Hino 238, Workshop Manual

Page: 174 / 919

ENGINE CONTROL SYSTEM (J08E) 4–951
CHECKLIST: P20EE
DTC: P20EE NOx converting catalyst conversion efficiency Inspection procedure
Step Action Description Judgement
Check
(Yes/No)
Yes No
1
Inspect the
DEF Measure DEF concentration.
<Standard values>
32.5 ± 2.5 %
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 2.
Replace the
DEF solution.
If the DEF
concentration
is below the
standard,
drain the DEF
solution
through the
tank drain with
the starter
switch ON,
and then refill
the tank with
at least 5 liters
{1.3 gallons} of
DEF.
Afterward,
drive the vehi-
cle and con-
firm that the
problem does
not recur
under driving
conditions.
Perform "After-
inspection
work" of
INFORMA-
TION section.
2
Perform a
basic engine
check [Hino-
DX]
Perform a basic engine check
using the Engine Basic Check-
sheet.
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 3.
3
Inspect the air
flow sensor
1. Check the installation of the
air flow sensor.
2. Make sure there is no dirt or
damage to the air flow sen-
sor.
Failure found:
Go to YES.
No failure
found: Go to
NO.
If damaged,
replace the
sensor.
Perform "After-
inspection
work" of
INFORMA-
TION section.
Go to step 4.