TROUBLESHOOTING
Troubleshooting by Symptom
13-8
6LY3 Service Manual
© 2007 Yanmar Marine International
Note: Starter relay operation on YDT
• Check the “Diagnostic Test Digital-Out”
• Check the “Manual”
• Enter the Password
• Enter the Engine Starter Inter Lock RL ON / OFF
Trouble symptom
Causes
Corrective action
Remarks
The starting motor does not rotate
and the engine cannot start.
Starter relay contact failure.
Check the operation of the
starter relay with a YDT or
equivalent service tool and a
tester. If there is a
malfunction, replace it.
See Troubleshooting Fuses,
Relays and Harnesses on
page 13-21
.
The pinion gear of the starter
does not mesh.
Magnet-switch terminal is
loose.
Check the magnet-switch
terminal. If a malfunction is
found, repair or replace.
See Troubleshooting Fuses,
Relays and Harnesses on
page 13-21
.
Magnet-switch contact
failure.
Coil failure.
Burr on the tooth.
Repair or replace.
See Battery Cables on
page 12-3
.
Clearance between the
pinion and the ring gear.
Repair the clearance.
See Battery Cables on
page 12-3
.
The pinion gear meshes but
the starting motor does not
rotate.
Loose battery or loose
starting motor terminals.
Check the terminals. If
trouble is found, repair.
See Battery Cables on
page 12-3
.
Starter coil failure.
Replace or repair.
See Starter on page 10-1
.
The clutch slips.
Replace or repair.
See Starter Components on
page 10-6
.
Battery cable resistance is
too high. (The wire diameter
is thin.)
Replace with the proper
cable.
See Battery Cables on
page 12-3
.
The battery voltage is too low
(battery discharge).
Check the electrolyte level
and the specific gravity.
See Checking the Electrolyte
Level on page 12-4
.
Charge the battery or
replace.
See Charging the Battery on
page 12-5
.
Check the electric circuit
wiring.
See Alternator Wiring
Diagram on page 11-8
.