Yanmar 6LY3 series Service Manual page 298

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