2012 YAMAHA MT-03 check engine

TABLE OF CONTENTS
SAFETY INFORMATION.....................1-1
Safe riding .........................................1-1
Protective apparel.............................1-2
Modifications .....................................1-2
Loading and accessories ..................1-2
Gasoline and exhaust gas ................1-4
DESCRIPTION.....................................2-1
Left view ............................................2-1
Right view .........................................2-2
Controls and instruments ..................2-3
INSTRUMENT AND CONTROL
FUNCTIONS........................................3-1
Immobilizer system...........................3-1
Main switch/steering lock ..................3-2
Indicator and warning lights ..............3-3
Multi-function meter unit ...................3-5
Tachometer .......................................3-6
Odometer, tripmeter modes ..............3-6
Clock mode .......................................3-7
Self-diagnosis devices......................3-7
Indicator lights brightness
control mode..............................3-8
Anti-theft alarm (optional) .................3-8
Handlebar switches...........................3-9
Clutch lever .....................................3-10
Shift pedal.......................................3-10
Brake lever ......................................3-11Brake pedal.....................................3-11
Fuel tank cap...................................3-11
Fuel .................................................3-12
Fuel tank breather/overflow hose ...3-13
Catalytic converter..........................3-13
Seats ...............................................3-14
Adjusting the shock absorber
assembly..................................3-16
Sidestand........................................3-18
Ignition circuit cut-off system ..........3-19
PRE-OPERATION CHECKS...............4-1
Pre-operation check list ....................4-2
OPERATION AND IMPORTANT
RIDING POINTS..................................5-1
Starting the engine............................5-1
Shifting ..............................................5-2
Tips for reducing fuel consumption ...5-3
Engine break-in .................................5-3
Parking..............................................5-4
PERIODIC MAINTENANCE
AND MINOR REPAIR.........................6-1
Owner’s tool kit.................................6-1
Periodic maintenance and
lubrication chart..........................6-2
Removing and installing panels ........6-6
Checking the spark plug ...................6-6Engine oil and oil filter element.........6-8
Coolant............................................6-12
Replacing the air filter element
and cleaning the check hoses ...6-13
Adjusting the engine idling speed ...6-14
Checking the throttle cable
free play...................................6-15
Valve clearance...............................6-15
Tires ................................................6-16
Cast wheels....................................6-19
Adjusting the clutch lever
free play...................................6-19
Checking the front and rear
brake pads...............................6-20
Checking the brake fluid level .........6-21
Changing the brake fluid .................6-22
Drive chain slack .............................6-23
Cleaning and lubricating the
drive chain ................................6-24
Checking and lubricating the
cables .......................................6-25
Checking and lubricating the
throttle grip and cable ..............6-25
Checking and lubricating the
brake and clutch levers ............6-26
Lubricating the brake pedal............6-26
Checking and lubricating the
sidestand..................................6-27
Lubricating the side suspension .....6-27

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INSTRUMENT AND CONTROL FUNCTIONS
3-3
To unlock the steering
1. Push
2. Turn
Push the key in, and then turn it to
“OFF” while still pushing it.
EWA10060
WARNING0
Never turn the key to “OFF” or
“LOCK” while the vehicle is moving,
otherwise the electrical systems
will be switched off, which may re-
sult in loss of control or an acci-
dent. Make sure that the vehicle is
stopped before turning the key to
“OFF” or “LOCK”.
EAU10941
F(Parking)
The steering is locked, and the tail-
light, license plate light and auxiliary
lights are on. The hazard lights and
turn signal lights can be turned on, but
all other electrical systems are off. The
key can be removed.
The steering must be locked before
the key can be turned to “F”.
ECA11020CAUTION:
Do not use the parking position for
an extended length of time, other-
wise the battery may discharge.
EAU11003
Indicator and warning lights
1. Immobilizer system indicator light “ ”
2. Neutral indicator light “N”
3. Turn signal indicator light “y”
4. High beam indicator light “1”
5. Engine trouble warning light “U”
6. Coolant temperature warning light “u”
7. Fuel level warning light “K”
EAU26873
Immobilizer system indicator
light “ ”
The electrical circuit of the indicator
light can be checked by turning the
key to “ON”.
If the indicator light does not come on
for a few seconds, then go off, have a
Yamaha dealer check the electrical
circuit.

INSTRUMENT AND CONTROL FUNCTIONS
3-4
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When the key is turned to “OFF” and
30 seconds have passed, the indicator
light will start flashing indicating the
immobilizer system is enabled. After
24 hours have passed, the indicator
light will stop flashing, however the im-
mobilizer system is still enabled.
This model is also equipped with a
self-diagnosis device for the immobi-
lizer system. (See page 3-7 for an ex-
planation of the self-diagnosis device.)
EAU11060
Neutral indicator light “N”
This indicator light comes on when the
transmission is in the neutral position.
EAU11020
Turn signal indicator light “y”
This indicator light flashes when the
turn signal switch is pushed to the left
or right.
EAU11080
High beam indicator light “1”
This indicator light comes on when the
high beam of the headlight is switched
on.
EWA10060
WARNING0
Never turn the key to “OFF” or
“LOCK” while the vehicle is moving,
otherwise the electrical systems
will be switched off, which may re-
sult in loss of control or an acci-
dent. Make sure that the vehicle is
stopped before turning the key to
“OFF” or “LOCK”.
EAU11530
Engine trouble warning light “U”
This warning light comes on or flashes
when an electrical circuit monitoring
the engine is defective. When this oc-
curs, have a Yamaha dealer check the
self-diagnosis system. (See page 3-7
for an explanation of the self-diagno-
sis device.)
The electrical circuit of the warning
light can be checked by turning the
key to “ON”. If the warning light does
not come on for a few seconds, then
go off, have a Yamaha dealer check
the electrical circuit.
EAU11440
Coolant temperature warning
light “u”
This warning light comes on when the
engine overheats. When this occurs,
stop the engine immediately and allow
the engine to cool.
The electrical circuit of the warning
light can be checked by turning the
key to “ON”.
If the warning light does not come on
for a few seconds, then go off, have a
Yamaha dealer check the electrical
circuit.
ECA10020
CAUTION:
Do not operate the engine if it is
overheated.
EAU11361
Fuel level warning light “K”
This warning light comes on when the
fuel level drops below approximately
4.25 L (1.12 US gal) (0.93 Imp.gal).
When this occurs, refuel as soon as
possible.

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INSTRUMENT AND CONTROL FUNCTIONS
3-7
Clock mode
1. Clock
2. “SELECT” button
3. “RESET” button
Turn the key to “ON”.
T
o set the clock
1. Push the “SELECT” button for at
least two seconds.
2. When the hour digits start flash-
ing, push the “RESET” button to
set the hours.
3. Push the “SELECT” button, and
the minute digits will start flash-
ing.
4. Push the “RESET” button to set
the minutes.
5. Push the “SELECT” button, and
then release it to start the clock.
Self-diagnosis devices
1. Engine trouble warning light “U”
2. Immobilizer system indicator light “ ”
This model is equipped with a self-diag-
nosis device for various electrical cir-
cuits. If any of those circuits are defec-
tive, the engine trouble warning light
will start flashing. If this occurs, have a
Yamaha dealer check the vehicle.
This model is also equipped with a
self-diagnosis device for the immobi-
lizer system.
Turn the key to "ON". If any of the im-
mobilizer system circuits are defec-
tive, the immobilizer system indicator
light will flash, and it will indicate an er-
ror code.
If this occurs, have a Yamaha dealer
check the vehicle. However, if the indi-
cator light slowly flashes five times,
and then quickly flashes two times re-
peatedly, this error could be caused by
signal interference. If this occurs, try
the following.
1. Use the code re-registering key to
start the engine.
NOTE:
Make sure there are no other immobi-
lizer keys close to the main switch,
and do not keep more than one immo-
bilizer key on the same key ring! Im-
mobilizer system keys may cause sig-
nal interference, which may prevent
the engine from starting.
2. If the engine starts, turn it off and
try starting the engine with the
standard keys.
3. If one or both of the standard keys
do not start the engine, take the
vehicle, the code re-registering
key and both standard keys to a
Yamaha dealer and have the
standard keys re-registered.

INSTRUMENT AND CONTROL FUNCTIONS
3-8
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If the immobilizer system indicator
light flashes any error codes, have a
Yamaha dealer check the vehicle.
ECA11590CAUTION:
If the display indicates an error
code, the vehicle should be
checked as soon as possible in or-
der to avoid engine damage.Indicator lights brightness
control mode
●Indicator lights brightness:
This function allows you to adjust
the brightness of the indicator
lights to suit the outside lighting
conditions.
T
o adjust the brightness of the
indicator lights
1. Turn the key to “ON”.
2. Push the “SELECT” button to se-
lect ODO meter mode, and then
push the “RESET” button for at
least five seconds.
3. Release the “RESET” button, and
then select the desired lighting
brightness level by pushing the
“RESET” button.
EAU12331
Anti-theft alarm (optional)
This motorcycle can be equipped with
an optional anti-theft alarm by a Yama-
ha dealer. Contact a Yamaha dealer
for more information.

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INSTRUMENT AND CONTROL FUNCTIONS
3-13
EAUB1300
Fuel tank breather/overflow
hose
1. Fuel tank breather/overflow hose
2. Clamp
Before operating the motorcycle:
●Check the fuel tank breather/
overflow hose connection.
●Check the fuel tank breather/
overflow hose for cracks or dam-
age, and replace it if damaged.
●Make sure that the end of the fuel
tank breather/overflow hose is not
blocked, and clean it if necessary.
●Make sure that the end of the fuel
tank breather/overflow hose is
positioned inside of the clamp.
ECA11400CAUTION:
Use only unleaded gasoline. The
use of leaded gasoline will cause
severe damage to internal engine
parts, such as the valves and piston
rings, as well as to the exhaust sys-
tem.
Your Yamaha engine has been de-
signed to use premium unleaded
gasoline with a research octane num-
ber of 95 or higher. If knocking (or
pinging) occurs, use a gasoline of a
different brand. Use of unleaded fuel
will extend spark plug life and reduce
maintenance costs.
EAU13431
Catalytic converter
This model is equipped with a catalyt-
ic converter in the exhaust system.
EWA10860
WARNING0
The exhaust system is hot after op-
eration. Make sure that the exhaust
system has cooled down before do-
ing any maintenance work.

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INSTRUMENT AND CONTROL FUNCTIONS
EWA10240
WARNING0
The vehicle must not be ridden
with the sidestand down, or if the
sidestand cannot be properly
moved up (or does not stay up),
otherwise the sidestand could con-
tact the ground and distract the
operator, resulting in a possible
loss of control. Yamaha’s ignition
circuit cut-off system has been de-
signed to assist the operator in ful-
filling the responsibility of raising
the sidestand before starting off.
Therefore, check this system regu-
larly as described below and have
a Yamaha dealer repair it if it does
not function properly.
3-19
EAU15311
Ignition circuit cut-off
system
The ignition circuit cut-off system
(comprising the sidestand switch,
clutch switch and neutral switch) has
the following functions.
●It prevents starting when the
transmission is in gear and the
sidestand is up, but the clutch
lever is not pulled.
●It prevents starting when the
transmission is in gear and the
clutch lever is pulled, but the side-
stand is still down.
●It cuts the running engine when
the transmission is in gear and
the sidestand is moved down.
Periodically check the operation of the
ignition circuit cut-off system accord-
ing to the following procedure.
EWA10250
WARNING0
If a malfunction is noted, have a
Yamaha dealer check the system
before riding.

INSTRUMENT AND CONTROL FUNCTIONS
3-20
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With the engine turned off:
1. Move the sidestand down.
2. Make sure that the engine stop switch is turned on.
3. Turn the key on.
4. Shift the transmission into the neutral position.
5. Push the start switch.
Does the engine start?
With the engine still running:
6. Move the sidestand up.
7. Keep the clutch lever pulled.
8. Shift the transmission into gear.
9. Move the sidestand down.
Does the engine stall?
NOTE:
This check is most reliable if performed with a
warmed-up engine.
The neutral switch may be defective.
The motorcycle should not be riddenuntil checked by a
Yamaha dealer.
The sidestand switch may be defective.
The motorcycle should not be riddenuntil checked by a
Yamaha dealer.
The clutch switch may be defective.
The motorcycle should not be riddenuntil checked by a
Yamaha dealer.
After the engine has stalled:
10. Move the sidestand up.
11. Keep the clutch lever pulled.
12. Push the start switch.
Does the engine start?
The system is OK. The motorcycle can be ridden.
YES NO
NO YES
NO YES