Operation; Instrumentation; Warning System - Mercury 540 Bravo Manual

Instrumentation

Mercury Racing requires that the following critical engine functions be
monitored:
• Oil pressure
• Engine RPM
• Water temperature
• System voltage
• Guardian fault messages
The use of SmartCraft instrumentation will display all of the above critical
engine functions as well as others not listed. SmartCraft instrumentation
will also display information about power train sensor faults and
Guardian activation.

Warning System

The engine's warning system includes an audible alert consisting of a horn
located in the helm harness, and the Engine Guardian system. Do not attempt
to alter or disable the warning system in any way.
ENGINE GUARDIAN SYSTEM
The Engine Guardian system monitors sensors on the engine for early
indications of problems. If a sensor indicates a fault, the system responds to
the problem by sounding the horn and, depending on the type of fault, may
reduce engine power to provide engine protection. Refer to the VesselView
manual to display the details. When the key switch is turned "ON," the warning
horn beeps once to verify horn operation.
Fault Type and Related Warning Signal
If there are two stages for a warning fault, Stage 1 occurs first. If a fault remains
active, Stage 2 becomes active. If multiple faults are active, the operator is
warned of the more severe fault first. If another fault with the same severity
occurs during Stage 2, the horn will return to Stage 1 signaling. Monitor the
VesselView for warning messages.
• Caution: 1 second on and 1 second off for 6 cycles
• OBD‑M Stage 1: 5 seconds on 1 cycle followed by 60 seconds off.
• OBD‑M Stage 2: 0.5 seconds on and 0.5 seconds off for 1 cycle followed
by 60 seconds off.
• Severe Stage 1: 6 seconds on and 6 seconds off for 2 cycles followed by
59 seconds off.
• Severe Stage 2: 0.5 seconds on and 0.5 seconds off for 2 cycles followed
by 59 seconds off.
• To stop the warning horn, turn off the engine. If the horn continues to
sound on restart, the system detected a fault again. See your Mercury
Marine dealer to correct the problem as soon as possible.

OPERATION

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