System Description

SYSTEM DIAGRAM

Courtesy of NISSAN NORTH AMERICA, INC.

Components	Function
Engine oil pressure sensor	Engine Oil Pressure Sensor
Crankshaft position sensor 1	Crankshaft Position Sensor 1
Engine oil temperature sensor	Engine Oil Temperature Sensor
ECM	ECM (With Barometric Pressure Sensor)
Combination meter	It receives the engine oil pressure waning lamp signal from ECM via CAN communication.

SYSTEM DESCRIPTION

The engine protection control at low engine oil pressure warns the driver of a decrease in engine oil pressure by the oil pressure warning lamp before the engine becomes damaged.
When detecting a decrease in engine oil pressure at an engine speed less than 1, 000 RPM, ECM transmits an oil pressure warning lamp signal to the combination meter. The combination meter turns ON the oil pressure warning lamp, according to the signal.
When detecting a decrease in engine oil pressure at an engine speed 1, 000 RPM or more, ECM transmits an oil pressure warning lamp signal to the combination meter. The combination meter turns ON the oil pressure warning lamp, according to the signals. When detecting a decrease in engine oil pressure, ECM cuts fuel if the engine speed exceeds the specified value.

Decrease in engine oil pressure	Engine speed	Combination meter	Fuel cut
Decrease in engine oil pressure	Engine speed	Oil pressure warning lamp	Fuel cut
Detection	Less than 1, 000 RPM	ON *	NO
Detection	1, 000 RPM or more	ON	YES

*: When detecting a normal engine oil pressure, ECM turns OFF the oil pressure warning lamp.