Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 68Get this manual
IGNITION
Spark Cut-Out
6250 6281 6313
6Over Heat Protection: Limits engine RPM to 2000 if the engine temperature exceeds 192.2 (89 C)The ECM will sound the over heat warning horn (a continuous tone) and turn on the optional Over Heat Warning lampOver heat warning will subside if the engine temperature drops below 183.20 (84 C) and engine RPM is momentarily dropped below 1000 RPM as reset conditionThe ECM incorporates 20 second warning system delay to compensate for warm restart (heat soak) condition 7Low Oil Pressure Protection: Limits the engine RPM to 2000 if oil pressure drops below 2.25 +- 0.75 psiTh ECM will sound the low oil pressure warni ng horn (intermittent second onsecond off) and tu rn on the optional Low Oil Pressure Warning lampLow oil pressure warning will reset by shutting th engine off and restarting at normal oil pressureThe ECM incorporates 10 second warning system delay to allow engine to achieve operating oil pressureNOTE: The ECM controls all timing operationsThere are no timing adjustment required on this engine