Hino 238, Workshop Manual

Page: 117 / 919

ENGINE CONTROL SYSTEM (J08E) 4–894
5
Check the
response
delay of the
EGR valve
[Hino-DX]
Select [Check functions] and then
[EGR check] from Hino-DX menu,
then inspect the response delay
at the Target EGR position and
Actual EGR position.
! CAUTION
Perform the inspection while
the engine is stopped to avoid
damages.
<Inspection procedure>
(1) Select [Check functions].
(2) Select [EGR check].
(3) Click [Check start].
(4) Select [EGR opening UP]:
• Inspect the response delay
at each step of the Target
EGR position and Actual
EGR position from 0 to 100
%.
(5) Select [EGR opening DOWN]:
• Inspect the response delay
at each step of the Target
EGR position and Actual
EGR position from 100 to 0
%.
HINT
The EGR opening position
changes of around 10 % per
step between 0
–
100 %.
<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.
Replace the
engine ECU.
Perform "After-
inspection
work" of
INFORMA-
TION section. Replace the
EGR valve.
Perform "After-
inspection
work" of
INFORMA-
TION section.
DTC: P14BF
EGR valve controller temperature sensor 1, 2 -
rationality (EGR actuator temp. sensor 1 perfor-
mance invalid)
Inspection procedure
Step Action Description Judgement
Check
(Yes/No)
Yes No