(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.
T-33