ENGINE (J05E)/TROUBLESHOOTING 2–467
DTC: P0401
EN01H02127030602016074
P0401: EGR low flow
INFORMATION
1. Technical description
• The measured EGR rate, which is calculated from the air flow sensor, boost pressure sensor, and intake manifold
temperature sensor, is compared with the predicted EGR rate, and malfunction is detected.
<Description of malfunction>
• –
2. DTC set condition
(1) DTC detection condition
• Either the fuel injection rate is 30 - 90 mm
3
/st. cyl. with an engine speed of 2,000 – 2,250 r/min, or the rate is
30 - 50 mm
3
/st. cyl. with an engine speed of 2,250 – 2,500 r/min.
• Engine speed fluctuation ≤ 117.2 r/min/sec.
• Fuel injection rate fluctuation ≤ 54.7 mm
3
/st. cyl. sec.
• Predicted EGR flow rate ≥ 35 g/sec.
• Atmospheric pressure ≥ 75 kPa.
• Exhaust brake is not actuated.
(2) Judgement criteria
• The value of parameters calculated from the measured EGR rate, predicted EGR rate, and EGR valve feed-
back quantity is at least 0.2 conditions continue for at least 30 seconds.
3. Reset condition
• After normal operation is restored and the starter key is turned "LOCK".
4. Indication, warning or system control regulation when the DTC is set.
• MIL: ON
• SVS light: OFF
• Engine output is restricted.
B
B
A
A
Z7Q
(E2)
X0Q
(THA)
(THIA)
XZJ
10mA
10mA
Intake air
temperature sensor
(air flow sensor built in)
$XW
(PC2S)
(E1)
X85
XZG
Z70
$XV
(PCR1)
(VC1)
(E2)
(PCR2)
(VC2)
(E)
(THW)
Z72
XZH
(VC2)
(PCR2)
(E2)
(VC)
(PCR1)
(E1)
(PC1S)
XG2
Z6R
EBJ
EBH
EBN
EBM
EBL
EBK
J0L
XCV
X71
XCT
Z65
J0M
(VC)
(PIM)
(E)
(FC)
(E2G)
(+B)
(E2)
X72
(THA)
X4K
(VG)
ZJP
(E4)
X0G
(PIM)
Z5G
X66
ZJQ
(E5)
X28
(THW)
(EVG)
XMH
(VAF)
X2U
(THA)
X8210mA
10mA
10mA
15mA
5mA
10mA
200mA
200mA
15mA
15mA
2mA
2mA
10mA
15mA
15mA
15mA
Common rail
pressure sensor
Boost pressure sensor
Intake manifold
temperature sensor
Engine ECU
A-A B-B
Coolant temperature sensor
Gas passage
Reference
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