Page 4449 of 5135

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)Below1E2 (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.
Page 4450 of 5135
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)
Page 4451 of 5135
− 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
Page 4452 of 5135
A93020
Malfunction Detection:
Abnormal
(Does not move smoothly) EGR Valve Opening
Position (Target)
Normal
Open
EGR Valve Position Sensor
Opening Position (Actual)Close
Abnormal
(Stuck)
Time
Threshold
Malfunction CounterDetect P0400Open
Close 05−394
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
AVENSIS Supplement (RM1045E)
MONITOR DESCRIPTION
When the target and actual positions of the EGR valve is different, the ECM interprets this as malfunction
of the EGR valve and illuminates the CHK ENG.
Page 4453 of 5135

A91220
MREL B−W
GR8
3 EFI MAIN Relay
W−BE9 E12
2 IE1
EE1
EFIB−R
(LHD) 1
B5
Battery FL MAINE17
EGR Valve
EGRS 3
1
1
1
1A 1 1
121 2R−L
B−W 10GR
Engine Room R/B No.1ECM
2
1
Engine Room
R/B No. 3 3
3 B
EC B−Y
(RHD)
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−395
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 P0400 malfunction is set1second or more passed after quickly accelerat-
ing the engine from idling.
1CHECK OTHER DTC OUTPUT(IN ADDITION TO P0400)
(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
P0400A
P0400 and P0405 and/or P0406B
HINT:
If any other codes besides P0400 are output, perform troubleshooting for those DTCs first.
Page 4454 of 5135

A93008
EGR Valve
Component Side:
E17
1
2
05 −396
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
B GO TO RELEVANT DTC CHART
(See page 05 −299)
A
2 READ VALUE OF HAND −HELD TESTER(EGR VALVE POS)
(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 EGR VALVE POS” and read its value displayed on the hand −held tester.
Result:
ConditionResultProceed to
After engine warm −up, quickly accelerateConstant or changes slowlyAAfter engine warm up, quickly accelerate
the engine from idling to 3,000 rpm by us-
ing accelerator pedalSmooth changes from approximately 3.0 V to
approximately 2.0 VB
HINT:
EGR valve closed: EGR VALVE POS is 4.0 V
EGR valve open: EGR VALVE POS is 2. 1 V
B CHECK FOR INTERMITTENT PROBLEMS (See page 05 −270)
A
3 INSPECT EGR VALVE ASSY(RESISTANCE)
(a) Disconnect the E 17 EGR valve connector.
(b) M easur e t he r esist ance bet ween t he t er m inals of t he
EGR valve.
Standard:
Tester ConnectionSpecified Condition
1−2approximately 7.0 at 20 _ C (68 _ F)
(c) Reconnect the EGR valve connector.
NG REPLACE EGR VALVE ASSY (See page 14−1 08)
OK
Page 4455 of 5135

A85349
E17
Wire Harness Side:
EGR Valve Connector
Front View
A81087
E12
ECM ConnectorEGRS
A66056
Engine Room R/B No.1:
EFI MAIN Relay
A85349
E17
Wire Harness Side:
EGR Valve Connector
Front View
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−397
AVENSIS Supplement (RM1045E)
4 CHECK HARNESS AND CONNECTOR(EGR VALVE ASSY−ECM)
(a) Disconnect the E17 EGR valve connector.
(b) Disconnect the E12 ECM connector.
(c) Check the resistance between the wire harness side con-
nectors.
Standard (Check for open):
Tester ConnectionSpecified Condition
EGRS (E12−3)−EGR valve (E17−1)Below1E2 (E13−28)−(E17−2)Below1
Standard (Check for short):
Tester ConnectionSpecified Condition
EGRS (E12−3) or EGR valve (E17−1)−Body ground10kor higher
(d) Reconnect the EGR valve connector.
(e) Reconnect the ECM connector.
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
5 CHECK HARNESS AND CONNECTOR(EGR VALVE−EFI MAIN RELAY)
(a) Remove the EFI MAIN relay from the engine room R/B
No.1.
(b) Disconnect the E17 EGR valve connector.
(c) Check the resistance between the wire harness side con-
nectors.
Standard (Check for open):
Tester ConnectionSpecified Condition
EFI MAIN relay (1)−EGR valve (E17−2)Below1
Standard (Check for short):
Tester ConnectionSpecified Condition
EFI MAIN relay (1) or EGR valve (E17−8)−Body ground10kor higher
(d) Reinstall the EFI MAIN relay.
(e) Reconnect the EGR valve connector.
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
Page 4456 of 5135
A66060
E12
ECM Connector EGRS
E 1
A9 1226
Signal Waveform
5V/
Division
GND
5 msec./Division
EGRS
05
−398
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
6 INSPECT ECM(EGR VALVE ASSY VOLTAGE)
(a) Inspect using the oscilloscope.
(b) During idling, check the waveform between the specified
terminals of the E 12 ECM connector.
Standard:
Tester ConnectionSpecified Condition
EGRS (E 12− 3) − E1 (E 12− 7)Correct waveform is as shown
NG REPLACE ECM (See page 10− 29)
OK
REPLACE EGR VALVE ASSY (See page 14−1 08)