Section 2 - Getting to Know Your Power Package
Page 30
90-8M0061999
eng
MAY 2012
Caution
If a caution state is detected, the audio warning system will sound for six one‑second intervals.
a -
Horn (on or off)
b -
Time (in seconds)
Below are some examples of a caution state:
•
Drive oil is low (sterndrive models only)
•
Sensor failure
Severe
IMPORTANT: Operators are advised to contact an authorized Mercury MerCruiser dealer if a severe fault is activated.
If a severe state is detected, the audio warning system sounds for six seconds, turns off for six seconds, and sounds for six
more seconds. Then the audio warning system sounds for two half‑second intervals every sixty seconds.
a -
Horn (on or off)
b -
Time (in seconds)
Below are some examples of a severe state:
•
Transmission fluid temperature is too hot (inboard models only)
•
Engine oil pressure is too low
•
Engine temperature is too hot
•
Seawater pressure is too low
•
Transmission pressure is low (inboard models only)
Testing the Audio Warning System
1. Turn the ignition switch to the on position without cranking the engine.
2. Listen for the audio alarm. The alarm will sound if the system is functioning correctly.
Engine Guardian Strategy
Engine Guardian reduces the potential for engine damage by restricting engine power when the PCM detects a potential
problem. Engine Guardian monitors the following:
•
Oil pressure
•
Coolant temperature
•
Seawater pressure
•
Engine overspeed
•
Exhaust manifold temperature
The Guardian strategy also reduces power to 90% of maximum if any sensor on the power package fails. The PCM stores the
fault for diagnostics.
For example, if the water inlet becomes partially blocked, Guardian reduces the available power level of the engine to help
prevent damage from decreased water flow to the engine. If the debris passes through, and full water flow is restored, Guardian
restores engine power to normal.
Transmission Guardian Strategy
IMPORTANT: Boat speed could be reduced to idle and may not respond to the throttle.
ON
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
1
1
1
1
1
1
1
1
1
1
1
OFF
33402
a
b
40388
a
b
ON
ON
6
6
6
OFF
OFF
60
½
ON
½
ON
OFF
60
½
ON
½
ON