Subaru ER12 - 7-2 Oil Sensor

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7-2 OIL SENSOR
The oil sensor system is composed of the oil pressure switch and CPU (Central Processing Unit) inside of
the Ignition coil In accordance with the oil level which means oil pressure, the pressure switch functions
“ON” and “OFF” The type of pressure switch is normally closed “ON” type
Switching pressure: 0.10 through 0.20 kg/cm
2
(10 through 20KPa)
While there is no pressure (No oil, or Low level), the diaphragm is pressed by the spring force, resulting
the contact closes “ON”
When oil pressure increases, the diaphragm is pressed by the oil pressure which is bigger than the spring
force, resulting the contact opens “OFF”
INSPECTION
Measure resistance between the terminal and the pressure switch body
“ON” close the contact: 0 ohm (continuity) while engine stopped
“OFF” open the contact: ∞ (No continuity) during engine running
The switch structure is complicated, so if its function cannot be recovered even after cleaning, replace the
switch with new one
Apply sealant (Three Bond 1215) to the thread on the pressure switch when re-assembling