Page 705 of 5135
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
05±639
AVENSIS REPAIR MANUAL (RM1018E)
CHECK DTC OUTPUT RECUR (DTC P0488 OUTPUT AGAIN)
HINT:
After clearing the DTC, start the engine and let it idle for 30 seconds and accelerate the vehicle speed to
60 km/h (37 mph) with the accelerator pedal opened more than the half angle, then confirm P0488 is not
set again.
Page 706 of 5135
A81006
ECM
E3
EGR Valve Assy
G
EG+A 6
E12
Y±G
R±L
G±BE12
E12
E125
4
3EG±A
EG+B
EG±B 6
4
3
1From EFI MAIN Relay
5
2B±W
B±W
B±W
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
05±629
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0400 EXHAUST GAS RECIRCULATION FLOW
DTC P0403 EXHAUST GAS RECIRCULATION CONTROL
CIRCUIT
CIRCUIT DESCRIPTION
DTC No.DTC Detection ConditionTrouble Area
P0400Mass air flow rate is not changed when turning on EGR valveEGR valve assy
Open or short in EGR circuit
P0403EGR valve assy motor malfunction
Oen or short in EGR circuit
EGR passage
ECM
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using
Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running
or stopped, the engine was warmed up or not, etc. at the time of the malfunction.
05CPU±01
Page 707 of 5135

A82939
+B2
+B1EGR2
EGR1 EGR4
EGR3
05±630
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
1CHECK OTHER DTC OUTPUT(BESIDES P0400 AND/OR P0403)
(a)Read the DTC using the hand±held tester.
Result:
Display (DTC output)Proceed
P0400 and/or P0403 are outputA
P0400 and/or P0403 and other DTCs are outputB
HINT:
If any other codes besides P0400 and/or P0403 are output, perform the trou\
bleshooting for those DTCs first. BGO TO RELEVANT DTC CHART(See page 05±544)
A
2READ VALUE OF HAND±HELD TESTER(MASS AIR FLOW RATE)
(a)Connect the hand±held tester to the DLC3.
(b)Turn the ignition switch ON and push the hand±held tester main switch \
ON.
(c)Start the engine.
(d)Warm up the engine, the engine coolant temperature should be above 75 C (167 F) and bellow 90 C
(194 F).
(e)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / MAFº.
(f)Check that the MAF reading during idling. Result: MAF greater than 4 g/s but less than 16 g/s
(g)Force the EGR valve to operate with a hand±held tester, make the valve opening 0, and check that
the AFM reading during idling.
Result: MAF greater than 10 g/s but less than 16 g/s
NGREPLACE EGR VALVE ASSY (See page 14±286)
OK
3INSPECT EGR VALVE ASSY
(a)Check the EGR valve for resistance. (1)Measure the resistance between the specified ter-minals.
Resistance:
Terminal No.Specified condition
+B1 ± EGR119.6 1.4
+B1 ± EGR219.6 1.4
+B2 ± EGR319.6 1.4
+B2 ± EGR419.6 1.4
NGREPLACE EGR VALVE ASSY
(See page 14±286)
OK
Page 708 of 5135

A56871
E3
Wire Harness SideS2S1 S4
S3
EGR Valve Connector
A81087
E12
ECM Connector
EG+A
EG±A EG+BEG±B
A66060
E12
ECM Connector
EG+A
EG±A EG±B
E1
EG+B
A09818
Signal Waveform
10 V/
Division
GND
0.5 msec./Division
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
05±631
AVENSIS REPAIR MANUAL (RM1018E)
4CHECK HARNESS AND CONNECTOR(EGR VALVE ASSY ± ECM)
(a)Disconnect the E2 EGR valve connector.
(b)Disconnect the E12 ECM connector.
(c)Check for continuity between the wire harness side con-
nectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
EG+A (E12±6) ± S3 (E3±6)
EG±A (E12±5) ± S1 (E3±4)ContinuityEG+B (E12±4) ± S4 (E3±3)Continuity
EG±B (E12±3) ± S2 (E3±1)
Standard (Check for short):
Symbols (Terminal No.)Specified condition
EG+A (E12±6) or S3 (E3±6) ± Body ground
EG±A (E12±5) or S1 (E3±4) ± Body groundNocontinuityEG+B (E12±4) or S4 (E3±3) ± Body groundNo continuity
EG±B (E12±3) or S2 (E3±1) ± Body ground
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
5INSPECT ECM(EGR VALVE ASSY VOLTAGE)
(a)Inspect using the oscilloscope.
(b)During idling, check the waveform between the specified terminals of the E12 ECM connector.
Standard:
Symbols (Terminal No.)Specified condition
EG+A (E12±6) ± E1 (E12±7)
EG±A (E12±5) ± E1 (E12±7)CorrectwaveformisasshownEG+B (E12±4) ± E1 (E12±7)Correct waveform is as shown
EG±B (E12±3) ± E1 (E12±7)
NGREPLACE ECM (See page 10±65)
OK
Page 709 of 5135
05±632
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
6CHECK DEPOSIT(EGR VALVE ASSY)
NGREMOVE FOREIGN OBJECT AND CLEAN EGR VALVE
OK
7CHECK DEPOSIT(EGR PASSAGE)
NGREPAIR OR REPLACE
OK
8CHECK FOR EXHAUST GAS LEAKS
NGREPAIR EXHAUST GAS LEAKAGE POINT
OK
REPLACE ECM (See page 10±65)
Page 710 of 5135

A81017
GeneratorGlow Plug ECMGLOW
Relay Battery
A81018
Ignition Switch
Glow Plug
Engine Speed
Starting EngineAfter Glow Time OFFOFF ON ON
OFF After Glow System
(sec.)
1
020
6840
104(C)
(F)
After Glow Time
Engine Coolant Temperature 120 05±622
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0380 GLOW PLUG/HEATER CIRCUIT ºAº
CIRCUIT DESCRIPTION
The glow plug is mounted inside the engine combustion room. To ensure efficient engine starting with a cold
engine, the ECM calculates time the current needs to flow into the glow plug depending on the engine cool-
ant temperature after the ignition switch is turned ON. The ECM then turns on the glow relay and permits
the current to flow into the glow plug. The glow plug is then heated and enhances fuel combustion with the
cold engine.
This DTC will be set if there is open in glow plug itself or its circuit.
The ECM performs the after glow for a certain period of time depending on the engine coolant temperature
after the engine has been started. After glow reduces a diesel engine knocking, a white smoke, and etc with
a cold engine.
05CPT±01
Page 711 of 5135

± DIAGNOSTICSECD SYSTEM (1CD±FTV)
05±623
AVENSIS REPAIR MANUAL (RM1018E)DTC No.
DTC Detection ConditionTrouble Area
P0380
When the glow plug is turned from ON to OFF, or vice±versa,
conditions (a) and (b) are satisfied:
(a) Battery voltage dos not change
(b) Duty signal from terminal M of the generator does not
changeOpen or short in glow plug circuit
Glow fuse
Glow relay
Glow plug
ECM
MONITOR DESCRIPTION
When starting a cold engine, the ECM supplies the current to the glow plug for a certain period of time. As
the supplying current to the glow plug is terminated, the large current is suddenly cut off, therefore the battery
voltage then varies and also terminal M output (duty ratio) of the generator varies. If these variations are not
occurred when the glow plug is turned from ON to OFF, or vice±versa, the ECM realizes that the current has
not been supplied to the glow plug, and interprets this as open malfunction of the glow plug or glow plug
circuit.
MONITOR STRATEGY
Required sensorsGlow plug circuit
Frequency of operationTwice per driving cycle
Duration3 min.
CHK ENG operation2 driving cycles
TYPICAL ENABLING CONDITIONS
ItemSpecificationItemMinimumMaximum
Battery voltage11 V±
Engine speed700 rpm2,000 rpm
Engine coolant temperature±40C (104F)
Engine speed is stable±
Time after engine start8 sec.±
Any switches that vary electrical load
have not been being operated±
The monitor will not run if the generator circuit is malfunctioning
TYPICAL MALFUNCTION THRESHOLDS
Threshold
When the battery voltage, or terminal M output (duty ratio) of the generator does not change, despite turning the glow plug from ON to OFF, or
vice±versa
Page 712 of 5135
A81005
ECM
ALT 8
E13
IK1 G±Y
G2
GLOW
Relay1
2 3
G1
Glow Plug110
GLOW
Battery
EI R
4 B±L
B
FL
MAIN
BR B
ALT
12
12
33
BB
Engine Room
R/B No. 3
IJBR BR
B
B 3
333
1 25 15DH
DN 1 DH
18DB 9 DA ECU±IG I13
Ignition Switch 3
1
AM1AM1 IG1
G±R
ED1 1
WDriver
Side J/B
IG1
RelayA12 1
BB±L
A11 3
MY
A11 4
LRL 9
E12
Generator
IG S
2A11
1 A11 A11
R±W B
IK21
EE1 5GREL 14
E9
R
R
B
R±W R±W
W±B
G J10(LHD)
C J20(RHD)
J/C
G J10(LHD)
C J20(RHD)
ALT±SEFI
1 2
1 2 11
11AEngine
Room
R/B No. 1 IE3 7 (LHD)
(RHD)
IO1 7BATT 2
E10
E1 7
E12 B±Y
B±Y
B 05±624
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM