Hino 238, Workshop Manual

Page: 846 / 919

DEF SCR SYSTEM (DCU) 5–280
3
Inspect the
DEF injector 2
[Hino-DX]
1. Set the starter switch to the
"LOCK" position.
2. Replace DEF injector with a
new one. (Do not install it on
the muffler.)
3. Set the starter switch to the
"ON" position.
4. Perform DEF addition test
as same as step 2.
Operation is
normal: Go to
YES.
Operation is
abnormal: Go
to NO.
New injector
installed in the
muffler. Proce-
dure com-
pleted.
After installing
the injector,
idle the engine
(for about 10
min.) and from
the menu
[Data Monitor]
check if the
DEF is stable
between
800 kPa
{116 psi} and
1,051 kPa
{152 psi}.
Perform "After-
inspection
work" of
INFORMA-
TION section. Re-install the
DEF injector
and replace
the DEF pipe
(pressure
line).
After replac-
ing the pipe,
idle the engine
(for about 10
min.) and from
the menu
[Data Monitor]
check if the
DEF is stable
between 800
kPa {116 psi}
and 1,051 kPa
{152 psi}.
Perform "After-
inspection
work" of
INFORMA-
TION section.
DTC: P20F4 DEF consumption failure Inspection Procedure
Step Action Description Judgement
Check
(Yes/No)
Yes No