(2)
Connect
the
diode-testing
light
to
high-pressure switch and
increase the engine speed
slowly.
When
the
oil
pressure
reaches
160-200KPa,
the
light-emitting diode should
be lighted. If it is not
lighted, then it indicates
that the high pressure
switch is faulty; further
increase the engine speed
up to 2000r/min, then the
oil pressure should reach at
least 200KPa. Otherwise it
indicates
that
the
lubricating
system
is
faulty.
Upon the above inspection,
if the lubricating system
and lubricating oil pressure
switch are both normal,
but the warning lamp
keeps on indicating that
the malfunction is still
present, and it should
inspect
the
circuit
malfunction according to
the circuit diagram.
Pay
attention
when
carrying
out
the
inspection:
for
low
pressure warning switch
circuit, the warning lamp
will be lighted when there
is a short circuit to ground,
so it should emphasize on
inspecting to see whether
there is any grounding;
while for high pressure
warning switch circuit, the
warning lamp will be
lighted when there is an
open circuit as well as
when the engine speed is
over 2000r/min, so it
should
emphasize
on
inspecting to see whether
there is any open circuit.