Oil System Troubleshooting; Low Oil Warning System Is Activated - Mercury 150 EFI Service Manual

Oil System Troubleshooting

Low Oil Warning System is Activated

Problem
Low oil level in engine
oil reservoir but not low
in remote oil tank
Note: Oil level in engine
oil reservoir should be
up to the fill cap
Air was never purged from
engine oil tank
Fill cap is leaking air on re-
mote tank
Remote oil hoses blocked or
punctured
Restricted oil outlet filter in re-
mote oil tank
Restricted oil inlet filter in oil
hose before engine oil reser-
voir
Air leak in upper portion on
the oil pickup tube
Faulty pressure check valve.
Located in engine at end of
(black without blue stripe) re-
mote oil hose
No Continuity
Oil Float switch is faulty. Re-
place switch
90-883728 JULY 2001
Problem
Low oil level in en-
gine oil reservoir and
also remote oil tank
Refill both oil tanks.
Purge air from en-
gine oil tank. Refer
to procedure
Purge air from engine oil tank.
Refer to procedure
Caps on remote tank must be
sealed and installed tight
Check hoses for a kink or
leakage
Remove filter and clean
Replace oil filter
Replace tube
Replace check valve
No Continuity
Remove engine oil reservoir
cap and use wire to pull float
to top of travel
Float in oil tank is faulty. Re-
place oil tank
Problem
Oil level is not low
in either tank
Disconnect BLUE/
BLACK wires going
to the low oil float
switch in the engine
oil reservoir. Check
switch for continuity
Continuity
Check for open wire between
oil float switch and ECM
Continuity
OIL INJECTION
Problem
Oil leaks out of
exhaust
or #6 cylinder
Pulse hose and
oil supply hose
are reversed
Boat oil tank is
mounted higher
than pulse hose
fitting on engine
and oil tank is
over-filled
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