Chapter 9 Electrical
System
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3,4JH3(B)(C)E
7. Warning Devices
7-1 Oil pressure alarm
It the engine oil pressure
is
below
0.1
~0.3
kg/cm
2
(1.42~
4.26 lb/in.'), with the main switch
in
the ON position, the
contacts of the
oil
pressure switch are closed by a spring.
and the lamp
is
illuminated through the lamp
_.
oil pres·
sure
switch_.
ground circuit system.
If
the
oil
pressure
is
normal, the swltc contacts are opened by the lubricating
oil pressure and the lamp remains off.
Main
switch
l_
:
Battery
_]_
(Oil
pressure
aiarm
circuit)
Oil
pressure
Oil
pressure
switch
Inspection
Problem
Lamp not illuminated when
main switch set to ON
Lamp not extinguished
while engine running
Contacts
Oil
pressure
.......
Inspection Item
1. Oil pressure tamp
blown out
2.
Operation of oil pressure
switch
1 . Oil level low
2.
Oil pressure low
3.
Oil pressure faulty
4.
Wiring between lamp and oil
pressure switch faulty
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Q .
Lubeoll A
pressure--r:;::i
switch
Cylinder
body
main
gallery
Rated voltage
Operation pressure
Lamp capacity
Inspection method
( 1) Visual inspection
(2) Lamp not illuminated even
when main switch set to ON
position and terminals of oil
pressure switch grounded
Lamp illuminated when checked
as described in (2) above
Stop engine and check oil
level
with
dipstick
Measure oil pressure
Switch faulty if abnormal at (1)
and (2) above
Cut the wiring between the
lamp and switch and wire with
separate wire
9-42
.
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O·_/
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_·P----
•
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•
'
C
'-.;
,\
·Y.'@r
12V
0.1
~0.3kg/cm'
5W
Corrective action
Replace iamp
Replace oil pressure switch
Add oil
Repair bearing wear and
adjust regulator valve
Replace oil pressure switch
Repair wiring harness
Printed
in Japan
HINSHI-H8009
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