Hino 238, Workshop Manual

Page: 428 / 919

ENGINE CONTROL SYSTEM (J08E) 4–1205
8
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) 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
%.
<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 9.
Replace the
EGR valve.
Perform "After-
inspection
work" of
INFORMA-
TION section.
9
Inspect the
diesel throttle
valve
Check the working condition of
the diesel throttle valve. (Connec-
tion or valve opening degree
abnormalities)
Failure found:
Go to YES.
No failure
found: Go to
NO.
Replace the
diesel throttle
valve.
Perform "After-
inspection
work" of
INFORMA-
TION section.
Go to step 10.
10
Inspect the
SCV [Hino-
DX]
1. Perform an SCV test and a
malfunction reproduction
test.
•
For a detailed procedure,
refer to the separate "SCV
free acceleration test" in the
following pages.
Failure found:
Go to YES.
No failure
found: Go to
NO.
Repair or
replace the
faulty part.
Perform "After-
inspection
work" of
INFORMA-
TION section.
Go to step 11.
DTC: P2457 EGR cooler performance Inspection procedure
Step Action Description Judgement
Check
(Yes/No)
Yes No