catalytic converter TOYOTA AVENSIS 2005 Service User Guide

A73819A±A SectionAirSolid Electrolyte
(Zirconia Element)
Platinum
Electrode Heater
Exhaust Gas
Cover Element
A
A
ECM Monitored
A/F Sensor Voltage
Air±Fuel Ratio
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
05±249
AVENSIS REPAIR MANUAL (RM1018E)
DTC P2255/28 OXYGEN SENSOR REFERENCE GROUND
CIRCUIT LOW (FOR A/F SENSOR)(BANK 2
SENSOR 1)
DTC P2256/28 OXYGEN SENSOR REFERENCE GROUND
CIRCUIT HIGH (FOR A/F SENSOR)(BANK 2
SENSOR 1)
CIRCUIT DESCRIPTION
HINT:
This DTC is recorded when A/F sensor has a malfunction, although the caption is healed oxygen sensor.
The air±fuel ratio sensor are the lamination type. Compared to the conventional type, the sensor and heater
portions of the lamination type are narrower overall. Because the heat of the heater acts directly on the alumi-
na and zirconia (of the sensor portion) it accelerates the activation of the sensor.
To obtain a high purification rate of 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 A/F sensor has the characteristic that it provides output voltage* being approximately proportional to
the existing air±fuel ratio. The A/F sensor output voltage* is used to provide feedback for the ECM to control
the air±fuel ratio.
By the A/F sensor output, the ECM can determine the deviation amount from the stoichiometric air±fuel ratio
and control the proper injection time immediately. If the A/F sensor is out of order, ECM is unable to perform
the accurate air±fuel ratio control.
The A/F sensor is equipped with 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 to heat the sensor for the accurate oxygen concentration detection.
*: The voltage value changes at the inside of the ECM only.

±
DIAGNOSTICS SFI SYSTEM (1AZ±FSE)
05±313
AVENSIS REPAIR MANUAL (RM1018E)


\f  
*
1
CHK ENG
 
 \b
P0300 *3
(05±420)
Random/Multiple Cylinder Misfire
Detected
Open or short in engine wire

Connector connection


Vacuum hose connection
*2
P0301 *3
(05±420)Cylinder 1 Misfire Detected

Vacuum hose connection

Ignition system

Injector

Fuelpressure
*2
P0302 *3
(05±420)Cylinder 2 Misfire Detected

Fuel pressure

Mass air flow meter

Engine coolant temperature sensor

Compressionpressure
*2
P0303 *3
(05±420)Cylinder 3 Misfire Detected

Compression pressure

Valve clearance

Valve timing
PCV h ti
*2
P0304 *3
(05±420)Cylinder 4 Misfire Detected

PCV hose connection

PCV hose

ECM
*2
P0325
(05±429)Knock Sensor 1 Circuit (Bank 1
or Single Sensor)
Knock sensor

Knock sensor (under±torqued or loose)

ECM

P0327
(05±429)Knock Sensor 1 Circuit Low In-
put (Bank 1 or Single Sensor)
Short in knock sensor circuit

Knock sensor

ECM

P0328
(05±429)Knock Sensor 1 Circuit High In-
put (Bank 1 or Single Sensor)
Open in knock sensor circuit

Knock sensor

ECM

P0335
(05±433)Crankshaft Position Sensor ºAº
Circuit
Open or short in crankshaft position sensor circuit

Crankshaft position sensor
P0339
(05±433)Crankshaft Position Sensor ºAº
Circuit Intermittent
Crankshaft osition sensor

Signal plate (crankshaft position sensor plate No. 1)

ECM

P0340
(05±436)Camshaft Position Sensor ºAº
Circuit (Bank 1 or Single Sensor)
Open or short in camshaft position sensor circuit

Camshaft position sensor
P0341
(05±436)Camshaft Position Sensor ºAº
Circuit Range/Performance
(Bank 1 or Single Sensor)
Camshaft osition sensor

Camshaft timing gear

Timing chain has jumped a tooth

ECM

P0351
(05±439)Ignition Coil ºAº Primary/Sec-
ondary Circuit

Ignition system

P0352
(05±439)Ignition Coil ºBº Primary/Sec-
ondary Circuit
Ignition system

Open or short in IGF and IGT circuit from ignition coil with
igniter to ECM (ignition coil circuit 1 through 4)
P0353
(05±439)Ignition Coil ºCº Primary/Sec-
ondary Circuit
igniter to ECM (ignition coil circuit 1 through 4)

Ignition coil with igniter (ignition coil 1 through 4)

IG2 relay
P0354
(05±439)Ignition Coil ºDº Primary/Sec-
ondary Circuit
ECM
P0420 *3
(05±446)
Catalyst System Efficiency Be-
low Threshold (Bank 1)
Gas leakage in exhaust system

Heated oxygen sensor

P0430 *3
(05±446)
Catalyst System Efficiency Be-
low Threshold (Bank 2)
Heated oxygen sensor

Three±way catalytic converter (inside exhaust manifold)

P0443
(05±449)Evaporative Emission Control
System Purge Control Valve Cir-
cuit
Open of short in VSV circuit for EVAP

VSV for EVAP

ECM

P0500
(05±453)Vehicle Speed Sensor ºAº

Combination meter

Open or short in speed sensor circuit

Vehicle speed sensor

ECM

Skid control ECU

Clutch or brake slips or gear is broken

P0504
(05±455)Brake Switch Correlation

Short in stop light switch signal circuit

Stop light switch

ECM



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
05±364
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
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
provide the ECM with feedback 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 will be vanished from
the exhaust gas. And the heated oxygen sensor informs the ECM of the RICH condition (high voltage, i.e.
more than 0.45 V). The ECM judges by the voltage output from the heated oxygen sensor whether the air±
fuel ratio is RICH or LEAN and controls the injection time accordingly. If the malfunction of the heated oxygen
sensor causes an output of abnormal voltage, the ECM becomes unable to perform 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), current flows to the
heater in order to heat the sensor for the accurate oxygen concentration detection.
DTC No.DTC Detection ConditionTrouble Area
P0130
P0150Output voltage of heated oxygen sensor (sensor 1) remains at
0.4 V or more, or 0.55 V or less, during idling after engine is
warmed up (2 trip detection logic)
Open or short in heated oxygen sensor (bank 1, 2 sensor 1)
circuit

Heated oxygen sensor (bank 1, 2 sensor 1)
P2195
P2197Output voltage of heated oxygen sensor (sensor 1) remains at
0.55 V or less, during idling after engine is warmed up (2 trip
detection logic)
Heated oxygen sensor (bank 1, 2 sensor 1)

Heated oxygen sensor heater (bank 1, 2 sensor 1)

EFI relay

Air induction system
P2196
P2198Output voltage of heated oxygen sensor (sensor 1) remains at
0.4 V or more, during idling after engine is warmed up (2 trip
detection logic)
y

Fuel pressure

Injector

ECM
HINT:

Bank 1 refers to the No. 1 and No. 4 cylinders.

Bank 2 refers to the No. 2 and No. 3 cylinders.

Sensor 1 refers to the sensor closest to the engine assembly.

The output voltage of the heated oxygen sensor and the short±term fuel trim value can be read using
the hand±held tester.

A54278
Waveform of Heated Oxygen
Sensor before CatalystNormal CatalystWaveform of Heated
Oxygen Sensor
after Catalyst
05±446
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW
THRESHOLD (BANK 1)
DTC P0430 CATALYST SYSTEM EFFICIENCY BELOW
THRESHOLD (BANK 2)
CIRCUIT DESCRIPTION
The ECM compares the waveform of the heated oxygen sensor located before the catalyst with the wave-
form of the heated oxygen sensor located after the catalyst to determine whether or not the catalyst perfor-
mance has deteriorated.
The air±fuel ratio feedback compensation keeps the waveform of the heated oxygen sensor before the cata-
lyst repeatedly changing back and forth from rich to lean.
If the catalyst is functioning normally, the waveform of the heated oxygen sensor after the catalyst switches
back and forth between rich and lean much more slowly than the waveform of the heated oxygen sensor
before the catalyst.
But when both waveforms change at a similar rate, it indicates that the catalyst performance has deterio-
rated.

DTC No.DTC Detection ConditionTrouble Area
P0420
P0430
After engine and catalyst are warmed up, and while vehicle is
driven within set value and engine speed range, waveforms of
heated oxygen sensors have the same amplitude
(2 trip detection logic)
Gas leakage in exhaust system

Heated oxygen sensor

Three±way catalytic converter (inside exhaust manifold)
HINT:

Bank 1 refers to the No. 1 and No. 4 cylinders.

Bank 2 refers to the No. 2 and No. 3 cylinders.

Sensor 1 refers to the sensor closest to the engine assembly.

Sensor 2 refers to the sensor farthest away from the engine assembly.
05CKM±01

05±448
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
1CHECK OTHER DTC OUTPUT(IN ADDITION TO P0420 AND/OR P0430)
(a)Read the DTC using the hand±held tester. Result:
Display (DTC output)Proceed to
Only ºP0420 and/or P0430º are outputA
ºP0420 or P0430º and other DTCs are outputB
HINT:
If any other codes besides ºP0420 and/or P0430º are output, perform \
the troubleshooting for those DTCs
first.
BGO TO RELEVANT DTC CHART (See page 05±309)
A
2CHECK FOR EXHAUST GAS LEAKS
NGREPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT
OK
3CHECK HEATED OXYGEN SENSOR(BANK 1, 2 SENSOR 1) (See page 05±363)
NG REPLACE HEATED OXYGEN SENSOR
OK
4CHECK HEATED OXYGEN SENSOR(BANK 1, 2 SENSOR 2) (See page 05±388)
NG REPLACE HEATED OXYGEN SENSOR
OK
REPLACE THREE±WAY CATALYTIC CONVERTER (EXHAUST MANIFOLD)

± INTRODUCTIONTERMS
01±13
1AZ±FSE ENGINE REPAIR MANUAL (RM1019E) 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±Volatile 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

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