2005 TOYOTA AVENSIS diagnostic

A91213
MREL B−W
GR8
3 EFI MAIN Relay
W−BE9 E12
2 EE1
EFIB−R
(LHD) 1
B5
Battery FL MAINI17
Intake Shutter (Throttle Valve)
LUSL 4
1
1
1 1A 1 1
121
2
B−W 10Engine Room R/B No.1ECM
1
Engine Room
R/B No. 3 3
3 B
EC B−Y
(RHD) IE1 2G−R
3
EI GR W−B DUTY
GND +B
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−405
AVENSIS Supplement (RM1045E)
WIRING DIAGRAM
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.
SAfter engine warm−up, DTC P0488 malfunction is set1second or more passed after quickly accelerat-
ing the engine from idling.

05−406
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
1 CHECK OTHER DTC OUTPUT(IN ADDITION TO P0488)
(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
P0488A
P0488 and P0 120, P0 122 and/or P0 123B
HINT:
If any other codes besides P0488 are output, perform troubleshooting for those DTCs first.
B GO TO RELEVANT DTC CHART(See page 05 −299)
A
2 READ OUTPUT DTC(DTC P0488 OUTPUT)
(a) Connect the hand −held tester to the DLC3.
(b) Turn the ignition switch to ON and push the hand −held tester ON.
(c) Select the item ”DIAGNOSIS / OBD/MOBD / DTC INFO / CLEAR CODES”.
(d) Clear the DTCs.
(e) Start the engine and perform quick engine RPM acceleration from idling to 3,000 rpm 3 times.
(f) Select the item ”DIAGNOSIS / OBD/MOBD / DTC INFO / CURRENT CODES”.
(g) Read DTCs.
Result:
Display (DTC output)Proceed to
P0488A
No outputB
HINT:
The normal operation of the intake shutter (throttle valve) is as follows.Reference:
ConditionThrottle Position
Quickly accelerate the engine from idling to 3,000 rpmOpening angle varies smoothly
B CHECK FOR INTERMITTENT PROBLEMS (See page 05 −270)
A

A81086ECM Connector E
12
LUSL
E
1
A9 1225
Signal Waveform
1 V/
Division
2 msec./Division
LUSL
A9
1227
I1 7
Wire Harness Side:
Intake shutter Connector
Front VIew 1
2
3
DUTY
A8 1087
E 12
ECM Connector LUSL
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
05 −407
AVENSIS Supplement (RM 1045E)
3 INSPECT ECM(LUSL VOLTAGE)
(a) Inspect using the oscilloscope.
(b) During rev −up, check the waveform between the speci-
fied terminals of the E 12 ECM connector.
Standard:
Tester ConnectionSpecified Condition
LUSL (E 12− 4) − E1 (E 19− 7)Correct waveform is as shown
NG REPLACE ECM (See page 10− 29)
OK
4 CHECK HARNESS AND CONNECTOR(INTAKE SHUTTER (THROTTLE VALVE) −
ECM)
(a) Disconnect the I 17 intake shutter connector.
(b) Disconnect the E 12 ECM connector.
(c) Check the resistance between the wire harness side con-
nectors.
Standard (Check for open):
Tester ConnectionSpecified Condition
LUSL (E 12− 4) − DUTY (I 17−1 )Below 1

Standard (Check for short):
Tester ConnectionSpecified Condition
LUSL (E 12− 4) or DUTY (I 17−1 )− Body ground10k
or higher
(d) Reconnect the intake shutter connector.
(e) Reconnect the ECM connector.
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE INTAKE SHUTTER ASSY (THROTTLE VALVE) (See page 10− 27)

A91223
Output Voltage (V)0.1
0 4.0
2.1Detect P0406
Detect P0405 4.95.0
EGR Valve Opening Angle (%)0
100 Property of Output Voltage:
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−399
AVENSIS Supplement (RM1045E)
DTC P0405 EXHAUST GAS RECIRCULATION SENSOR
”A” CIRCUIT LOW
DTC P0406 EXHAUST GAS RECIRCULATION SENSOR
”A” CIRCUIT HIGH
CIRCUIT DESCRIPTION
The EGR valve position sensor is mounted on the EGR valve and used for detecting the lift amount of the
valve. The lift amount detected by the sensor is provided to the ECM as feedback, the ECM then regulates
the lift amount of the valve in accordance with engine running condition.
DTC No.DTC Detection ConditionTrouble Area
P0405
EGR valve position sensor output voltage is less than 0.1 V for
more than 0.5 second
(1 trip detection logic)
SOpen or short in EGR valve position sensor circuit
SEGRvalvepositionsensor
P0406EGR valve position sensor output voltage is more than 4.9 V for
more than 0.5 second
(1 trip detection logic)SEGRvalve position sensor
SECM
HINT:
After confirming DTC P0405 and P0406, check the EGR valve opening angle condition in the ”DIAGNOSIS
/ OBD/MOBD / DATA LIST / ALL / EGR VALVE POS” using the hand−held tester.
ResultConditionIgnition switch ON (Engine is stop)Idling after warmed upCondition
Changes between 2.1 V and 4.0 VNormal
Less than 0.1 VP0405 (Low input voltage)
More than 4.9 VP0406 (High input voltage)
MONITOR DESCRIPTION
When output voltage of the EGR valve position sensor deviates
from the normal operating range (between 0.1 V and 4.9 V) for
more than 0.5 second, the ECM interprets this as malfunction
of the sensor circuit, and illuminates the CHK ENG.
05I7O−01

A12544
VCECM
EGLS
E2
R
R
−W
BR
E18
EGR Valve Position Sensor
1
3
2 18
E13
33
E12
28
E13
VC
E2
EGLS 5V
E1
A85350
E18
Front View
Wire Harness Side:
EGR valve position Sensor Connector
12 3
VC E2 EGLS
05 −400
−
DIAGNOSTICS ECD SYSTEM (1CD−FTV)(From September, 2003)
AVENSIS Supplement (RM1045E)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the 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.
1 CHECK HARNESS AND CONNECTOR(EGR VALVE POSITION SENSOR VOLTAGE)
(a) Disconnect the E18 EGR valve position sensor connec-
tor.
(b) Measure the voltage between the specified terminals of
the E18 EGR valve position sensor connector.
Standard:
Tester ConnectionSpecified Condition
VC (E18 −1) − E2 (E18 −2)4.5 to 5.5 V
(c) Reconnect the EGR valve position sensor connector.
NG Go to step 4
OK
2 INSPECT EGR VALVE POSITION SENSOR(RESISTANCE) (See page 12− 9)
NG REPLACE EGR VALVE POSITION SENSOR
(See page 14−1 08)
OK

A85350
E18
Front View
Wire Harness Side:
EGR valve position Sensor Connector
12 3
VC E2 EGLS
A81087
E12
ECM Connector
EGLS
A85350
E18
Front View
Wire Harness Side:
EGR valve position Sensor Connector
12 3
VC E2 EGLS
A81087
E12
ECM Connector
EGLS
−
DIAGNOSTICS ECD SYSTEM (1CD−FTV)(From September, 2003)
05 −40 1
AVENSIS Supplement (RM1045E)
3 CHECK HARNESS AND CONNECTOR(EGR VALVE POSITION SENSOR − ECM)
(a) Disconnect the E18 EGR valve position sensor connec-
tor.
(b) Disconnect the E12 ECM connector.
(c) Check the resistance between the wire harness side con-
nectors.
Standard (Check for open):
Tester ConnectionSpecified Condition
EGLS (E18 −3) − EGLS (E12 −33)Below 1
E2 (E18 −2) − E2 (E13 −28)Below 1

Standard (Check for short):
Tester ConnectionSpecified Condition
EGLS (E18 −3) or EGLS (E12 −33) − Body ground10 k
or higher
(d) Reconnect the EGR valve position sensor connector.
(e) Reconnect the ECM connector.
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM (See page 10− 29)
4 CHECK HARNESS AND CONNECTOR(EGR VALVE POSITION SENSOR −ECM)
(a) Disconnect the E18 EGR valve position sensor connec-
tor.
(b) Disconnect the E12 ECM connector.
(c) Check the resistance between the wire harness side con- nectors.
Standard (Check for open):
Tester ConnectionSpecified Condition
EGLS (E18 −3) −EGLS (E12 −33)Below1
E2 (E18 −2) −E2 (E13 −28)Below 1

Standard (Check for short):
Tester ConnectionSpecified Condition
EGLS (E18 −3) or EGLS (E12 −33) −Body ground10 k
or higher
(d) Reconnect the EGR valve position sensor connector.
(e) Reconnect the ECM connector.

05−402
−
DIAGNOSTICS ECD SYSTEM (1CD−FTV)(From September, 2003)
AVENSIS Supplement (RM1045E)
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM (See page 10− 29)

− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−393
AVENSIS Supplement (RM1045E)
DTC P0400 EXHAUST GAS RECIRCULATION FLOW
CIRCUIT DESCRIPTION
The EGR system recirculates exhaust gases, and which is controlled to the proper volume to be suited every
driving condition. The recirculated gas mingles with the intake air, therefore the EGR system can slow down
engine combustion and let the combustion temperature down. This helps reduce a NOx emission.
In order to increase a circulatory efficiency, the ECM adjusts the lift amount of the EGR valve and intake
shutter valve (throttle valve).
DTC No.DTC Detection ConditionTrouble Area
P0400Target and actual positions of the EGR valve is different
(1trip detection logic)
SEGR valve stuck
SEGR valve does not move smoothly
SOpen or short in EGR circuit
SOpen or short in EGR valve position sensor circuit
SEGR valve position sensor
SECM
05I7N−01