2005 YAMAHA VX110 check engine light

3-20
E
INSP
ADJ
POWER UNIT
Spark plug inspection
1. Remove:
Ignition coils
CAUTION:
Be careful not to get any foreign sub-
stances or water in spark plug hole.
2. Inspect:
Electrodes 1

Damage/wear →
Replace.
Insulator color 2

Distinctly different color →
Check the
engine condition.
Color guide:
Medium to light tan color:
Normal
Whitish color:
Lean fuel mixture
Air leak
Incorrect settings
Blackish color:
Overly rich mixture
Electrical malfunction
Defective spark plug
3. Clean:
Spark plug
(with a spark plug cleaner or wire brush)
4. Measure:
Spark plug gap a

Out of specification →
Regap.
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
ProCarManuals.com

7-11
E
–+ELECELECTRICAL ANALYSIS
Peak voltage adapter
NOTE:
Throughout this chapter the part numbers of
the specified peak voltage adapters have
been omitted. Refer to the following part
numbers.
The peak voltage adapter should be used
with a digital tester.
When measuring the peak voltage, connect
the peak voltage adapter to the digital circuit
tester and switch the selector to the DC volt-
age mode.
NOTE:
Make sure that the adapter leads are prop-
erly installed in the digital circuit tester.
Make sure that the positive pin (the “+” mark
facing up as shown) on the adapter is
installed into the positive terminal of the
tester.
The test harness is needed for the following
tests.
È Voltage measurement
É Peak voltage measurement
Test harness
NOTE:
If the lighting coil and pickup coil(s) are mea-
sured unloaded, disconnect the test harness
on the output side coupler.
Peak voltage adapter:
YU-39991
Peak voltage adapter B:
90890-03172
Checking steps:
Disconnect the coupler connections.
Connect the test harness between the
couplers.
Connect the tester terminals to the termi-
nals which are being checked.
Run the engine and observe the mea-
surement.È
É
ProCarManuals.com

7-56
E
–+ELECINDICATION SYSTEM
Overheat warning indicator
1. Check:
Overheat warning indicator
Does not come on → Replace the multi-
function meter.
Checking steps:
Start the engine.
Disconnect the thermoswitch (engine)
connector 1 (blue), engine temperature
sensor connector 2 (black), or ther-
moswitch (exhaust) 3 connector.
Connect the jumper lead to the female
terminal of the disconnected connector.
Check that the multifunction meter over-
heat warning indicator blinks, then comes
on. The buzzer also begins to sound
intermittently, then sounds continuously.
3
12
Check engine warning indicator
1. Check:
Check engine warning indicator
Does not come on → Replace the multi-
function meter.
Checking steps:
Start the engine.
Disconnect the coupler of a sensor (e.g.,
engine temperature sensor) that normally
activates the check engine warning indi-
cator when a malfunction occurs.
Check that the warning light and check
engine warning indicator begin to blink
and the buzzer sounds intermittently.
ProCarManuals.com

7-59
E
–+ELEC
REMOTE CONTROL SYSTEM
(DELUXE MODEL ONLY)
REMOTE CONTROL SYSTEM
Yamaha Security System indicator
1. Check:
Yamaha Security System indicator
Check that the “SECURITY” indicator
light 1 comes on when the Yamaha
Security System is deactivated (i.e., the
engine can be started).
Does not come on → Measure the
remote control unit output voltage.
2. Measure:
Remote control unit output voltage
Within specification → Replace the mul-
tifunction meter.
Out of specification → Replace the
remote control unit.
Remote control unit output
voltage:
Blue/yellow (L/Y) – ground
11–13 V
Measurement steps:
Disconnect the remote control unit 1
coupler from the multifunction meter.
Measure the remote control unit output
voltage while pushing the unlock button
of the remote control transmitter.
1
1
L/Y
1
Low-rpm mode indicator
1. Check:
Low-rpm mode indicator
Does not come on → Replace the multi-
function meter.
Checking steps:
Press the unlock button 1 of the remote
control transmitter for more than 4 sec-
onds to select the low-rpm mode.
Check that the beeper sounds three
times and that the “L-MODE” indicator
light 2 comes on.
1
ProCarManuals.com

7-60
E
–+ELEC
REMOTE CONTROL SYSTEM
(DELUXE MODEL ONLY)
Checking the remote control transmitter
1. Check:
Remote control transmitter
Does not operate → Replace the remote
control transmitter.
Checking steps:
CAUTION:
If the buttons on the remote control
transmitter are pushed but the transmit-
ter does not operate, the battery may be
low.
Press the lock button 1 of the remote
control transmitter. The beeper sounds
once.
Check that the “SECURITY” indicator
light goes off and that the engine cannot
be started.
Press the unlock button 2 of the remote
control transmitter for a short time. The
beeper sounds two or three times.
Check that the “SECURITY” indicator
light comes on and that the engine can
be started.
Press the unlock button for more than 4
seconds to select the low-rpm mode.
Check that the beeper sounds three
times and that the “L-MODE” indicator
light comes on.
Number of
beepsYamaha
Security
System modeEngine
startability
1 beep Lock Unable
2 beepsUnlock
(normal mode)Able
3 beepsUnlock
(low-rpm
mode)Able
12
ProCarManuals.com

9-7
E
TRBL
ANLS
TROUBLE ANALYSIS
Starting system
Start switch 7
Starter relay 7
Starter motor 7
Charging system
Lighting coil 7
Rectifier/regulator 7
Fuses 7
Battery leads—
Battery 3
Remote control system (Deluxe model only)
Remote control unit 7
HULL AND HOOD
Steering column 8
Water lock 8
Exhaust hose 8
Muffler 8
Drain plugs 8 Trouble mode Check elements
ENGINE WILL NOT START
HARD STARTING
ROUGH IDLING
HIGH IDLING
ENGINE STALLS
POOR ACCELERATION
ENGINE WILL NOT STOP
POOR PERFORMANCE
LIMITED ENGINE SPEED
OVERHEATING
LOW OIL PRESSURE
LOOSE STEERING
BILGE INCREASE
IRREGULAR WARNING INDICATION
POOR BATTERY CHARGING
Relative partReference
chapter
ProCarManuals.com