Mercury V6 175 Diagnostic Manual page 46

General Troubleshooting
Audio Warning System
IMPORTANT: The audio warning system alerts the operator that a problem has occurred. It does not protect the engine from
damage.
Most faults cause the warning horn circuit to activate. How the warning horn activates depends upon the severity of the
problem.
There are two warning horn states:
• Caution
• Critical
There is also an alarm that sounds if the helm has not been properly configured using the G3 service tool.
Caution
If a caution state is detected, the audio warning system will sound for six one‑second intervals.
ON ON
1
a
1
OFF
Critical
If a critical state is detected, the audio warning system sounds for six seconds and then turns off.
ON
a
6
Nonconfigured Alarm
If the helm has not been properly configured using the G3 service tool, the audio warning system will sound for five one‑second
intervals.
ON ON
1 1
a
1
OFF
Testing the Audio Warning System
1. Turn the key 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.
IMPORTANT: Horn strategy is dependent upon software and calibration levels.
Troubleshooting MFD Faults
The table across the following pages does three things:
1. It lists all of the faults visible to the boat operator on a Mercury‑approved multifunction display (MFD). The information in
the first, third, and fourth columns (Short Text, Action, and Long Text, respectively) correspond directly to what the
operator sees on the screen. The second column describes the type of warning horn (refer to Audio Warning System,
preceding) that accompanies each MFD fault.
NOTE: Text shown in the first, third, and fourth columns is verbatim from the MFD.
NOTE: The Mercury universal fault code (UFC) is also visible to the boat operator on the MFD or on certain SmartCraft
gauges. The UFC contains two parts: 1) a three or four digit fault code and 2) a one or two digit failure code. These two
codes are listed in the following table in the two columns under the UFC heading. For a list of faults sorted by UFC, refer to
‑ Fault Codes .
Section 4A
Page 3A-2
ON ON
1 1 1
1 1 1
OFF OFF OFF
b
OFF
b
53403
ON ON ON
1 1 1
1 1 1
OFF OFF OFF
b
© 2018 Mercury Marine
ON ON
a - Horn (on or off)
1 1
b - Time (in seconds)
1
OFF OFF
33402
a - Horn (on or off)
b - Time (in seconds)
a - Horn (on or off)
b - Time (in seconds)
OFF
53402
90-8M0146617 eng JULY 2018