Hino 238, Workshop Manual

Page: 183 / 919

ENGINE CONTROL SYSTEM (J08E) 4–960
CHECKLIST: P2100
DTC: P2100
DC motor for intake throttle valve - circuit
(Open circuit (circuit low))
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 it.
Perform "After-
inspection
work" of
INFORMA-
TION section.
Go to step 3.
3
Inspect the
diesel throttle
power supply
Measure the voltage of the diesel
throttle vehicle-side connector ter-
minals MOT+ and 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
Measure the voltage between the
terminals MOT+ and MOT- of the
engine ECU (signal check har-
ness).
<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.