Hino 238, Workshop Manual

Page: 334 / 919

ENGINE CONTROL SYSTEM (J08E) 4–1111
CHECKLIST: P240F
DTC: P240F EGR flow slow response Inspection procedure
Step Action Description Judgement
Check
(Yes/No)
Yes No
1
Check the
response
delay of the
EGR valve
[Hino-DX]
Select [Check functions] and then
[EGR check] from the menu, then
inspect the response delay at the
Target EGR position and Actual
EGR position.
<Inspection procedure>
(1) Select [Check functions].
(2) Select [EGR check].
(3) Click [Check start].
(4) Click [EGR opening UP]:
•
Inspect the response delay
at each step of the Target
EGR position and Actual
EGR position from 0 to 90
%.
(5) Select [EGR down]:
•
Inspect the response delay
at each step of the Target
EGR position and Actual
EGR position from 90 to 0
%.
<Standard values>
From the Target EGR position to
the Actual EGR position, the
response delay should be within 5
seconds.
The measure-
ments meet
the standard
value: Go to
YES.
The measure-
ments do not
meet the stan-
dard value: Go
to NO.
Go to step 2.
Replace the
valve.
Perform "After-
inspection
work" of
INFORMA-
TION section.
2
Check the
response
delay of the
VNT controller
[Hino-DX]
Select [Check functions] from the
menu, then inspect the response
delay at the Target VNT position
and Actual VNT position.
<Inspection procedure>
(1) Select [Check functions].
(2) Select [VNT check].
(3) Click [Check start].
(4) Select [VNT opening UP]:
•
Inspect the response delay
at each step of the Target
VNT position and Actual
VNT position from 0 to 90
%.
(5) Select [VNT opening DOWN]:
• Inspect the response delay
at each step of the Target
VNT position and Actual
VNT position from 90 to 0
%.
<Standard values>
From the Target VNT position to
the Actual VNT position, the
response delay should be within 3
seconds.
The measure-
ments meet
the standard
value: Go to
YES.
The measure-
ments do not
meet the stan-
dard value: Go
to NO.
Go to step 3.
Replace the
turbocharger.
Perform "After-
inspection
work" of
INFORMA-
TION section.