Low Oil Pressure; Engine Overspeed Limiter; Warning Light And Warning Horn Wire Diagrams; Warning Light Wire Diagram - Mercury 25 EFI Service Manual

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Low Oil Pressure

The warning system will be activated if the oil pressure drops too low. First, stop the engine and check the oil level. Add oil if

necessary. If the oil is at the recommended level and the warning horn continues to sound, consult your dealer. Engine speed

will be limited to 2800 RPM, however, you should not continue to run engine.

Some causes of engine overspeed are as follows:

Propeller ventilation

A propeller which has an incorrect pitch or diameter

Propeller hub slippage

Outboard mounted too high on the transom

Tilting the outboard out beyond a vertical position

Cavitation of the propeller due to rough water or obstruction in the boat hull

When the engine overspeed limiter is activated, the engine timing will be momentarily retarded to decrease the engine speed.

Excessive overspeed (above 6300 RPM) will result in cutout of the cylinders to prevent operation above this limit.

90-8M0105568 eng MARCH 2016

ECM engine harness

Warning light

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