Yamaha 115 C Service Manual

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EMN00010
Chapter 5
TROUBLE RECOVERY
TROUBLESHOOTING..............................5-1
TEMPORARY ACTION 
IN EMERGENCY.......................................5-5
Impact damage .....................................5-5
Power trim / tilt will not operate .........5-5
Starter will not operate ........................5-6
Engine fails to operate .........................5-8
Low oil level warning activates...........5-9
Top cowling does not unlock ............5-10
Treatment of submerged motor .......5-11
1
2
3
4
5
6
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EMU01204¯
TROUBLESHOOTING
A problem in the fuel, compression, or ignition systems can cause poor starting, loss of
power, or other problems. The troubleshooting chart describes basic checks and possi-
ble remedies. (This chart covers all Yamaha outboard motors. Therefore, some items
may not apply to your model.)
If your outboard motor requires repair, bring it to a Yamaha dealer.
A. Starter will not
operate.Trouble Possible Cause Remedy
1. Battery capacity weak or low.
2. Battery connections loose or
corroded.
3. Fuse for electric start circuit blown.
4. Starter components faulty.
5. Shift lever in gear.1. Check battery condition. Use
battery of recommended capacity.
2. Tighten battery cables and clean
battery terminals.
3. Check for cause of electric
overload and repair. Replace fuse
with one of correct amperage.
4. Have serviced by a Yamaha
dealer.
5. Shift to neutral.
B. Engine will not
start (Starter
operates).1. Fuel tank empty.
2. Fuel contaminated or stale.
3. Fuel filter clogged.
4. Starting procedure incorrect.
5. Fuel pump malfunctions.
6. Spark plug(s) fouled or incorrect
type.
7. Spark plug cap(s) fitted incorrectly.
8. Poor connections or damaged
ignition wiring.
9. Ignition parts faulty.
10. Engine stop switch lanyard not
attached.
11. Engine inner parts damaged.1. Fill tank with clean, fresh fuel.
2. Fill tank with clean, fresh fuel.
3. Clean or replace filter.
4. Read STARTING ENGINE
section.
5. Have serviced by a Yamaha
dealer.
6. Inspect spark plug(s). Clean or
replace with recommended type.
7. Check and re-fit cap(s).
8. Check wires for wear or breaks.
Tighten all loose connections.
Replace worn or broken wires.
9. Have serviced by a Yamaha
dealer.
10. Attach lanyard.
11. Have serviced by a Yamaha
dealer.
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C. Engine idles
irregularly or stalls.Trouble Possible Cause Remedy
1. Spark plug(s) fouled or incorrect
type.
2. Fuel system obstructed.
3. Fuel contaminated or stale.
4. Fuel filter clogged.
5. Failed ignition parts.
6. Warning system activated.
7. Spark plug gap incorrect.
8. Poor connections or damaged
ignition wiring.
9. Specified engine oil not used.
10. Thermostat faulty or clogged.
11. Carburetor adjustments incorrect.
12. Fuel pump damaged.
13. Air vent screw on the fuel tank
closed.
14. Choke knob pulled out.
15. Motor angle too high.
16. Carburetor clogged.
17. Fuel joint connection incorrect.
18. Throttle valve adjustment incorrect.
19. Battery lead disconnected.1. Inspect spark plug(s). Clean or
replace with recommended type.
2. Check for pinched or kinked fuel
line or other obstructions in fuel
system.
3. Fill tank with clean, fresh fuel.
4. Clean or replace filter.
5. Have serviced by a Yamaha
dealer.
6. Find and correct cause of warning.
7. Inspect and adjust as specified.
8. Check wires for wear or breaks.
Tighten all loose connections.
Replace worn or broken wires.
9. Check and replace oil as specified.
10. Have serviced by a Yamaha
dealer.
11. Have serviced by a Yamaha
dealer.
12. Have serviced by a Yamaha
dealer.
13. Open the air vent screw.
14. Return to home position.
15. Return to normal operating
position.
16. Have serviced by a Yamaha
dealer.
17. Connect correctly.
18. Have serviced by a Yamaha
dealer.
19. Connect securely.
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D. Warning buzzer
sounds or
indicator lamp
lights.Trouble Possible Cause Remedy
1. Cooling system clogged.
2. Engine oil level low.
3. Heat range of spark plug incorrect.
4. Specified engine oil not used.
5. Engine oil contaminated or
deteriorated.
6. Oil filter clogged.
7. Oil feed/injection pump
malfunctions.
8. Load on boat improperly distributed.
9. Water pump/thermostat faulty.
10. Excess water in fuel filter cup.1. Check water intake for restriction.
2. Fill oil tank with specified engine
oil.
3. Inspect spark plug and replace it
with recommended type.
4. Check and replace oil with
specified type.
5. Replace oil with fresh, specified
type.
6. Have serviced by a Yamaha
dealer.
7. Have serviced by a Yamaha
dealer.
8. Distribute load to place boat on an
even plane.
9. Have serviced by a Yamaha
dealer.
10. Drain filter cup.
1. Propeller damaged.
2. Propeller pitch or diameter incorrect.
3. Trim angle incorrect.
4. Motor mounted at incorrect height
on transom.
5. Warning system activated.
6. Boat bottom fouled with marine
growth.
7. Spark plug(s) fouled or incorrect
type.
8. Weeds or other foreign matter
tangled on gear housing.
9. Fuel system obstructed.
10. Fuel filter clogged.
11. Fuel contaminated or stale.
12. Spark plug gap incorrect.1. Have propeller repaired or
replaced.
2. Install correct propeller to operate
outboard at its recommended
speed (r/min) range.
3. Adjust trim angle to achieve most
efficient operation.
4. Have motor adjusted to proper
transom height.
5. Find and correct cause of warning.
6. Clean boat bottom.
7. Inspect spark plug(s). Clean or
replace with recommended type.
8. Remove foreign matter and clean
lower unit.
9. Check for pinched or kinked fuel
line or other obstructions in fuel
system.
10. Clean or replace filter.
11. Fill tank with clean, fresh fuel.
12. Inspect and adjust as specified. E. Engine power loss.
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Trouble Possible Cause Remedy
13. Poor connections or damaged
ignition wiring.
14. Failed ignition parts.
15. Specified engine oil not used.
16. Thermostat faulty or clogged.
17. Air vent screw closed.
18. Fuel pump damaged.
19. Fuel joint connection incorrect.
20. Heat range of spark plug incorrect.13. Check wires for wear or breaks.
Tighten all loose connections.
Replace worn or broken wires.
14. Have serviced by a Yamaha
dealer.
15. Check and replace oil with
specified type.
16. Have serviced by a Yamaha
dealer.
17. Open the air vent screw.
18. Have serviced by a Yamaha
dealer.
19. Connect correctly.
20. Inspect spark plug and replace it
with recommended type. E. Engine power loss.
F. Engine vibrates
excessively.1. Propeller damaged.
2. Propeller shaft damaged.
3. Weeds or other foreign matter
tangled on propeller.
4. Motor mounting bolt loose.
5. Steering pivot loose or damaged.1. Have propeller repaired or
replaced.
2. Have serviced by a Yamaha
dealer.
3. Remove and clean propeller.
4. Tighten bolt.
5. Tighten or have serviced by a
Yamaha dealer.
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EMN20010
TEMPORARY ACTION IN
EMERGENCY
EMU01492
IMPACT DAMAGE
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The outboard motor can be seriously
damaged by a collision while operating
or trailering. Damage could make the out-
board motor unsafe to operate.
If the outboard motor hits any object in
the water, follow the procedure below.
1) Stop the engine immediately.
2) Inspect the control system and all
components for damage. Also,
inspect the boat for damage.
3) Whether damage is found or not,
return to the nearest harbor slowly
and carefully.
4) Have a Yamaha dealer inspect the
outboard motor before operating it
again.
EMG65210
POWER TRIM / TILT WILL NOT
OPERATE
If the engine cannot be tilted up or down
with the power trim and tilt because of a
discharged battery or a failure with the
power trim and tilt unit, the engine can be
tilted manually.
1Manual valve screw
EMG65111
1) Loosen the manual valve screw coun-
terclockwise until it stops.
2) Put the engine in the desired position,
then tighten the manual valve screw
clockwise.
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607011
411025
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EMN30210
STARTER WILL NOT OPERATE
If the starter mechanism does not operate
(engine cannot be cranked with the starter),
the engine can be started with an emer-
gency starter rope.
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8Use this procedure only in an emer-
gency and only to return to port for
repairs.
8When the emergency starter rope is
used to start the engine, the start-in-
gear protection device does not oper-
ate. Make sure the transmission is in
neutral. Otherwise, the boat could
unexpectedly start to move, which
could result in an accident.
8Be sure no one is standing behind you
when pulling the starter rope. It could
whip behind you and injure someone.
8An unguarded rotating flywheel is very
dangerous. Keep loose clothing and
other objects away when starting the
engine. Use the emergency starter
rope only as instructed. Do not touch
the flywheel or other moving parts
when the engine is running. Do not
install the starter mechanism or top
cowling after the engine is running.
8Do not touch the ignition coil, high
voltage wire, spark plug cap or other
electrical components when starting of
operating the motor. You could be
shocked.
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Procedure
1) Remove the top cowling.
2) Remove the flywheel cover by removing
the bolts.
3) Prepare the engine for starting. See
STARTING ENGINE for procedures. Be
sure the engine is in Neutral and that
the lanyard is attached to the engine
stop switch. The main switch must be
on.
NOTE:
8In this case, choke switch will not oper-
ate. Pull out the choke knob when engine
is cold.
8Without setting the main switch to ON, it
is impossible to start the engine.
4) To start the engine with the emergency
starter rope, insert the knotted end of
the rope into the notch in the flywheel
rotor and wind the rope several turns
clockwise. Then, give a strong pull
straight out to crank the engine. Repeat
if necessary.
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Do not install the top cowling when
engine is running.
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208036
ON
START OFF
701026
208041
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EMN32110
ENGINE FAILS TO OPERATE
If battery voltage is low or in the unlikely
event of an ignition system malfunction, the
engine speed may become erratic or the
engine may stop. In such a case, discon-
nect the connection on the yellow cord
(emergency circuit) to return to port.
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When the connection is disconnected,
the idling and low speeds are slightly
higher than normal. Use care when start-
ing off or stopping.
1CDI unit
2Yellow cord
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Follow this procedure only in an emer-
gency and just long enough to return to
port for repairs.
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220013*
216013
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218011*
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218012*
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EMU19930
LOW OIL LEVEL WARNING
ACTIVATES
If the oil level is allowed to drop too low,
the red segment will appear on the oil
level indicator, the buzzer will sound, and
engine speed will be limited to about
2,000 r/min. If this happens, a reserve
amount of oil can be pumped from the
remote oil tank 3to the engine oil tank 2
using the emergency switch 1.
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Be sure to stop the engine before per-
forming this procedure.
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8If the emergency switch is held up too
long, too much oil will be pumped into
the engine tank, overflowing it. Release
the switch when oil reaches the upper
level line on the engine oil tank.
8Do not use this emergency procedure
unless the oil level warning lamps are
installed and working.
1) Remove the top cowling.
2) Turn the main switch to the “ON”
position.
3) Lift the emergency switch to pump
reserve oil in remote oil tank into the
engine oil tank.
4) After using the emergency switch,
turn off the main switch, then turn it
back on. This resets the warning sys-
tem to normal operation. The yellow
segment will continue to be displayed
on the oil level indicator.
5) Start the engine and return to the
nearest port for more oil.
V4
V6
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