Metro L3-61 1.0L (1990)
Oil Pressure Warning Lamp/Indicator: Description and Operation
Many cars utilize a warning light on the instrument panel in place of the conventional dash indicating gauge to warn the driver when the oil pressure is
dangerously low. The warning light is wired in series with the ignition switch and the engine unit, which is an oil pressure switch.
The oil pressure switch contains a diaphragm and a set of contacts. When the ignition switch is turned on, the warning light circuit is energized and the
circuit is completed through the closed contacts in the pressure switch. When the engine is started, build-up of oil pressure compresses the diaphragm,
opening the contacts, thereby breaking the circuit and putting out the light.
