2005 TOYOTA AVENSIS sensor

A91215
VCECM
PEX
E2 W R−W
BR D22
Differential Pressure Sensor
13
218
E13
20
E12
28
E13 VC
GNDVPR−W
W
BR EE1
EE1
EE1 4
9 8
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−459
AVENSIS Supplement (RM1045E) DTC No.
DTC Detection ConditionTrouble Area
P1425
Differential pressure sensor output voltage is less than
0.4 V, or more than 4.8 V for 3 seconds or more
(1trip detection logic)
SOpen or short in differentialpressure sensor circuit
P1427
Differential pressure sensor output voltage is less than
0.4 V for 3 seconds or more
(1trip detection logic)
SOpenorshortindifferentialpressuresensorcircuit
SIncorrect arrangement differential pressure sensor hose pip-
ing
SDifferential pressure sensor
P1428
Differential pressure sensor output voltage is more than
4.8 V for 3 seconds or more
(1trip detection logic)
ee tap essu ese so
SECM
HINT:
SDTC P1426 (Differential pressure sensor [installation]) will be present if there is incorrect vacuum hose
arrangement of the differential pressure sensor.
SAfter confirming DTC P1425, P1427 and P1428, check the differential pressure in the ”DIAGNOSIS
/ OBD/MOBD / DATA LIST / ALL / DPNR DIFF PRESS ” using the hand−held tester.
Reference:
Engine ConditionDifferential Pressure OutputSensor Condition
Ignition Switch ONApproximately 0 kPaNormal
Always3 kPaOpen or short circuit
3,000 rpm (No engine load)Negative outputIncorrect arrangement of hose piping
MONITOR DESCRIPTION
In order to detect abnormality in the differential pressure sensor at any time, the ECM always monitors output
voltage from the sensor. When the sensor output voltage deviates from the normal operating range (between
0.4 V and 4.8 V) for more than 3 seconds, the ECM interprets this as malfunction of the sensor circuit and
illuminates the CHK ENG.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data usingthe hand−held tester.Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air−fuel ratio was lean or rich, and other data
from the time the malfunction occurred.

05−460
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
1 READ VALUE OF HAND −HELD TESTER(DIFFERENTIAL PRESSURE)
(a) Connect the hand −held tester to the DLC3.
(b) Turn the ignition switch to ON and turn the hand −held tester ON.
(c) Select the item ”DIAGNOSIS / OBD/MOBD / DATA LIST / ALL / DPNR DIFF PRESS”.
(d) Check that differential pressure is within the specification below.
Result:
ConditionDifferential PressureProceed to
Always−5 kPa or lessA
Ignition Switch ON−4 kPa to 98 kPaB
Always99 kPaC
B CHECK FOR INTERMITTENT PROBLEMS
(See page 05 −270)
C Go to step 3
A
2 CHECK CONNECTION OF VACUUM HOSE(DIFFERENTIAL PRESSURE SENSOR −
VACUUM TRANSMITTING PIPE)
(a) Check if vacuum hose arrangement between the differential pressure sensor and the vacuum trans-
mitting pipe is not incorrect arrangement (see page 14−1 08).
(b) Check that there is no exhaust gas leak between the differential pressure sensor and the vacuum transmitting pipe (see page 14−1 08).
NG CORRECT TO NORMAL CONNECTION
OK
3 CHECK BLOCKAGE(DIFFERENTIAL PRESSURE SENSOR)
CAUTION:
Be careful for being burned by exhaust gases during the following inspection.
(a) Disconnect the vacuum hose (both up −and downstream) on the differential pressure sensor side.
(b) Start the engine.
(c) Check if there is exhaust gas pulsations from both vacuum hoses during idling.
NG REPLACE CLOGGED PARTS(See page 14−1 08)
OK

A90876
D22
Front View
Wire Harness Side:
Differential pressure
Sensor Connector
VP
VC
GND
A8 1088
E 13
ECM Connector
E
12
PEX
VC
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
05 −46 1
AVENSIS Supplement (RM 1045E)
4 CHECK HARNESS AND CONNECTOR(DIFFERENTIAL PRESSURE SENSOR −
ECM)
(a) Disconnect the D22 differential pressure sensor connec-
tor.
(b) Disconnect the E 12 and E 13 ECM connectors.
(c) Check the resistance between the wire harness side con- nectors.
Standard (Check for open):
Tester ConnectionSpecified Condition
PEX (E 12− 20) − VP (D22 −2)
VC (E 13−1 8)− VC (D22 −3)Below 1

E2 (E 13− 28) − GND (D22 −1 )
Standard (Check for short):
Tester ConnectionSpecified Condition
PEX (E 12− 20) or VP (D22 −2) − Body ground10 k
or higherVC (E 13−1 8) or VC (D22 −3) − Body ground10k
or higher
(d) Reconnect the differential pressure sensor connector.
(e) Reconnect the ECM connectors.
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE DIFFERENTIAL PRESSURE SENSOR ASSY (See page 14−1 08)

A85355
Exhaust Fuel
Addition Injector
Injector Spray Supply PumpExhaust Gas
Temperature
Sensor (on up stream)
ECM Exhaust
Gas
Exhaust Gas Temperature
Sensor (on down stream)
Exhaust Fuel Addition InjectorA/F Sensor DPNR Catalytic
Converter
Turbocharger
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−445
AVENSIS Supplement (RM1045E)
CIRCUIT DESCRIPTION
The exhaust fuel addition injector is mounted on the exhaust port of the cylinder head, and low pressure is
provided to the injector by the feed pump in the supply pump. This injector adds fuel by a control signal from
the ECM.
This injector is used for two different controls: DPNR catalyst regeneration and nitrogen oxides (NOx) reduc-
tion.
Under the DPNR catalyst regeneration control, the injector adds fuel to raise a catalyst temperature.
In the other control, the injector helps the air−fuel ratio become RICH. As a result, NOx in the exhaust gas
will be reduced in response to the RICH air−fuel ratio.

05−446
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
AVENSIS Supplement (RM1045E) DTC No.
DTC Detection ConditionMain Trouble AreaRelated Trouble Area
SExcess or low fuel addition volume from exhaust
fuel addition injector:
When air−fuel ratio deviates from a value estimated
by ECM while the injector adds fuel
(1trip detection logic)SOpen in exhaust temperature
sensor circuit
SA/F sensor
SExhaust gas temperature sensor
SSupply pump assy
SMass air flow meter
SFuelleaksinexhaustfueladdi-
P1386
SLow fuel addition volume from exhaust fuel addition
injector:
When learning value (*3) exceeds standard level
(1trip detection logic)SOpen or short in exhaust fuel
addition injector circuit
SExhaust fuel addition injector
SDPNR catalytic converter (Man-
ifold converter sub−assy)
SFuelleaksinexhaustfueladdi-
tion injector
SMain injector
SCylinder compression pressure
SValve clearance
SValve timing
Airintakesystemhasblockages
SExhaust fuel addition injector nozzle stuck open:
When air−fuel ratio becomes RICHER than standard
level, or exhaust gas temperature reaches higher
than standard level
(1trip detection logic)
SAir intake system has blockages
SAir intake system has leakage
SExhaust system has blockages
SExhaust system has leakage
SEGR system has blockages
SEGR system has leakage
SECM
*3: Correction learning value of the fuel addition volume to raise the DPNR catalyst temperature to a target
range.
HINT:
DTC P2047 (Reductant injector circuit/open [bank1unit1]) will be present if there is an open malfunction in
the exhaust fuel addition injector circuit.

05−450
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
B GO TO DTC P0544, P0545, P0546, P203 1, P2032
AND P2033 (RELATED TO EXHAUST GAS TEM-
PERATURE SENSOR) (See page 05 −415)
A
4 PERFORM ENGINE RPM ACCELERATION(WHITE SMOKE AND FUEL SMELL)
CAUTION:
Stop the engine immediately if you observe that there is white smoke or a fuel smell during the follow-
ing inspection. Fuel may be leaked from the exhaust fuel addition injector.
(a) Remove the battery cable for 1minute, and then reconnect the cable.
(b) After the engine starts, promptly accelerate the engine to approximately 3,000 rpm with no load 3
times.
(c) Check for white smoke in exhaust gases.
(d) Check for a smell in exhaust gases.
Result:
ResultProceed to
Other than aboveA
Either white smoke or fuel smells in exhaust gasesB
B Go to step 17
A
5 READ VALUE OF HAND −HELD TESTER(A/F RATIO)
CAUTION:
Stop the engine immediately if you observe that there is white smoke or a fuel smell during the follow-
ing inspection. Fuel may be leaked from the exhaust fuel addition injector.
(a) Connect the hand −held tester to the DLC3.
(b) Turn the ignition switch to ON and turn the hand −held tester ON.
(c) Start the engine.
(d) Select the item ”DIAGNOSIS / OBD/MOBD / DATA LIST / ALL / AF FT B 1S1”.
(e) Read the air −fuel ratio displayed on the tester after 3 −minute idling.
Result:
A/F RatioProceed to
More than 12A
Less than 12B
B Go to step 17
A

1
2
A8 1503
Component Side:
E16
Exhaust Fuel Addition Injector
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
05 −45 1
AVENSIS Supplement (RM 1045E)
6 READ VALUE OF HAND −HELD TESTER(EXHAUST GAS TEMPERATURE)
CAUTION:
Stop the engine immediately if you observe that there is white smoke or a fuel smell during the follow-
ing inspection. Fuel may be leaked from the exhaust fuel addition injector.
(a) Connect the hand −held tester to the DLC3.
(b) Turn the ignition switch to ON and turn the hand −held tester ON.
(c) Start the engine.
(d) Select the item ”DIAGNOSIS / OBD/MOBD / DATA LIST / ALL / EX TEMP (IN) and EX TEMP (OUT)”.
(e) Check that exhaust gas temperature is within the specification below.
Result:
ConditionExhaust Gas Temperature ( _ C)
Idling after engine warm −upConstant at approximately 50 to 700 ( 122 to 1,292 _ F)
NG GO TO DTC P0544, P0545, P0546, P203 1, P2032
AND P2033 (RELATED TO EXHAUST GAS TEM-
PERATURE SENSOR) (See page 05 −415)
OK
7 READ VALUE OF HAND −HELD TESTER(A/F RATIO)
(a) Connect the hand −held tester to the DLC3.
(b) Turn the ignition switch to ON and turn the hand −held tester ON.
(c) Start the engine.
(d) Select the item ”DIAGNOSIS / OBD/MOBD / DATA LIST / ALL / AF FT B 1 S1”.
(e) After warming up the engine, check if the air −fuel ratio varies when accelerating the engine from idling
to 3,000 rpm by fully depressing the accelerator pedal 3 times.
Result:
Air −fuel RatioProceed to
VariesOK
Not varies onceNG
NG GO TO DTC P2237, P2238 AND P2239
(RELATED TO A/F SENSOR) (See page 05 −484)
OK
8 INSPECT EXHAUST FUEL ADDITION INJECTOR ASSY(RESISTANCE)
(a) Disconnect the E 16 exhaust fuel addition injector connec-
tor.
(b) Measure the resistance between the terminals of the ex-
haust fuel addition injector.
Standard:
Tester ConnectionSpecified Condition
1−211.6 to 12.4
at 20 _C (68 _F)
(c) Reconnect the exhaust fuel addition injector connector.

A81500
P1271Malfunction:
ECMCommand Signal (PRD)
EDU
Confirmation Signal (IJF)
Pressure Discharge Valve
Command Signal
Pressure Discharge Valve
Confirmation SignalPRD
IJFON
OFF
Normal
Abnormal
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−437
AVENSIS Supplement (RM1045E)
MONITOR DESCRIPTION
P1271(Open or short in pressure discharge valve circuit):
This DTC will be set if there is no valve opening confirmation (IJF) signal from the EDU to the ECM, despite
the ECM commanding the pressure discharge valve to open with the EDU. This DTC refers to an open or
short malfunction of the pressure discharge valve circuit, therefore the malfunction that the valve is stuck
open or closed can be excluded.
The EDU monitors the current supplied to the pressure discharge valve and indicates that the current flows
into the valve. If the current exceeds the specified level, the EDU interprets this as the IJF signal is low.
If this DTC is present, the ECM enters the fail−safe mode and limits the engine power. The fail−safe mode
continues until the ignition switch is turned to OFF.
P1272 (Closed malfunction of the pressure discharge valve):
The pressure discharge valve will open and discharge the internal fuel pressure from the common rail to the
fuel tank when the ignition switch is turned to OFF. In this event, the ECM compares the actual dropping rate
of the internal fuel pressure and the simulated dropping rate. If the ECM judges the actual dropping rate is
smaller than the simulation, the ECM then judges that the valve has stuck closed and sets this DTC. This
DTC detection will be activated if the internal fuel pressure does not drop below the specified level after the
ignition switch has been turned to OFF.
If this DTC is present, the ECM enters the fail−safe mode and limits the engine power. The fail−safe mode
continues until the ignition switch is turned to OFF.
MONITOR STRATEGY
P1271:
Required sensorsEDU
Frequency of operationContinuous
Duration3 seconds
CHK ENG operation1 driving cycle