Specifications

ELECTRICAL SYSTEMS

OIL SHUTDOWN SWITCH

TO IGNITION

TO LOW OIL

SENSOR

GREEN

IDENTIFICATION

MARK

Switches, Sensors and

Solenoids

Low Oil Shutdown Switches

Check the L.O.S. switch while it is in the engine. The

engine must be level, and the oil level at the full mark.

Place the speed control in the run position. Remove

the spark plug wire from the spark plug. Install a gap

type tester connected to the spark plug wire and a good

engine ground. Spin the engine over using the electric

or recoil starter. A bright blue spark should be seen

at the tester. If not, remove the blower housing and

disconnect the L.O.S. lead from the ignition module.

Reinstall the blower housing and spin the engine over.

If spark occurs now, replace the L.O.S. switch. If no

spark is seen, replace the ignition module (diag. 81).

Low Oil Shutdown Indicator Light

If equipped, the indicator light will ﬂash if the oil level

is at or below the add mark when the engine is turned

over while attempting to start. Test by turning the

engine over with the oil level below the add mark. If the

indicator light does not ﬂash, replace the indicator light

(diag. 82).

Low Oil Pressure Sensor

Test the sensor on a running engine using an ohmmeter

or continuity tester with one test lead connected to the

sensor terminal and the other to an engine ground. An

open circuit should be found with the engine running

and continuity should exist when the engine is shut off.

If continuity is found or the oil pressure indicator is on

at low engine R.P.M.'s, remove the sensor and install

a master oil pressure gauge. The oil pressure of a

running engine should be 7 p.s.i. (.500 bar) or higher, if

lower an internal engine problem exists (diag. 83).

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