2005 TOYOTA AVENSIS Service Repair Manual

USB port trunk fuel reserve technical data mirror controls oil pressure

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Page 321 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual B50489Ignition Switch
I13
A18294ECM Connecter
E12E9
E1 (±)MREL (+)
A66054
Engine Room R/B No.1
EFI Fuse
05±128
± DIAGNOSTICSSFI SYSTEM (1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
7 INSPECT

Page 322 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual

A79065
Engine Room R/B No.4
EFI No.1 Fuse
B16200
± DIAGNOSTICSSFI SYSTEM (1ZZ±FE/3ZZ±FE)
05±129
AVENSIS REPAIR MANUAL (RM1018E)
10 CHECK FUSE(EFI No.1 FUSE)
(a) Remove the EFI No.1 fuse

Page 323 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A66053
Engine Room R/B No.4
EFI Relay

A79066
Engine Room R/B No.4
EFI No.1 Fuse
1
2
A65748
MREL
E9
ECM Connector
+B
05±130
± DIAGNOSTICSSFI SYSTEM (1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL

Page 324 of 5135

$TOYOTA AVENSIS 2005 Service Repair Manual \bA79115 Reference (Bank 1 Sensor 2 System Drawing)Heated Oxygen Sensor EFI Relay Heater SensorOX1B HT1BECM From Battery EFI Fuse O1B± MREL EFI No.2 Fuse 05±218 ± DIAGNOSTICS SFI SYSTEM(1AZ±$

Page 325 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual 23
4 1
A79117
+B
HT
Bank 1
Sensor 2
Bank 2
Sensor 2 H8
H10
Heated Oxygen Sensor Connector
E1
OX
B16200
A18294
HT1B (+)HT2B (+)E01 (±)E13
E10
ECM Connector
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±219

Page 326 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual

A79069
Engine Room R/B No.4
EFI No.2 Fuse
05±220
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
4 CHECK FUSE(EFI No.2)
(a) Remove the EFI No.2 fuse from the engine room

Page 327 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A79118
Wire Harness SideBank 1
Sensor 2
Bank 2
Sensor 2 H8
H10
Heated Oxygen Sensor Connector +B
HT
A65744
HT2B
E10
ECM Connector
HT1B

A79070
Engine Room R/B No.4
1 2
EFI No.2 Fuse
A66053

Page 328 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A66651A±A SectionAir Solid Electrolyte
(Zirconia Element)
Platinum ElectrodeHeater
Exhaust Gas
CoverIdeal Air±Fuel Mixture
Output Voltage
Richer ± Air Fuel Ratio ± Leaner Element
AA
± DIAGNOSTICS

A66651A±A SectionAir Solid Electrolyte
(Zirconia Element)
Platinum ElectrodeHeater
Exhaust Gas
CoverIdeal Air±Fuel Mixture
Output Voltage
Richer ± Air Fuel Ratio ± Leaner Element
AA
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
05±211
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0136/27 OXYGEN SENSOR CIRCUIT MALFUNCTION
(BANK 1 SENSOR 2)
DTC P0156/29 OXYGEN SENSOR CIRCUIT MALFUNCTION
(BANK 2 SENSOR 2)
CIRCUIT DESCRIPTION
The heated oxygen sensor is 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 for the CO, HC and NOx components of the exhaust gas, a three±way cata-
lytic converter is used. But 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 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 by the voltage output from the heated oxygen sensor whether the
air±fuel ratio is RICH or LEAN and controls the injection time accordingly. However, 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 NoDTC Detection ConditionTrouble Area
The following condition continues for 480 sec. or more:Open or short in heated oxygen sensor (bank 1, 2 sensor 2)
circuitP0136/27
P0156/29
g
During driving with the engine warmed up, voltage output of
the heated oxygen sensor remains at 0.45 V or more, or 0.60circuit
Heated oxygen sensor (bank 1, 2 sensor 2)
Heated o gen sensor heater (bank 1 2 sensor 2)P0156/29the heated oxygen sensor remains at 0.45 V or more, or 0.60
V or less.Heated oxygen sensor heater (bank 1, 2 sensor 2)
EFI relay
05C6X±01

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