurb Weight
DCDirect Current
DEFDefogger

± INTRODUCTIONTERMS
01±11
1AZ±FSE ENGINE REPAIR MANUAL (RM1019E)Abbreviations Meaning
TISTotal Information System For Vehicle Development
T/MTransmission
TMCTOYOTA Motor Corporation
TMMKTOYOTA Motor Manufacturing Kentucky, Inc.
TRCTraction Control System
TURBOTurbocharge
TWCThree±Way Catalyst
U/DUnderdrive
U/SUndersize
VCVVacuum Control Valve
VENTVentilator
VINVehicle Identification Number
VPSVariable Power Steering
VSCVehicle Stability Control
VSVVacuum Switching Valve
VTVVacuum Transmitting Valve
VVT±iVariable Valve Timing±intelligent
w/With
WGNWagon
W/HWire Harness
w/oWithout
WU±TWCWarm Up Three±way Catalytic Converter
WU±OCWarm Up Oxidation Catalytic Converter
1stFirst
2ndSecond
2WDTwo Wheel Drive Vehicle (4 x 2)
3rdThird
4thFourth
4WDFour Wheel Drive Vehicle (4 x 4)
4WSFour Wheel Steering System
5thFifth

± INTRODUCTIONTERMS FOR MANUAL TRANSAXLE REPAIR MANUAL
01±7
C250 M/T REPAIR MANUAL (RM1020E) ISC
Idle 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 Light
MSTManifold Surface temperature±
MVZManifold Vacuum Zone±
NVRAMNon±Volatile Random Access Memory±
O2SOxygen SensorOxygen Sensor, O2 Sensor (O2S)
OBDOn±Board DiagnosticOn±Board Diagnostic (OBD)
OCOxidation Catalytic ConverterOxidation Catalyst Converter (OC), CC0
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 Bypass±
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
TCMTransmission Control ModuleTransmission ECU (Electronic Control Unit)
TPThrottle PositionThrottle Position
TRTransmission Range±
TVVThermal Vacuum ValveBimetallic Vacuum Switching Valve (BVSV)
Thermostatic Vacuum Switching Valve (TVSV)
TWCThree±Way Catalytic ConverterThree±Way Catalytic (TWC)
CC
RO
TWC+OCThree±Way + Oxidation Catalytic ConverterCCR + CCO
VA FVolume Air FlowAir Flow Meter
VRVoltage RegulatorVoltage Regulator
VSSVehicle Speed SensorVehicle Speed Sensor (Read Switch Type)
WOTWide Open ThrottleFull Throttle

01±8
± INTRODUCTIONTERMS FOR MANUAL TRANSAXLE REPAIR MANUAL
C250 M/T REPAIR MANUAL (RM1020E) WU±OC
Warm Up Oxidation Catalytic Converter±
WU±TWCWarm Up Three±Way Catalytic ConverterManifold Converter
3GRThird Gear±
4GRFourth Gear±

A00798
Atmosphere
Housing
Platinum Electrode
Solid Electrolyte
(Zirconia Element)
Platinum Electrode
Heater
Coating (Ceramic)
Exhaust Gas CoverIdeal Air−Fuel Mixture
Output Voltage
Richer−Air Fuel Ratio−Leaner
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
05−83
AVENSIS Supplement (RM1045E)
CIRCUIT DESCRIPTION
To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three−way cata-
lytic converter is used. For the most efficient use of the three−way catalytic converter, the air−fuel ratio must
be precisely controlled so that it is always close to the stoichiometric air−fuel ratio.
The heated oxygen sensor has the characteristic whereby its output voltage changes suddenly in the vicinity
of the stoichiometric air−fuel ratio. This is used to detect the oxygen concentration in the exhaust gas and
to provide the ECM with feedback to control the air−fuel ratio.
When the air−fuel ratio becomes LEAN, the oxygen concentration in the exhaust gas increases. And the
heated oxygen sensor informs the ECM of the LEAN condition (low voltage, i. e. less than 0.45 V).
When the air−fuel ratio is RICHER than the stoichiometric air−fuel ratio, the oxygen concentration in the ex-
haust gas is reduced. And the heated oxygen sensor informs the ECM of the RICH condition (high voltage,
i. e. more than 0.45 V). The ECM judges whether the air−fuel ratio is RICH or LEAN by voltage from the
heated oxygen sensor, and controls the injection timing accordingly. However, if the malfunction of the
heated oxygen sensor causes abnormal voltage output, the ECM becomes unable to perform the accurate
air−fuel ratio control.
The heated oxygen sensors include a heater which heats the zirconia element. The heater is controlled by
the ECM. When the intake air volume is low (the temperature of the exhaust gas is low), the current flows
to the heater in order to heat the sensor for the accurate oxygen concentration detection.

−
DIAGNOSTICS SFI SYSTEM (2AZ−FSE)
05 −37
AVENSIS Supplement (RM 1045E)
DTC No.
(See Page) Memory
*
1
CHK ENG
Trouble Area
Detection Item
P0420 *3
(05 −1 74)
Catalyst System Efficiency Be-
low Threshold (Bank 1)SGas leakage in exhaust system
S Heated oxygen sensor
S Three −way catalytic converter (inside exhaust manifold)
ff
P0430 *3
(05 −1 74)
Catalyst System Efficiency Be-
low Threshold (Bank 2)SGas leakage in exhaust system
S Heated oxygen sensor
S Three −way catalytic converter (inside exhaust manifold)
ff
P0443
(05 −1 79)Evaporative Emission Control
System Purge Control Valve Cir-
cuitSOpen of short in VSV circuit for EVAP
S VSV for EVAP
S ECM
ff
P0500
(05 −1 83)Vehicle Speed Sensor ”A”
SCombination meter
S Open or short in speed sensor circuit
S Vehicle speed sensor
S ECM
S Skid control ECU
S Clutch or brake slips or gear is broken
ff
P0503
(05 −1 83)Vehicle Speed Sensor ”A”
Intermittent/Erratic/high
SCombination meter
S Open or short in vehicle speed sensor circuit
S Vehicle speed sensor
S ECM
S Skid control ECU
S Clutch or brake slips or gear is broken

f
P0504
(05 −1 85)Brake Switch Correlation
SShort in stop lamp switch signal circuit
S Stop lamp switch
S ECM

f
P0505 *3
(05 −1 89)Idle Air Control System
SElectric throttle control system
S Air induction system
S PCV hose connection
ff
P0555
(05 −1 91)Brake Booster Pressure Sensor
Circuit
S Open or short in brake booster pressure sensor circuit
S Brake booster pressure sensor
S Vacuum hose
S ECM
ff
P0556
(05 −1 94)Brake Booster Pressure Sensor
Circuit Range/Performance
SVacuum hose (between the brake booster and intake manifold,
the brake booster and brake booster pressure sensor, and the
intake manifold and manifold absolute pressure sensor)
S Open or short in brake booster pressure sensor circuit
S Brake booster pressure sensor
S Manifold absolute pressure sensor
S Brake booster
S Open or short in stop lamp switch circuit
S Stop lamp switch
S ECM
ff
P0557
(05 −1 91)Brake Booster Pressure Sensor
Circuit Low Input
S Open or short in brake booster pressure sensor circuit
S Brake booster pressure sensor
S Vacuum hose
S ECM
ff
P0558
(05 −1 91)Brake Booster Pressure Sensor
Circuit High Input
S Open or short in brake booster pressure sensor circuit
S Brake booster pressure sensor
S Vacuum hose
S ECM
ff
P0560
(05 −1 99)System VoltageSOpen in back −up power source circuit
S ECMff
P057 1
(*5)Brake Switch ”A” CircuitS Cruise control system
f
P0604
(05 −202)Internal Control Module Random
Access Memory (RAM) ErrorSECMff
P0606
(05 −202)ECM/PCM ProcessorSECMff

A91218
ECM Monitor ed
A/F Sens or Voltage
Air−Fuel Ratio
Solid Electrolyte
(Zirconia Element)
Cover Atmosphere
Exhaust Gas Flange
Platinum Electrode
Coating (Ceramic)
Heater
−
DIAGNOSTICS ECD SYSTEM (1CD−FTV)(From September, 2003)
05 −305
AVENSIS Supplement (RM1045E)
DTC P003 1 OXYGEN (A/F) SENSOR HEATER CONTROL
CIRCUIT LOW (BANK 1 SENSOR 1)
HINT:
S For more information on the A/F sensor and TOYOTA D −CAT (*1), see page 05 −255.
S If P0031 is present, refer to the diagnostic trouble codes (DTCs) table for the TOYOTA D −CAT on page
05 −255.
SThis DTC is related to the A/F sensor, although the caption is the oxygen sensor.
*1: Diesel Clean Advanced Technology.
CIRCUIT DESCRIPTION
The A/F sensor has the characteristic that it provides output voltage which is proportional to the existing air −
fuel ratio. The A/F sensor output voltage (*2) is used to provide the ECM with feedback to control the air −fuel
ratio.
The A/F sensor is located after the DPNR (*3) catalytic converter. This sensor has been developed based
on structure and technology of a sensor that is being used for gasoline engines. Its cover portion of the sen-
sor has been changed for application of use to the diesel engine with TOYOTA D −CAT in order to eliminate
influence of the sensor temperature and particulate matter (PM).
In order to reduce both PM and nitrogen oxides (NOx), the ECM adjusts the air −fuel ratio to slightly RICH
(but it is LEAN compared with a stoichiometric air −fuel ratio) with signals from the A/F sensor, if needed.
When the ECM exercises DPNR catalyst regeneration by adding fuel using the exhaust fuel addition injector,
the air −fuel ratio is also properly adjusted through the sensor.
*2: The voltage value changes inside the ECM only.
*3: Diesel Particulate −NOx Reduction system.
05I7J −01