P0401: Egr Low Flow; Dtc: P0401 - Hino Motors HINO 155 series Workshop Manual

DTC: P0401

P0401: EGR low flow

INFORMATION
Reference
A
A
Gas passage
A-A
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 2,250 – 2,500 r/min.
30 - 50 mm
• Engine speed fluctuation ≤ 117.2 r/min/sec.
• Fuel injection rate fluctuation ≤ 54.7 mm
• 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.
ENGINE (J05E)/TROUBLESHOOTING
Body earth
B
B
Common rail
pressure sensor
Intake manifold
temperature sensor
Boost pressure sensor
B-B
temperature sensor
(air flow sensor built in)
3
/st. cyl. sec.
Coolant temperature sensor
(THW)
X66
(E)
Z5G
EBK
(E1)
EBJ
(PCR1)
EBH
(VC1)
EBN
(E2)
EBM
(PCR2)
EBL
(VC2)
Z7Q
(E2)
X0Q
(THA)
J0M
(VC)
J0L
(PIM)
Z6R
(E)
X71
(FC)
XCV
(E2G)
Intake air
XCT
(+B)
Z65
(E2)
X72
(THA)
3
/st. cyl. with an engine speed of 2,000 – 2,250 r/min, or the rate is
EN01H02127030602016074
Engine ECU
10mA X28 (THW)
10mA
ZJQ (E5)
$XV
(PC1S)
15mA
Z70
(E1)
2mA XZG
(PCR1)
15mA
X85
(VC)
15mA
Z72
(E2)
2mA XZH
(PCR2)
15mA
XG2
(VC2)
$XW (PC2S)
10mA
10mA XZJ
(THIA)
15mA
5mA X0G (PIM)
15mA
ZJP (E4)
10mA
X4K (VG)
200mA
XMH
(EVG)
200mA X2U
(VAF)
10mA
10mA X82
(THA)
SHTS021270300431
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