Troubleshooting Blown Fuses - Yanmar 6LY3 series Service Manual

TROUBLESHOOTING

Troubleshooting Blown Fuses

Blown fuses, their respective circuits and corrective action are shown in the following table. If the fuse blows
again, replace the corresponding wire harness.
No. Size Application
1 10A AUX POWER
2 10A IGN PANEL
(Switch panel)
3 20A ECU
4 10A IGN. SIG
(Switch ON
signal)
5 5A YDT
13-22
Trouble Symptom
Engine Stop Engine Running
The engine can Error (P0120 / 0) is
start. Error detected. The digital
(P0120 / 0) is display is not turned
detected. The digital on.
display will not turn
on.
The engine will not The engine will shut
start. ECU will not down. The engine
turn on. cannot start.
The engine will not The engine shuts
start. ECU will not down. The engine
turn on. cannot start.
The engine starts. Error (U0146) is
Error (U0146) is detected.
detected.
Engine runs normal Engine runs normal.
but the YDT is
inoperative.
© 2007 Yanmar Marine International
Troubleshooting Fuses, Relays and Harnesses
Key
Switch
Off Check the continuity between the negative
(-) side of the fuse and ground (engine
body). In case of continuity, the engine
harness may have a short circuit. Replace
it. (See Wire Harness Locations on
page 12-18.) In case of no continuity,
replace the fuse. If the fuse burns out again,
replace the harness.
Off Check the continuity between the negative
(-) side of the fuse and ground. (See Wire
Harness Locations on page 12-18.) In case
of continuity, replace the fuse. In case of no
continuity, the engine harness may have a
short circuit. Remove the harness 12-pin
connector above the fuel injection pump
and check for continuity again. (See Wire
Harness Locations on page 12-18.) In case
of continuity, the engine harness has a
short circuit. Replace it. In case of no
continuity, the TELEFLEX harness may
have a short circuit. Replace it.
— Replace the engine harness. (See Wire
Harness Locations on page 12-18.)
On Check the continuity between the negative
(-) side of the fuse and ground. (See Wire
Harness Locations on page 12-18.) In case
of continuity, engine harness may have a
short circuit. Replace it. (See Wire Harness
Locations on page 12-18.) In case of no
continuity, replace the fuse. If the fuse
burns out again, main harness may have a
short circuit. Replace it.
On Check the continuity between the negative
(-) side of the fuse and ground. (See Wire
Harness Locations on page 12-18.) In case
of continuity, engine harness may have a
short circuit. Replace it. (See Wire Harness
Locations on page 12-18.) In case of no
continuity, replace the fuse. If the fuse
burns out again, main harness may have a
short circuit. Replace it.
6LY3 Service Manual
Corrective Action