Hino 238, Workshop Manual

Page: 127 / 919

ENGINE CONTROL SYSTEM (J08E) 4–904
CHECKLIST: P1530
DTC: P1530 Engine stop switch malfunction Inspection procedure
Step Action Description Judgement
Check
(Yes/No)
Yes No
1
Inspect the
engine stop
switch
Check the installation of the
engine stop switch.
Failure found:
Go to YES.
No failure
found: Go to
NO.
Install the
engine stop
switch cor-
rectly.
Perform "After-
inspection
work" of
INFORMA-
TION section.
Go to step 2.
2
Inspect the
engine stop
switch connec-
tor
Check the connection of the
engine stop switch 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 3.
3
Inspect the
engine stop
switch unit Disconnect the engine stop switch
connector to perform a unit test of
the engine stop switch.
Failure found:
Go to YES.
No failure
found: Go to
NO.
Replace the
engine stop
switch.
Perform "After-
inspection
work" of
INFORMA-
TION section.
Go to step 4.
4
Inspect for
power supply
short-circuit in
the wire har-
ness of the
engine stop
switch
Connect the signal check harness
to the engine ECU vehicle-side
harness. (Do not connect harness
to the ECU.) and measure the
voltage between the terminals of
the engine ECU (signal check
harness).
<Tester connections>
Engine ECU (signal check har-
ness)
STOP(V32)
–
PGD4(V80)
<Standard values>
Less than 1 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.
Repair or
replace the
harness.
Perform "After-
inspection
work" of
INFORMA-
TION section.