4 - OPERATION
28 90-8M0098854 MARCH 2015
INSTRUMENTATION
It is important to monitor critical engine and boat functions while the
boat is in operation.
Mercury Racing requires that the following critical engine functions
be monitored:
• Oil pressure
• Engine RPM
• Oil temperature
• Water temperature
• System voltage
• Guardian fault messages
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
any early indications of problems. If a sensor indicates a fault, the
system responds to the problem by emitting a sequence of horn
events 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 system's 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 fault with the most severity occurs first. If another fault
with the same severity occurs during Stage 2, the horn will return to
Stage 1. Monitor the VesselView for warning messages.
• Caution ‑ 1 second on and 1 second off for 6 cycles
• OBDM Stage 1–5 seconds on 1 cycle with a 60 second off
time
• OBDM Stage 2–0.5 seconds on and 0.5 seconds off for 1
cycle with a 60 second off time
• Severe Stage 1–6 seconds on and 6 seconds off for 2 cycles
with a 59 second off time
• Severe Stage 2–0.5 seconds on and 0.5 seconds off for 2
cycles with a 59 second off time
• To stop an activated horn warning, 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.
• If on restart the beeping stops, the problem does not need
immediate attention but will require you to see your authorized
Mercury Marine dealer to diagnose and clear the fault.
If the Propulsion Control Module (PCM) detects a fault signal from
an engine sensor, it records a fault code. A Computer Diagnostic
System (CDS) is required to extract specific problem codes from the
PCM.
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