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PH3300i SM, Rev. 2017-01-20
4.5.1 Checking the Low Oil Sensor
This generator is equipped with a low oil sensor that shuts down the engine when the oil reaches
critical levels, to prevent engine failure. The low oil sensor is mounted inside the crankcase of the
engine. If the oil sensor needs to be replaced, the crankcase will need to be opened. Refer to
(section 5.7) for engine removal and (section 5.12) for opening the crankcase.
1. Remove the maintenance door and locate the oil sensor lead which is strapped to the battery
wire harness below the in-line fuse between the battery and the air cleaner (Fig. 22).
2. Disconnect the low oil sensor while the engine is running (Fig. 23).
3. Ground the white wire from the regulator connector to the engine block, to verify that the
engine stops and the low oil light on the control panel illuminates. If the engine fails to stop, or
the low oil light fails to illuminate, refer to the flow chart in (section 4.5) to diagnose the
problem.
4. After confirming that the engine oil is at the proper level, test for continuity between the white
wire of oil sensor connector and the case of the engine (Fig. 24). No continuity indicates a
normal condition.
If there is any continuity at all, replace the oil sensor.
5. Continuity (.1
–1.0Ω) between the white oil sensor lead and engine when the oil is drained
from the engine indicates a normal condition. If there is high resistance, or no continuity
replace the oil sensor
Failure to replace a faulty oil level sensor can lead to permanent engine damage
or destruction if the engine runs low of oil.
Low Oil Sensor
Lead Behind
In-line Fuse
Fig. 22
White Connector
to the Regulator
White Connector
to the Low Oil
Sensor
Fig. 23
Fig. 24
Check Continuity
between the White
Oil Sensor Wire and
Ground
