Hino 238, Workshop Manual

Page: 293 / 919

ENGINE CONTROL SYSTEM (J08E) 4–1070
12
Inspect the
ambient air
temperature
sensor
1. Check the installation of the
ambient air temperature
sensor.
2. Make sure there is no dirt or
damage to the ambient air
temperature sensor.
Failure found:
Go to YES.
No failure
found: Go to
NO.
Clean the
ambient air
temperature
sensor and
install it prop-
erly.
If damaged,
replace the
ambient air
temperature
sensor.
Perform "After-
inspection
work" of
INFORMA-
TION section.
Go to step 13.
13
Inspect the
ambient air
temperature
sensor unit
Measure the resistance between
the terminals of the ambient air
temperature sensor.
<Tester connections>
Ambient air temperature sensor
HH1+
–
HH1-
<Standard values>
25

C {77

F}: 1.7 k

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 14.
Replace the
sensor.
Perform "After-
inspection
work" of
INFORMA-
TION section.
14
Inspection of
the DEF injec-
tor [Hino-DX]
Remove the DEF injector from the
muffler and select [Check func-
tions] in Hino-EX menu [ECU] and
inspect the operation of DEF
injector.
<Inspection procedure>
(1) Select [Check functions].
(2) Select [DEF addition test].
(3) Perform addition test as
instructed on the Hino-DX screen.
(Perform all three patterns)
NOTICE
When the DEF tank tempera-
ture is -5

C (23

F) or lower,
perform warm-up to raise it to
10

C (50

F) or higher.
HINT
Refer to the section "System
individual function" in the
chapter "HINO Diagnostic
eXplorer" for detail of DEF
addition test.
Operation nor-
mal: Go to
YES.
Abnormal: Go
to NO.
Go to step 15.
Replace the
DEF injector.
(After replac-
ing the engine
ECU, execute
a DPR forced
regeneration.)
Perform "After-
inspection
work" of
INFORMA-
TION section.
DTC: P2214
NOx sensor (SCR downstream)
- Performance and Monitoring capability
Inspection procedure
Step Action Description Judgement
Check
(Yes/No)
Yes No