2005 TOYOTA AVENSIS Service Repair Manual

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Page 385 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual 05±248
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P2237/21 OXYGEN SENSOR PUMPING CURRENT
CIRCUIT/OPEN (FOR A/F SENSOR)(BANK 1
SENSOR 1)
DTC P2238/21 OXYGEN SENSOR PUMPIN

Page 386 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual 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)
0

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.

Page 387 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual 05±250
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)DTC No.
DTC Detecting ConditionTrouble Area
A/F sensor circuit (bank 1 sensor 1)HINT : Main trouble area
Open or short in A

05±250
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)DTC No.
DTC Detecting ConditionTrouble Area
A/F sensor circuit (bank 1 sensor 1)HINT : Main trouble area
Open or short in A/F sensor circuit
P2237/21
P2240/28
Conditions (a) and (b) continue for 5.0 sec. or more :
(a) AF+ less than 0.5 V
(b) AF+ greater than 4.5 VOpen or short in A/F sensor circuit
A/F sensor
A/F sensor heater
Conditions (a) and (b) continue for 5.0 sec. or more :
(a) (AF+) ± (AF±) less than 0.1 V
(b) (AF+) ± (AF±) greater than 0.8 V
A/F sensor heater
A/F sensor heater relay
A/F sensor heater and relay circuit
ECM
A/F sensor circuit low (bank 1 sensor 1)HINT : Main trouble area
Open in A/F sensor circuit
P2238/21
P2241/28Condition (a) continues for 5.0 sec. or more :
(a) AF+ less than 0.5 VOpen or short in A/F sensor circuit
A/F sensor
A/F sensor heater
Condition (a) continues for 5.0 sec. or more :
(a) (AF+) ± (AF±) less than 0.1 V
A/F sensor heater
A/F sensor heater relay
A/F sensor heater and relay circuit
ECM
A/F sensor circuit high (bank 1 sensor 1)HINT : Main trouble area
Short in A/F sensor circuit
P2239/21
P2242/28Condition (a) continue for 5.0 sec. or more :
(a) AF+ greater than 4.5 VOpen or short in A/F sensor circuit
A/F sensor
A/F sensor heater
Condition (a) continue for 5.0 sec. or more :
(a) (AF+) ± (AF±) greater than 0.8 V
A/F sensor heater
A/F sensor heater relay
A/F sensor heater and relay circuit
ECM
P2251/21
P2254/28Conditions (a) and (b) continue for 5.0 sec. or more :
(a) AF± less than 0.5 V
(b) AF± greater than 4.5 VOpen or short in A/F sensor circuit
A/F sensor
A/F sensor heaterP2252/21
P2255/28Condition (a) continue for 5.0 sec. or more :
(a) AF± less than 0.5 VA/F sensor heater
A/F sensor heater relay

A/F sensor heater and relay circuitP2253/21
P2256/28Condition (a) continue for 5.0 sec. or more :
(b) AF± greater than 4.5 VA/F sensor heater and relay circuit
ECM
HINT:

means malfunction related
to bank 1 A/F sensor circuit.

means malfunction related
to bank 2 A/F sensor circuit.
Bank 1 refers to the bank that includes cylinder No. 1.
Bank 2 refers to the bank that includes cylinder No. 2.

Page 388 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A76886
IE12
GRECM
MREL 8
E9
44
31
52A/F
Relay
Engine Room
R/B No.4 44
J12BR
D
J/C A/F 2
1
1A 11B±R
W±B Engine
Room
R/B No.1
Engine
Room
J/B No.1
EF ECBR J12 J/CJ13BR
D
EJ13
E B±G
Engine Room

Page 389 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual 05±252
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
HINT:
Hand±held tester only:
Narrowing down the trouble area is possible by performing ACTIVE TEST o

Page 390 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual +25 %
±12.5 %
More than 3.35 V
Less than 3.0 V
Case 1
Case 2
Case 3
Case 4
Output voltage of A/F sensor
(sensor 1)
Injection volume
Output voltage
Output voltage of heated oxygen
sensor (sensor 2)M

Page 391 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A75325
HT
AF+ +B
AF±
Bank 1, Sensor 1 A7
A/F Sensor
A79112
Bank 2, Sensor 1 A8
A/F SensorHT
AF+ +B
AF±
B16200
05±254
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
1 INSPECT A

Page 392 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual

A76787
Wire Harness Side
+B HT
A7Bank 1 Sensor 1
A/F Connector AF+
AF±
A79114
A8Bank 2 Sensor 1 Wire Harness Side
+B
HT
A/F Connector
AF+
AF±
A65745
E12
HA1AHA2AA1A±
A1A+
A2A±
A2A+
B62793
A/

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