BMW 3 (E46). Manual — part 69
Oil pressure, checking
In some engines access to the oil
pressure warning switch port may be
extremely restricted.
-
Unscrew oil filter cap in order to
allow engine oil to drain back
down into oil pan.
Disconnect harness connector from oil
pressure switch (arrow) and remove
switch.
CAUTION!
Running the engine with the oil
pressure switch disconnected may
set a fault code (DTC).
Note:
Thoroughly clean around the oil
pressure switch before removing it.
Be prepared to catch leaking oil
with a shop towel.
Component location
Oil pressure
switch
base of oil filter
housing
-
Install pressure gauge in place of
switch.
-
With gauge installed, start engine
and allow to reach operating
temperature. Check oil pressure
both cold and hot.
Note:
For the most accurate test results, the
engine oil and filter should be new. The
oil should be the correct grade.
Oil pressure
Idle (minimum)
0.5 bar (7 psi)
Regulated
pressure (elevated
engine speed)
4.0 bar (59 psi)
-
Remove pressure gauge and
reinstall pressure switch.
Tightening torque
Oil pressure switch
to oil filter housing
27 Nm (20 ft-lb)
If testing shows low oil pressure, one or
more of the following conditions may
be indicated:
Worn or faulty oil pump
Worn or faulty engine bearings
Severe engine wear
All of these conditions indicate the
need for major repairs.
Oil pressure warning system,
testing
When the ignition is turned on, the oil
pressure warning light comes on.
When the engine is started and the oil
pressure rises slightly, the oil pressure
switch opens and the warning light
goes out. Make sure the oil level is
correct before making tests.
-
Turn ignition switch on.
Warning light on instrument panel
must light up.
-
Remove connector from oil
pressure switch.
Warning light on instrument panel
must go out.
CAUTION!
Running the engine with the oil
pressure switch disconnected may
set a fault code (DTC).
Note:
If the light does not go out, the wiring to
the switch is most likely grounded
somewhere between the switch terminal
and the warning light. See Electrical
Wiring Diagrams at rear of manual for
electrical schematics.
-
If warning light does not light
when ignition is on, remove
connector from oil pressure switch
and use a jumper wire to ground
connector terminal to a clean
metal surface.
Note:
If the warning light comes on, check the
switch as described in the next step. If
the warning light does not come on, the
wiring to the instrument cluster or to the
light itself is faulty.
-
To test switch, connect an
ohmmeter between terminal in
switch body and ground. With
engine off, there should be
continuity. With engine running,
oil pressure should open switch
and there should be no continuity.
Replace a faulty switch.
CAUTION!
Keep in mind that low oil pressure
may be preventing the switch from
turning the light out. If the light
remains on while the engine is
running, check the oil pressure as
described earlier. Do not drive the
car until the problem is corrected.
The engine may be severely
damaged.
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