Hino 238, Workshop Manual

Page: 318 / 919

ENGINE CONTROL SYSTEM (J08E) 4–1095
2
Check the
response
delay of the
EGR valve
[Hino-DX]
Check the time lag (following
characteristics) of the target EGR
valve opening and actual EGR
valve opening.
! CAUTION
Perform the inspection while
the engine is stopped to avoid
engine damages.
<Inspection procedure>
(1) Select [Check functions].
(2) Select [EGR check].
(3) Click [Check start].
(4) Click [EGR opening UP]:
• Check each step from 0 %
–
100 % of the time lag (fol-
lowing characteristics) of the
target EGR valve opening
and actual EGR valve open-
ing.
(5) Click [EGR opening DOWN]:
• Check each step from 100
%
–
0 % of the time lag (fol-
lowing characteristics) of the
target EGR valve opening
and actual EGR valve open-
ing.
HINT
In EGR openings from 0 %
–
100 %, 1 step corresponds to a
10 % change.
<Standard values>
For the specified EGR opening,
time lag (response lag) is less
than 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 3.
Replace the
EGR valve.
Perform "After-
inspection
work" of
INFORMA-
TION section.
3
Inspect air
cleaner ele-
ment
1. Check there is no dirt, dam-
age or clogging in the air
cleaner element.
2. Make sure the element is a
Hino genuine part.
Failure found:
Go to YES.
No failure
found: Go to
NO.
Clean or
replace the air
cleaner ele-
ment.
Perform "After-
inspection
work" of
INFORMA-
TION section.
Go to step 4.
4
Check the air
intake system
Check the air intake system
(between air flow sensor and die-
sel throttle) for dirt, clogging, or
damage.
Failure found:
Go to YES.
No failure
found: Go to
NO.
Clean or
replace the
faulty part.
Perform "After-
inspection
work" of
INFORMA-
TION section.
Go to step 5.
DTC: P226C Boost pressure slow response Inspection procedure
Step Action Description Judgement
Check
(Yes/No)
Yes No