Hino 238, Workshop Manual

Page: 897 / 919

DEF SCR SYSTEM (DCU) 5–331
CHECKLIST: P2212
DTC: P2212 NOx sensor (SCR downstream) - Feedback Inspection Procedure
Step Action Description Judgement
Check
(Yes/No)
Yes No
1
Check the
DTC detected
(DCU) [Hino-
DX] Check if any DTC other than
P2212 (for example, P2215,
P2216, P2222, U029E) has been
detected in [DCU].
DTC other
than P2212
(for example,
P2215, P2216,
P2222,
U029E) has
been detected:
Go to YES.
No DTC has
been detected:
Go to NO.
Go to diagno-
sis procedure
of a related
DTC.
Go to step 2.
2
Inspect the
NOx sensor 2
(SCR down-
stream)
Swap the NOx sensor 1(SCR
upstream) and NOx sensor 2
(SCR downstream), connect them
and check if DTC P2212 has
been detected.
1. Swap the positions of the
NOx sensor 1 and 2, and
attach them to the vehicle.
2. Erase the malfunction his-
tory using Hino-DX.
3. After DPR forced regenera-
tion, check if P2212 is
detected in the [DCU].
DTC P2212
has been
detected: Go
to YES.
No DTC has
been detected:
Go to NO.
Go to step 3.
Replace the
NOx sensor 2.
Perform "After-
inspection
work" of
INFORMA-
TION section.
3
Inspect the
engine cool-
ant tempera-
ture sensor
1. Check the installation of the
engine coolant temperature
sensor.
2. Make sure there is no dirt or
damage to the engine cool-
ant temperature sensor.
The output
value and the
measured
value match:
Go to YES.
The output
value and the
measured
value do not
match: Go to
NO.
Clean the
engine cool-
ant tempera-
ture sensor
and connect
securely.
Repair the
sensor if
needed.
Go to step 4.
4
Check the
engine cool-
ant tempera-
ture sensor
output signal
[Hino-DX]
Select [Engine coolant tempera-
ture] from [Data Monitor] on the
menu. When the engine coolant
temperature (actual measured
value) is 50 °C {122 °F}, check if
the temperature output by the
engine coolant temperature sen-
sor is 50 °C {122 °F}.
<Standard values>
The output value and the mea-
sured value match.
The output
value and the
measured
value match:
Go to YES.
The output
value and the
measured
value do not
match: Go to
NO.
Go to step 5.
Replace the
engine cool-
ant tempera-
ture sensor.
Perform "After-
inspection
work" of
INFORMA-
TION section.