
TROUBLESHOOTING
102 BY Series Operation Manual
TROUBLESHOOTING
INFORMATION
If your engine does not operate properly,
refer to the troubleshooting chart or see
your authorized Yanmar marine dealer or
distributor.
Supply the authorized Yanmar marine
dealer or distributor with the following
information:
• Model name and serial number of your
engine
• Boat name, hull material, size
• Use and type of boating
• Total number of operation hours (refer to
hourmeter), age of boat
• Operating conditions when the problem
occurred:
Engine rpm
Color of exhaust smoke
Type of diesel fuel
Type of engine oil
Any abnormal noises or vibration
• Operating environment such as high
altitude or extreme ambient
temperatures, etc.
• Engine maintenance history and
previous problems
• Other factors that contribute to the
problem
Diagnostic Trouble Codes
When certain faults occur, or when certain
limits have been exceeded, the engine
ECU may generate a “Check Engine”
warning or turn on a check engine light (if
equipped). Some of these faults may also
generate a DTC or Diagnostic Trouble
Code and an audible alarm. If a DTC is
generated, the engine ECU will store that
code or codes for reference. To read the
DTC codes, a special tool is used by the
technician. The technician then can use a
list to more quickly find the cause of the
fault and correct it.
Some conditions will produce an alarm but
do not generate a trouble code. An
example is engine overheat (over 108°C)
caused by an obstructed seawater inlet.
The overheat alarm will sound and the
engine torque will be reduced to protect
the engine, but no code will be set.
Under some conditions, the warning alarm
will sound until the fault code is checked
and corrected. Under other conditions, the
alarm will be canceled if the engine is
turned off and then restarted.
For further information, please contact
your nearest Yanmar distributor or dealer.
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