2005 TOYOTA AVENSIS Service Repair Manual

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Page 537 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual 05±402
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
18PERFORM CONFIRMATION DRIVING PATTERN (See page 05±363)
HINT:
Clear all DTCs prior to performing the confirmation drivin

Page 538 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A62378
Component Side
+B
HT
E1

B1S1 H7
A61830
+B
HT
E1 Component Side
B2S1 H9
B16200
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
05±403
AVENSIS REPAIR MANUAL (RM1018E)
21 INSPECT HEATED OXYGEN SENS

Page 539 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A76821
Wire Harness Side
B1S1B2S1 H7 H9
Heated Oxygen Sensor Connector OX
HT
OX
HT
E1E1
A76823
OX2A
ECM Connector E12
OX1A
HT2A HT1A
E2 E13
A72920
Reference (Bank 1 Sensor 1 System Drawing)
Heated Oxy

Page 540 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual ±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±405
AVENSIS REPAIR MANUAL (RM1018E)
25PERFORM CONFIRMATION DRIVING PATTERN (See page 05±363)
HINT:
Clear all DTCs prior to performing the confirmation drivin

Page 541 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual ± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
05±363
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0130 OXYGEN SENSOR CIRCUIT (BANK 1
SENSOR 1)
DTC P0150 OXYGEN SENSOR CIRCUIT (BANK 2
SENSOR 1)
DTC P2195 OXYGEN SENSO

Page 542 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual 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

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.

Page 543 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A76864
ECM
MREL
HT1B 8
E9
E1225 H8
Heated Oxygen Sensor (Bank 1 Sensor 2)
4 21
3P
B
W±B 4
2
1
D 2
12
4A
W±B
Battery
EC 1 3
5
J/C
FL MAIN
E B±W
EEBR(*1)
*1: Shielded 4EFI
No. 2Engine
Room
R/B No

Page 544 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual Vehicle speed40 km/h
(25 mph)
Idling(c) (d)
(e)
(a)
IG SW OFF
(b)
(e)
100 sec.
or more (d)
(d)
(f)
20 sec.
or more
20 sec.
or more 20 sec.
or more
20 sec.
or more 20 sec.
or more
30 sec.
A76369
05±36

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