2001 Mercury Mariner 50-60HP Factory Service Manual, Page 79Get this manual
IGNITION
RPM 6250 6281 6313
Spark Cut-Out 11 33 66
6Over Heat Protection: Limits engine RPM to 2000 if the engine temperature exceeds 179.6 (82 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 174.2 (79 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) condition7Low Oil Pressure Protection: Limits the engine RPM to 2000 if oil pressure drops below 2.25 + 0.75 psiThe ECM will sound the low oil pressure warning horn (intermittent second onsecond off) and turn on the optional Low Oil Pressure Warning lampLow oil pressure warning will reset by shutting the engine off and restarting at normal oil pressureThe ECM incorporates 10 second warning system delay to allow engine to achieve operating oil pressure