Yamaha Mt 01 T 2005 Manual

							ELECTRICAL COMPONENTS
7-86
1. Air temperature sensor
2. Cylinder-#2 left ignition coil
3. Cylinder-#2 right ignition coil
4. ISC (idle speed control) unit
5. Intake solenoid
6. Cylinder-#1 right ignition coil
7. Cylinder-#1 left ignition coil
8. Muffler cooling fan temperature sensor
9. Muffler cooling fan motor
10.Speed sensor
11.Rear brake light switch
12.Neutral switch
13.Decompression solenoid
14.Rectifier/regulator
15.Horn 
						

							ELECTRICAL COMPONENTS
7-87
346
5
8 7
9
11
12
13
14
15
16 17 18 12
10 
						

							ELECTRICAL COMPONENTS
7-88
1. Cylinder-#1 intake air pressure sensor
2. Cylinder-#2 intake air pressure sensor
3. Immobilizer unit
4. Throttle position sensor
5. Main fuse
6. Fuse box
7. Muffler cooling fan motor relay
8. ECU (electronic control unit)
9. Headlight relay
10.Relay unit
11.Turn signal/hazard relay
12.Fuel injection system fuse
13.Starter relay
14.Lean angle cut-off switch
15.Battery
16.EXUP servo motor
17.Crankshaft position sensor
18.Engine temperature sensor 
						

							ELECTRICAL COMPONENTS
7-89
EAS27980CHECKING THE SWITCHES
Br/WBL/B
R/Y
B/YPGY
BDg
Ch
B
B
(BLACK)
R/WL/W
R/B B
B/Y
B
(BLUE)
(BROWN)
B
B
(BLUE)
B
B
B
B
B
11
12
1385
6
9
10 1
2
7 3BB
R/YY
YL/BG
DgBr/WCh
DgBr/WCh
PB/Y
BB
R/WR/B
L/WB/YR
Br/L
Br/R4
RBr/LBr/RON
OFFL/WB/Y 
						

							ELECTRICAL COMPONENTS
7-90
1. Front brake light switch
2. Engine stop switch
3. Start switch
4. Main switch
5. Neutral switch
6. Sidestand switch
7. Rear brake light switch
8. Hazard switch
9. Turn signal switch
10.Horn switch
11.Clutch switch
12.Pass switch
13.Dimmer switch 
						

							ELECTRICAL COMPONENTS
7-91
Check each switch for continuity with the pocket tester. If the continuity reading is incorrect, check the 
wiring connections and if necessary, replace the switch.
CAUTION:
ECA14370
Never insert the tester probes into the coupler terminal slots “a”. Always insert the probes from 
the opposite end of the coupler, taking care not to loosen or damage the leads.
NOTE:
Before checking for continuity, set the pocket tester to “0” and to the “Ω × 1” range.
When checking for continuity, switch back and forth between the switch positions a few times.
The switches and their terminal connections are illustrated as in the following example of the main 
switch.
The switch positions “a” are shown in the far left column and the switch lead colors “b” are shown in the 
top row. 
The continuity (i. e., a closed circuit) between switch terminals at a given switch position is indication 
by “” There is continuity between red, brown/blue, and brown/red when the switch is set to 
“ON” and between red and brown/red when the switch is set to “”.
 
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
ONR
Br/L Br/R
OFF
P
Br/RR
Br/L
ab 
						

							ELECTRICAL COMPONENTS
7-92
EAS27990CHECKING THE BULBS AND BULB 
SOCKETS
NOTE:
Do not check any of the lights that use LEDs.
Check each bulb and bulb socket for damage or 
wear, proper connections, and also for continuity 
between the terminals.
Damage/wear → Repair or replace the bulb, 
bulb socket or both.
Improperly connected → Properly connect.
No continuity → Repair or replace the bulb, bulb 
socket or both.
Types of bulbs
The bulbs used on this vehicle are shown in the 
following illustration.
Bulbs “a” and “b” are used for the headlights 
and usually use a bulb holder that must be de-
tached before removing the bulb. The majority 
of these types of bulbs can be removed from 
their respective socket by turning them coun-
terclockwise.
Bulbs “c” are used for turn signal and tail/brake 
lights and can be removed from the socket by 
pushing and turning the bulb counterclockwise.
Bulbs “d” and “e” are used for meter and indi-
cator lights and can be removed from their re-
spective socket by carefully pulling them out.
Checking the condition of the bulbs
The following procedure applies to all of the 
bulbs.1. Remove:
Bulb
WARNING
EW5YU1009
Since headlight bulbs get extremely hot, 
keep flammable products and your hands 
away from them until they have cooled 
down.
CAUTION:
EC5YU1020
Be sure to hold the socket firmly when re-
moving the bulb. Never pull the lead, other-
wise it may be pulled out of the terminal in 
the coupler.
Avoid touching the glass part of a headlight 
bulb to keep it free from oil, otherwise the 
transparency of the glass, the life of the 
bulb, and the luminous flux will be adverse-
ly affected. If a headlight bulb gets soiled, 
thoroughly clean it with a cloth moistened 
with alcohol or lacquer thinner.
2. Check:
Bulb (for continuity)
(with the pocket tester)
No continuity → Replace.
NOTE:
Before checking for continuity, set the pocket 
tester to “0” and to the “Ω × 1” range.



 





 
 



 
 



 
 



 
 



 



a. Connect the positive tester probe to terminal 
“1” and the negative tester probe to terminal 
“2”, and check the continuity.
b. Connect the positive tester probe to terminal 
“1” and the negative tester probe to terminal 
“3”, and check the continuity.
c. If either of the readings indicate no continuity, 
replace the bulb.
          
 
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C 
						

							ELECTRICAL COMPONENTS
7-93
Checking the condition of the bulb sockets
The following procedure applies to all of the bulb 
sockets.
1. Check:
Bulb socket (for continuity)
(with the pocket tester)
No continuity → Replace.
NOTE:
Check each bulb socket for continuity in the 
same manner as described in the bulb section; 
however, note the following.



 





 
 








 
 



 
 



 



a. Install a good bulb into the bulb socket.
b. Connect the pocket tester probes to the re-
spective leads of the bulb socket.
c. Check the bulb socket for continuity. If any of 
the readings indicate no continuity, replace 
the bulb socket.
        
EAS28000CHECKING THE FUSES
The following procedure applies to all of the fus-
es.
CAUTION:
EC5YU1013
To avoid a short circuit, always turn the main 
switch to “OFF” when checking or replacing 
a fuse.
1. Remove:
Seat
Lead holder
Refer to “GENERAL CHASSIS” on page 4-1.
2. Check:
Fuse



 





 
 



 
 



 
 



 
 



 



a. Connect the pocket tester to the fuse and 
check the continuity.
NOTE:
Set the pocket tester selector to “Ω × 1”.
b. If the pocket tester indicates “∞”, replace the 
fuse.
          
3. Replace:
Blown fuse



 





 
 



 
 



 
 



 
 



 



a. Turn the main switch to “OFF”.
b. Install a new fuse of the correct amperage 
rating.
c. Set on the switches to verify if the electrical 
circuit is operational.
d. If the fuse immediately blows again, check 
the electrical circuit.
WARNING
EWA13310
Never use a fuse with an amperage rating 
other than that specified. Improvising or us-
ing a fuse with the wrong amperage rating 
may cause extensive damage to the electri-
 
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
 
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
FusesAmperage 
ratingQ’ty
Main 50 A 1
Ignition 25 A 1
Headlight 15 A 1
Fuel injection system 15 A 1
Muffler cover fan 15 A 1
Auto decompression 15 A 1
Signaling system 10 A 1
Parking lighting 10 A 1
ECU 10 A 1
Backup (odometer, 
clock and immobilizer 
system)10 A 1
Spare 25 A 1
Spare 15 A 1
Spare 10 A 1 
						

							ELECTRICAL COMPONENTS
7-94
cal system, cause the lighting and ignition 
systems to malfunction and could possibly 
cause a fire.
        
4. Install:
Lead holder
Seat
Refer to “GENERAL CHASSIS” on page 4-1.
EAS28030
CHECKING AND CHARGING THE BATTERY
WARNING
EWA13290
Batteries generate explosive hydrogen gas 
and contain electrolyte which is made of poi-
sonous and highly caustic sulfuric acid. 
Therefore, always follow these preventive 
measures:
Wear protective eye gear when handling or 
working near batteries.
Charge batteries in a well-ventilated area.
Keep batteries away from fire, sparks or 
open flames (e.g., welding equipment, 
lighted cigarettes).
DO NOT SMOKE when charging or han-
dling batteries.
KEEP BATTERIES AND ELECTROLYTE 
OUT OF REACH OF CHILDREN.
Avoid bodily contact with electrolyte as it 
can cause severe burns or permanent eye 
injury.
FIRST AID IN CASE OF BODILY CONTACT:
EXTERNAL
Skin — Wash with water.
Eyes — Flush with water for 15 minutes and 
get immediate medical attention.
INTERNAL
Drink large quantities of water or milk fol-
lowed with milk of magnesia, beaten egg or 
vegetable oil. Get immediate medical atten-
tion.
CAUTION:
ECA13660
This is a sealed battery. Never remove the 
sealing caps because the balance between 
cells will not be maintained and battery per-
formance will deteriorate.
Charging time, charging amperage and 
charging voltage for an MF battery are dif-
ferent from those of conventional batteries. 
The MF battery should be charged as ex-
plained in the charging method illustra-
tions. If the battery is overcharged, the electrolyte level will drop considerably. 
Therefore, take special care when charging 
the battery.
NOTE:
Since MF batteries are sealed, it is not possible 
to check the charge state of the battery by mea-
suring the specific gravity of the electrolyte. 
Therefore, the charge of the battery has to be 
checked by measuring the voltage at the battery 
terminals.
1. Remove:
Seat
Refer to “GENERAL CHASSIS” on page 4-1.
2. Disconnect:
Battery leads
(from the battery terminals)
CAUTION:
ECA13640
First, disconnect the negative battery lead 
“1”, and then positive battery lead “2”.
3. Remove:
Battery band
Battery
4. Check:
Battery charge



 





 
 



 
 



 
 



 
 



 



a. Connect a pocket tester to the battery termi-
nals.
NOTE:
The charge state of an MF battery can be 
checked by measuring its open-circuit voltage 
(i.e., the voltage when the positive battery ter-
minal is disconnected).
No charging is necessary when the open-cir-
cuit voltage equals or exceeds 12.8 V. Positive tester probe →
positive battery terminal
Negative tester probe →
negative battery terminal
1
2 
						

							ELECTRICAL COMPONENTS
7-95
b. Check the charge of the battery, as shown in 
the charts and the following example.
        
5. Charge:
Battery
(refer to the appropriate charging method)
WARNING
EWA13300
Do not quick charge a battery.
CAUTION:
ECA13670
Never remove the MF battery sealing caps.
Do not use a high-rate battery charger 
since it forces a high-amperage current 
into the battery quickly and can cause bat-
tery overheating and battery plate damage.
If it is impossible to regulate the charging 
current on the battery charger, be careful 
not to overcharge the battery.
When charging a battery, be sure to remove 
it from the vehicle. (If charging has to be 
done with the battery mounted on the vehi-
cle, disconnect the negative battery lead 
from the battery terminal.)
To reduce the chance of sparks, do not 
plug in the battery charger until the battery 
charger leads are connected to the battery.
Before removing the battery charger lead 
clips from the battery terminals, be sure to 
turn off the battery charger.
Make sure the battery charger lead clips are 
in full contact with the battery terminal and 
that they are not shorted. A corroded bat-
tery charger lead clip may generate heat in 
the contact area and a weak clip spring may 
cause sparks.
If the battery becomes hot to the touch at 
any time during the charging process, dis-
connect the battery charger and let the bat-
tery cool before reconnecting it. Hot 
batteries can explode!
As shown in the following illustration, the 
open-circuit voltage of an MF battery stabi-
lizes about 30 minutes after charging has 
been completed. Therefore, wait 30 min-
utes after charging is completed before 
measuring the open-circuit voltage.



 





 
 



 
 



 
 



 
 



 



Charging method using a variable-current 
(voltage) charger
a. Measure the open-circuit voltage prior to 
charging.
NOTE:
Voltage should be measured 30 minutes after 
the engine is stopped.
b. Connect a charger and ammeter to the bat-
tery and start charging.
NOTE:
Set the charging voltage at 16–17 V.If the setting 
is lower, charging will be insufficient. If too high, 
the battery will be over-charged.
c. Make sure that the current is higher than the 
standard charging current written on the bat-
tery.
NOTE:
If the current is lower than the standard charging 
current written on the battery, set the charging 
voltage adjust dial at 20–24 V and monitor the 
amperage for 3–5 minutes to check the battery.
d. Adjust the voltage so that the current is at the 
standard charging level.
e. Set the time according to the charging time 
suitable for the open-circuit voltage.
Refer to “Battery condition checking steps”.
f. If charging requires more than 5 hours, it is 
advisable to check the charging current after 
a lapse of 5 hours. If there is any change in 
the amperage, readjust the voltage to obtain 
the standard charging current.
g. Measure the battery open-circuit voltage after 
leaving the battery unused for more than 30 
minutes.
          
Example
Open-circuit voltage = 12.0 V
Charging time = 6.5 hours
Charge of the battery = 20–30%
Standard charging current is reached
Battery is good.
Standard charging current is not reached
Replace the battery.
12.8 V or more --- Charging is complete.
12.7 V or less --- Recharging is required.
Under 12.0 V --- Replace the battery.