Hino 238, Workshop Manual

Page: 198 / 919

ENGINE CONTROL SYSTEM (J08E) 4–975
CHECKLIST: P2103
DTC: P2103
DC motor for intake throttle valve - circuit
(Short-circuit (circuit high))
Inspection procedure
Step Action Description Judgement
Check
(Yes/No)
Yes No
1
Inspect the
diesel throttle
connector Check the connection of the die-
sel throttle connector (Looseness
and poor contact).
Failure found:
Go to YES.
No failure
found: Go to
NO.
Connect
securely,
repair if
needed.
Perform "After-
inspection
work" of
INFORMA-
TION section.
Go to step 2.
2
Inspect the
diesel throttle
Disconnect the diesel throttle
from the vehicle and confirm that
there is no damage due to snag-
ging or incursion of foreign sub-
stances.
Failure found:
Go to YES.
No failure
found: Go to
NO.
Clean the die-
sel throttle. If
necessary,
replace the
diesel throttle.
Perform "After-
inspection
work" of
INFORMA-
TION section.
Go to step 3.
3
Inspect the
diesel throttle
power supply
Disconnect the diesel throttle con-
nector and measure the voltage
of the diesel throttle vehicle-side
connector terminals. (MOT+
–
MOT-)
<Standard values>
8
–
16 V
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 5. Go to step 4.
4
Inspect the
diesel throttle
power supply
harness
Connect the signal check harness
to the engine ECU and measure
the voltage between the engine
ECU (signal check harness) ter-
minals. {MOT+(E1)
–
MOT-(E21)}
<Standard values>
8
–
16 V
The measure-
ments meet
the standard
value: Go to
YES.
The measure-
ments do not
meet the stan-
dard value: Go
to NO.
Repair or
replace the
harness.
Perform "After-
inspection
work" of
INFORMA-
TION section.
Replace the
engine ECU.
Perform "After-
inspection
work" of
INFORMA-
TION section.
5
Check the
operation of
the diesel
throttle [Hino-
DX]
Connect the diesel throttle and
select [Activation Test] and check
the operation of the diesel throttle
valve.
Operation nor-
mal: Go to
YES.
Operation not
normal: Go to
NO.
Go to step 6.
Replace the
diesel throttle.
Perform "After-
inspection
work" of
INFORMA-
TION section.