Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 247Get this manual
dALERT SYSTEM These models are equipped with the alert systemThe CDI unit controls the engine speed when the low engine oil pressure or overheat is detected
Oil Alert System
When the oil pressure switch detects low oil pressure, the CDI unit receives the signal of low oil pressure and it gradually decreases the engine speed to 1,800 min-I (rpm)When the problem is removed, the CDI unit gradually increases the engine speed until the engine is restored to normal operation
Overheat Alert System
The ECT sensor mounted on the cylinder head transmits the electric signal of the engine temperature to the CDI unitWhen the CDI unit detects overheat, it gradually decreases the engine speed to 1,800 min.l (rpm)If the problem is not removed within 20 seconds, the CDI unit decreases the engine speed further until the engine stopsWhen the overheat problem is removed during this control, the CDI unit gradually increases the engine speed until the engine is restored to normal operation