Troubleshooting By Symptom - Yanmar 6LY3 series Service Manual

Troubleshooting by Symptom

12/05
TROUBLESHOOTING BY SYMPTOM
It is important to thoroughly understand each system and the function of all parts in these systems. A careful
study of the engine mechanisms will make this possible. When problems arise, it is important to carefully
observe and analyze the indications of trouble in order to save time in determining their cause. Begin by
checking the most easily identifiable causes of difficulty. Where the cause of the difficulty is not readily
apparent, make a thorough examination of the system from the easiest, proceeding until the cause of the
trouble can be determined. While experience is an important factor in pinpointing engine problems, careful
study and understanding of the engine mechanisms, combined with good common sense, will help you
rapidly become an expert at troubleshooting.
Trouble Symptom
No power to the digital display
and the control head.
6LY3 Service Manual
Causes
Low battery voltage / no battery
voltage.
Battery will not charge.
Control system wiring is
disconnected.
Connectors are not closed.
Contact failure of each
connector pin.
Fuse burned out.
(AUX POWER: 10A)
Contrast control is too low
© 2007 Yanmar Marine International
Corrective Action
Check the electrolyte level and
the specific gravity of the
battery liquid.
Charge the battery or replace.
Check the wiring circuit.
Check the wires between the
alternator and the battery.
Check the tension of the V-belt. See Inspecting the Alternator
Check the alternator.
Connect the control system
wires.
Close the connectors
according to the manual.
Check each connector pin and
confirm the continuity.
Replace the fuse.
Adjust the contrast.
TROUBLESHOOTING
Remarks
See Checking the Electrolyte
Level on page 12-4.
See Charging the Battery on
page 12-5.
See Alternator Wiring Diagram
on page 11-8.
See Alternator Wiring Diagram
on page 11-8.
on page 11-9.
See Alternator on page 11-1.
See Alternator Wiring Diagram
on page 11-8.
See Remote Control Electronic
Control System (ECS) on
page 12-20.
See Remote Control Electronic
Control System (ECS) on
page 12-20.
See Troubleshooting Fuses,
Relays and Harnesses on
page 13-21.
See Digital Display Operation
Manual.
13-5