2005 TOYOTA AVENSIS diagnostic

A76878
A20
Accelerator Pedal
Position Sensor
VCP16 (LHD)
E926ECM
VCPA B
4 (RHD)
(LHD)B
(LHD) 5
IG2
B
(RHD)
VPA15 (LHD)
E922
VPA G
5 (RHD)
(LHD)G
(LHD) 6
IG2
G
(RHD)
EP13 (LHD)
E928
EPA Y
1(RHD)
(LHD)Y
(LHD) 1
IG2
Y
(RHD)
VCP24 (LHD)
E927
VCP2 B
6 (RHD)
(LHD)B
(LHD) 7
IG2
B
(RHD)
VPA22 (LHD)
E923
VPA2 W
2 (RHD)
(LHD)W
(LHD) 2
IG2
W
(RHD)
EP21(LHD)
E929
EPA2 Y
3 (RHD)
(LHD)Y
(LHD) 3
IG2
Y
(RHD)
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−475
AVENSIS Supplement (RM1045E)
HINT:
After confirming DTC P2120, P2122, P2123, P2125, P2127, P2128 and P2138, check the accelerator pedal
position sensor output voltage using the hand−held tester.
Reference:
Accelerator Pedal Position (Voltage Output)
Trouble AreaAccelerator Pedal ReleasedAccelerator Pedal DepressedTroubleArea
ACCEL POS #1ACCEL POS #2ACCEL POS #1ACCEL POS #2
Normal condition0.5 to1.1V1.2 to 2.0 V2.6 to 4.5 V3.4 to 5.3 V
VCP circuit open0 to 0.2 V0 to 0.2 V0 to 0.2 V0 to 0.2 V
VPA circuit open or ground short0 to 0.2 V1.2 to 2.0 V0 to 0.2 V3.4 to 5.3 V
VPA2 circuit open or ground short0.5 to1.1V0 to 0.2 V2.6 to 4.5 V0 to 0.2 V
EP circuit open4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V
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.

FI7052Depressed Released
A848
14
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):
05
−476
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
1 READ VALUE OF HAND −HELD TESTER(ACCEL POS # 1 AND ACCEL POS #2)
(a) Connect the hand −held tester to the DLC3.
(b) Turn the ignition switch to ON.
(c) Select the item ”DIAGNOSIS / OBD/MOBD / DATA LIST / ETCS / ACCEL POS # 1 and ACCEL POS #2” and read
its value displayed on the hand −held tester.
Standard:
Accelerator PedalACCEL POS # 1ACCEL POS #2
Released0.5 to1.1 V1.2 to 2.0 V
Depressed2.6 to 4.5 V3.4 to 5.3 V
OK REPLACE ECM (See page 10− 29)
NG
2 INSPECT ACCELERATOR PEDAL ASSY(ACCELERATOR PEDAL POSITION SENSOR)
(a) Disconnect the A20 accelerator pedal position sensor
connector.
(b) Measure the resistance between each terminal. Standard (RHD):
Tester ConnectionSpecified Condition
EP1(1 ) − VCP 1(4)225t475k
t20_C(68_F)EP2 (3) −VCP2 (6)2.25 to 4.75 k
at 20 _C (68 _F)
Standard (LHD):
Tester ConnectionSpecified Condition
EP 1(3) −VCP 1(6)225t475k
t20_C(68_F)EP2 ( 1) − VCP2 (4)2.25 to 4.75 k
at 20 _C (68 _F)
(c) Reconnect the accelerator pedal position sensor connec-
tor.
NG REPLACE ACCELERATOR PEDAL ASSY (See page 10− 66 of Pub. No. RM 10 18E AVENSIS
REPAIR MANUAL)
OK

A66060ECM ConnectorEPA (
−) VCPA (+)
E9
EPA2 ( −)
VCP2 (+)
A66060ECM Connector EPA (
−) E9
EPA2 (
−)
VCP2 (+)VCPA (+)
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
05 −477
AVENSIS Supplement (RM 1045E)
3 INSPECT ECM(VCPA AND VCP2 VOLTAGE)
(a) Turn the ignition switch to ON.
(b) Measure the voltage between the specified terminals of
the E9 ECM connector.
Standard:
Tester ConnectionSpecified Condition
VCPA (E9 −26) − EPA (E9 −28)45 t 55 VVCP2 (E9 −27) − EPA2 (E9 −29)4.5 to 5.5 V
NG REPLACE ECM (See page 10− 29)
OK
4 INSPECT ECM(VPA AND VPA2 VOLTAGE)
(a) Turn the ignition switch to ON.
(b) Measure the voltage between the specified terminals of the E9 ECM connector.
Standard:
Accelerator Pedal PositionTester ConnectionSpecified Condition
ReleasedVPA (E9−22)0.5 to 1.1 V
Depressed
VPA (E9 22)
− EPA (E9 −28)2.6 to 4.5 V
ReleasedVPA2 (E9 −23)1.2 to 2.0 V
Depressed
VPA2 (E9 23)
− EPA2 (E9 −29)3.4 to 5.3 V
OK REPLACE ECM (See page 10− 29)
NG

A84847
EP1 EP2VPA2
VCP 1
VPA1VCP2
A20
Wire Harness Side (RHD):
Front View
Accelerator Pedal Position Sensor
Connector
A84847
EP
1
EP2VPA2
VCP1
VPA 1
VCP2
A20
Accelerator Pedal Position Sensor
Connector
Wire Harness Side (LHD):
Front View
A8109 1
E9
ECM Connector VPA
VCPA
VPA2
EPA2 VCP2EPA
05−478
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
5 CHECK HARNESS AND CONNECTOR(ACCELERATOR PEDAL POSITION
SENSOR − ECM)
(a) Disconnect the A20 accelerator pedal position sensor
connector.
(b) Disconnect the E9 ECM connector.
(c) Check the resistance between the wire harness side con- nectors.
Standard (Check for open) (RHD):
Tester ConnectionSpecified Condition
VPA1 (A20 −5) − VPA (E9 −22)
EP 1 (A20 −1 )− EPA (E9 −28)
VCP 1 (A20 −4) − VCPA (E9 −26)Below1
VPA2 (A20 −2) − VPA2 (E9 −23)Below 1

EP2 (A20 −3) − EPA2 (E9 −29)
VCP2 (A20 −6) − VCP2 (E9 −27)
Standard (Check for open) (LHD):
Tester ConnectionSpecified Condition
VPA 1 (A20 −5) − VPA (E9 −22)
EP 1 (A20 −3) − EPA (E9 −28)
VCP 1 (A20 −6) − VCPA (E9 −26)Below1
VPA2 (A20 −2) − VPA2 (E9 −23)Below 1

EP2 (A20 −1 )− EPA2 (E9 −29)
VCP2 (A20 −4) − VCP2 (E9 −27)
Standard (Check for short) (RHD):
Tester ConnectionSpecified Condition
VPA 1 (A20 −5) or VPA (E9 −22) − Body ground
EP 1 (A20 −1 ) or EPA (E9 −28) − Body ground
VCP 1 (A20 −4) or VCPA (E9 −26) − Body ground10 k
or higherVPA2 (A20 −2) or VPA2 (E9 −23) − Body ground10k
or higher
EP2 (A20 −3) or EPA2 (E9 −29) − Body ground
VCP2 (A20 −6) or VCP2 (E9 −27) − Body ground
Standard (Check for short) (LHD):
Tester ConnectionSpecified Condition
VPA 1 (A20 −5) or VPA (E9 −22) − Body ground
EP 1 (A20 −3) or EPA (E9 −28) − Body ground
VCP 1 (A20 −6) or VCPA (E9 −26) − Body ground10 k
or higherVPA2 (A20 −2) or VPA2 (E9 −23) − Body ground10k
or higher
EP2 (A20 −1 ) or EPA2 (E9 −29) − Body ground
VCP2 (A20 −4) or VCP2 (E9 −27) − Body ground
(d) Reconnect the accelerator pedal position sensor connec-
tor.
(e) Reconnect the ECM connector.
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM (See page 10− 29)

A85357
DPNR (Diesel Particulate−NOx Reduction System) Catalyst Monolithic Construction:
NO, PM
HC, CO N2, CO2
H
2O
Exhaust Gas Temperature
Sensor (on up stream) ECM
Exhaust Gas Temperature
Sensor (on down stream)
Wall −Flow Type:
Differential Pressure Sensor
Cross Section
Magnified ViewGas Flow
PM
Exhaust Gas
DPNR (Diesel Particulate −NOx Reduction System):
DPNR Catalytic
Converter
05
−466
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
DTC P2002 PARTICULATE TRAP EFFICIENCY BELOW
THRESHOLD (BANK 1)
HINT:
S For more information on the DPNR (* 1) catalytic converter and TOYOTA D −CAT (*2), see page
05 −255.
S If P2002 is present, refer to the diagnostic trouble codes (DTCs) table for TOYOTA D −CAT on page
05 −255.
* 1 : Diesel Particulate −NOx Reduction system.
*2: Diesel Clean Advanced Technology.
CIRCUIT DESCRIPTION
DPNR catalyst has ability to reduce nitrogen oxides (NOx) and particulate matter (PM) in addition to purifica-
tion of hydrocarbons (HC) and carbon monoxides (CO). DPNR material is monolithic construction. Its inlets
and outlets block up with each other, and its surface is coated with NOx absorptive deduction −type catalyst.
Because exhaust gases flow through micro −cavities inside walls, it is called ”wall −flow” type.
05I83 −01

A91205
Malfunction Detection:
DPNR Catalyst Regeneration
(Activation of Fuel Addition)
Approximately 300_C (572_F) OFFON
NormalMore than
Approximately 600_C(1,112_F)
Abnormal
Time Exhaust Gas Temperature
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−467
AVENSIS Supplement (RM1045E) DTC No.
DTC Detection ConditionTrouble Area
P2002
Condition (a) or (b) is met (1trip detection logic):
(a) Differential pressure exceeds a standard level for more than
10 seconds
(b) Exhaust gas temperature does not raise during DPNR cata-
lyst regeneration
SDPNR catalytic converter (Manifold converter sub−assy)
SDifferential pressure sensor
SDifferential pressure sensor vacuum hose is clogged
SBlockage in Vacuum transmitting pipe sub−assy
SExhaust gas temperature sensor
SExhaust gas leaks in TOYOTA D−CAT
SMass air flow meter
SECM
MONITOR DESCRIPTION
In order to detect abnormality in the DPNR (*3) catalytic converter, the ECM monitors an exhaust gas temper-
ature as well as a differential pressure of the exhaust gas. For monitoring the differential pressure, the ECM
compares the up−and downstream pressure of the DPNR catalytic converter. If the difference between the
pressure is large, the ECM judges that the DPNR has contaminated or deteriorated, and then illuminates
the CHK ENG.
Furthermore, the ECM monitors increase in the exhaust gas temperature while the exhaust fuel addition in-
jector adds fuel under DPNR catalyst regeneration. The exhaust gas temperature during the DPNR catalyst
regeneration normally rises from approximately 300_C (572_F) to approximately 600_C(1,112_F) or higher.
If the temperature does not rise even if a certain period of time has elapsed, the ECM interprets this as mal-
function of the DPNR and illuminates the CHK ENG.
*3: Diesel Particulate−NOx Reduction system.
INSPECTION PROCEDURE
HINT:
SRead 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.
SIf (exhaust gas) differential pressure (DPNR DIFF PRESS) of the DPNR catalytic converter does not
virtually develop when increasing the engine speed, the DPNR catalytic converter may be malfunction-
ing.

05−468
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
1 CHECK OTHER DTC OUTPUT(IN ADDITION TO P2002)
(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 / DTC INFO / CURRENT CODES”.
(d) Read DTCs.
Result:
Display (DTC output)Proceed to
P2002A
P2002 and other DTCsB
HINT:
If any other codes besides P2002 are output, perform troubleshooting for those DTCs first.
B GO TO RELEVANT DTC CHART(See page 05 −299)
A
2 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) Start the engine.
(d) Select the item ”DIAGNOSIS / OBD/MOBD / DATA LIST / ALL / DPNR DIFF PRESS”.
(e) Select the item ”DIAGNOSIS / OBD/MOBD / DATA LIST / ALL / MAF”.
(f) Check that differential pressure. Result:
Engine Speed (Vehicle is stop)Differential Pressure (kPa)Proceed to
3,000 rpm (No engine load)Less than MAF rate (mass air flow rate)
0.4A
3,000 rpm (No engine load)More than MAF rate (mass air flow rate)
0.4B
HINT:
SIf the differential pressure is more than a value that the intake air amount (MAF: g/sec) is multiplied
by 0.4, DTC P2002 (Particulate Trap Efficiency Below Threshold [Bank 1]) will be present.
SThe standards for the differential pressure sensor are as follows.
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
B Go to step 4
A

−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
05 −469
AVENSIS Supplement (RM 1045E)
3 READ VALUE OF HAND −HELD TESTER(EXHAUST GAS TEMPERETURE)
(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. Reference:
ConditionExhaust Gas Temperature ( _ C)
Idling after engine warm −upConstant at approximately 50 to 700 ( 122 to 1,292 _ F) *3
*3: There should be no noise.
NG REPAIR OR REPLACE EXHAUST GASTEMPERATURE SENSOR, HARNESS OR
CONNECTOR
OK
4 CHECK BLOCKAGE(DIFFRENTIAL 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
5 CHECK FOR EXHAUST GAS LEAKS
(a) Check that there is no exhaust gas leak in the exhaust system components and differential pressure sensor vacuum hoses.
NG REPAIR OR REPLACE LEAKAGE POINT
OK
REPLACE MANIFOLD CONVERTER SUB −ASSY (See page 14−1 08)