Oil Pressure Switch - Subaru 2002 Impreza Service Manual

OIL PRESSURE SWITCH
Lubrication
6. Oil Pressure Switch
The oil pressure switch is located in the front upper portion of the right cylinder block bank. The
purpose of this switch is to monitor the operation of the oil pump as well as the lubricating oil pres-
sure when the engine is running.
(1) Contact point
(2) Diaphragm
(3) Spring
r .
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(4) Molded portion
(5) Terminal
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1) When oil pressure does not build up (immediately after ignition switch is turned ON):
The diaphra-gm is pushed toward the cylinder block by the spring force (a force equivalent to the
specified oil pressure). This closes the contact points, causing the oil pressure warning light in the
combination meter to illuminate.
2) When oil pressure reaches the specified value (after engine starts):
After reaching the specified value of 14.7 kPa (0.15 kgf/cm2, 2.1 psi), the oil pressure pushes the
diaphragm overcoming the spring force. This opens the contact points and the oil pressure warn-
ing light goes out.
LU-11