Hino 238, Workshop Manual, Page: 427 / 919

ENGINE CONTROL SYSTEM (J08E) 4–1204
5
Inspect the
EGR cooler 1
Check if soot is obstructing the
inlet/outlet of the EGR cooler gas
passageway.
Failure found:
Go to YES.
No failure
found: Go to
NO.
Remove the
soot in the
inlet/outlet of
the gas pas-
sageway, go to
step 6.
Go to step 6.
6
Inspect the
EGR cooler 2
1. Check if there are foreign
substances stuck to the
EGR cooler coolant pas-
sageway.
2. Check the EGR cooler cool-
ant passageway for obstruc-
tion due to deformation or
other damage.
3. Check if coolant is leaking
from the EGR cooler.
Failure found:
Go to YES.
No failure
found: Go to
NO.
Remove the
soot in the gas
passageway
inlet/outlet, or
repair or
replace the
faulty part.
If the only
cause of the
malfunction
was soot, go
to step 6.
Go to step 7.
7
Inspect the
EGR valve
1. Check the EGR valve for
damage due to incursion of
foreign substances.
2. Check if the inlet/outlet of
the exhaust gas passage-
way is obstructed by soot.
Failure found:
Go to YES.
No failure
found: Go to
NO.
Remove for-
eign sub-
stances and
clean the pas-
sageway.
Replace the
EGR valve if it
is damaged.
Perform "After-
inspection
work" of
INFORMA-
TION section.
Go to step 8.
DTC: P2457 EGR cooler performance Inspection procedure
Step Action Description Judgement
Check
(Yes/No)
Yes No