Range Rover County LWB (LH) V8-4.2L (1993)
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Oil Pressure Warning Lamp/Indicator: Description and Operation
Low Engine Oil Level/Pressure Warning Light
The low engine oil level/pressure warning light warning light receives battery voltage with the Ignition Switch (X134) in position II. If the engine oil
pressure is very low, the Oil Pressure Switch (X149) will apply ground to the warning light. The oil level detection system consists of an Engine Oil
Level Sensor (X148) and Engine Oil Level Monitor Unit (Z127). When the Ignition Switch (X134) is initially put in position II, battery voltage is
applied to the monitor unit. The monitor unit then sends a voltage signal to the Engine Oil Level Sensor (X148) and looks for a return of that voltage
signal. If the signal is not returned, the Engine Oil Level Monitor Unit (Z127) flashes the low engine oil level/pressure warning light for 10 to 20
seconds by applying a pulsing ground signal to the warning light. If the ignition is switched to position II after being at position 0 for less that 15 to 30
seconds. the Engine Oil Level Monitor Unit (Z127) will ignore the Engine Oil Level Sensor (X148) and not flash the warning light even if the oil level is
low.
