2005 TOYOTA AVENSIS Service Repair Manual

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Page 4377 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual 05−484
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
DTC P2237 OXYGEN (A/F) SENSOR PUMPING
CURRENT CIRCUIT/OPEN (FOR A/F
SENSOR)(BANK1 SENSOR 1)
DTC P2

05−484
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
DTC P2237 OXYGEN (A/F) SENSOR PUMPING
CURRENT CIRCUIT/OPEN (FOR A/F
SENSOR)(BANK1 SENSOR 1)
DTC P2238 OXYGEN (A/F)SENSOR PUMPING CURRENT CIRCUIT LOW (FOR A/F SENSOR)(BANK 1
SENSOR 1)
DTC P2239 OXYGEN (A/F) SENSOR PUMPING CURRENT CIRCUIT HIGH (FOR A/F
SENSOR)(BANK1 SENSOR 1)
HINT:
S For more information on the A/F sensor and TOYOTA D −CAT (* 1) system, see page 05 −255.
S If P2237, P2238 and/or P2239 is present, refer to the diagnostic trouble codes (DTCs) table for TOYO-
TA D −CAT system on page 05 −255.
S These DTCs are recorded when A/F sensor has malfunction, although the caption is the oxygen sen-
sor.
* 1 : Diesel Clean Advanced Technology.
CIRCUIT DESCRIPTION
Refer to DTC P003 1 on page 05 −305.
DTC No.DTC Detecting ConditionTrouble Area
P2237ECM internal error ( 10 seconds)
( 1 trip detection logic)S ECM
P2238
S A/F sensor circuit low (bank 1 sensor 1)
AF+ is less than 04 V for 50 seconds or more
Main trouble area: Open in A/F sensor circuit
S Open or short in A/F sensor circuit
S A/F sensor
S A/F sensor heaterP2238AF+ is less than 0.4 V for 5.0 seconds or more
( 1 trip detection logic)S A/F sensor heater
S A/F sensor heater relay
S A/F sensor heater and relay circuit
S ECM
P2239
S A/F sensor circuit high (bank 1 sensor 1)
AF+ is more than 44 V for 50 seconds or more
Main trouble area: Short in A/F sensor circuit
S Open or short in A/F sensor circuit
S A/F sensor
S A/F sensor heaterP2239AF+ is more than 4.4 V for 5.0 seconds or more
( 1 trip detection logic)S A/F sensor heater
S A/F sensor heater relay
S A/F sensor heater and relay circuit
S ECM
MONITOR DESCRIPTION
The A/F sensor has a characteristic that it varies its voltage output in proportion to the air −fuel ratio. If imped-
ance (alternating current resistance) or voltage output of the sensor extraordinarily deviates from the stan-
dard range, the ECM interprets this as an open or short malfunction of the A/F sensor circuit.
WIRING DIAGRAM
Refer to DTC P003 1 on page 05 −305.
05I7U −01

Page 4378 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A87894
AF− AF+
A34
Front View
Component Side
(w/ Headlight Beam Level Control):
1
2
3
4
HT
+B
A/F Sensor
Connector
A87894
AF−
AF+
A34
Front View
HT +B
1
2
3
4
Component Side
(w/o Headlight Beam L

Page 4379 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual B16200
05−486
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
AVENSIS Supplement (RM1045E)
3 INSPECT AIR FUEL RATIO SENSOR HEATER RELAY
(a) Remove the A/F sensor heater relay.
(b) Check

Page 4380 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A90355
+B HTA34
Front View A/F Sensor ConnectorAF+ AF− Wire Harness Side
(w/ Headlight Beam Level Control):
A90355
Wire Harness Side
(w/o Headlight Beam Level Control):
A34
Front View A/F Sensor Con

Page 4381 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual 05−488
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE ECM (See page 10− 29)

Page 4382 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual 05−482
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
DTC P2226 BAROMETRIC PRESSURE CIRCUIT
DTC P2228 BAROMETRIC PRESSURE CIRCUIT LOW
INPUT
DTC P2229 BA

Page 4383 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual −
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
05 −479
AVENSIS Supplement (RM 1045E)
DTC P2 121 THROTTLE/PEDAL POSITION SENSOR/
SWITCH ”D” CIRCUIT RANGE/
PERFORMANCE
CIRCUIT DES

Page 4384 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A84814
VCP2 EP2
EP1
VCP 1
A20
Component Side (RHD):
1
2
5
64 3
Accelerator Pedal Position Sensor
A848 14
VCP 1
EP
1
EP2
VCP2
A20
1
2
5
64
3
Accelerator Pedal Position Sensor
Component Side (LHD):
A6

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