Yanmar 6LY3 series Service Manual page 307

Troubleshooting by Symptom
12/05
Trouble symptom
White exhaust smoke in cold weather.
Air heater does not work
well. See Air Heater on
page 13-81.
Improper fuel.
Faulty fuel injection nozzle.
6LY3 Service Manual
Causes
The battery voltage is low
(battery discharge).
The battery voltage is low
(faulty charging).
Loose or faulty connection
on the air heater terminal.
Loose or faulty connection
on the air heater relay
terminal.
Faulty air heater.
Faulty air heater relay.
Fuse burned out.
(Air heater A or B: 250A)
Coolant temperature sensor
error (P0115) is detected.
Low cetane number.
Excessive aromatics in the
fuel.
Faulty valve and / or seat.
Sticking needle valve.
Wear of seat.
Clogged fuel injection
hole(s).
Decrease in fuel opening
pressure.
© 2007 Yanmar Marine International
TROUBLESHOOTING
Corrective action
Check the electrolyte level
and the specific gravity.
Charge the battery or
replace.
Check the electric circuit.
Check the alternator and
battery terminals.
Check the V-belt tension.
Check the alternator
operation.
Check around the terminal
and repair if necessary.
Check around the terminal
and repair if necessary.
Disassemble and check.
Replace if necessary.
Check the relay with a YDT
and tester. Replace if
necessary.
Replace.
Replace the fuel.
Replace the fuel.
Check the fuel spray
condition with a tester. If a
malfunction is found, send it
to the FIE shop for service or
replacement.
Remarks
See Checking the Electrolyte
Level on page 12-4.
See Charging the Battery on
page 12-5.
See Fuse and Relay
Location on page 12-17.
See Inspecting the Battery
on page 12-4.
See Check the V-Belt
Tension on page 4-25.
See Alternator on page 11-1.
See Air Heater Operation on
page 12-13.
See Fuse, Relay and
Harness Components on
page 12-16.
See Air Heater Operation on
page 12-13.
See Fuse, Relay and
Harness Components on
page 12-16.
See Troubleshooting Fuses,
Relays and Harnesses on
page 13-21.
DTC: See Troubleshooting
by DTC Fault Codes on
page 13-28.
See Additional Fuel
Requirements on page 3-6.
See Additional Fuel
Requirements on page 3-6.
See Fuel Injection Nozzle
Components and Functions
on page 6-26.
13-17