Yamaha Mt 01 T 2005 Manual

ELECTRIC STARTING SYSTEM
7-6
3. Main switch
4. Battery
6. Starter relay
7. Starter motor
8. Main fuse
10.ECU fuse
13.Relay unit
14.Starting circuit cut-off relay
16.Neutral switch
19.Sidestand switch
29.ECU (electronic control unit)
38.Decompression solenoid
56.Clutch switch
70.Auto decompression fuse
73.Engine stop switch
74.Start switch
81.Ignition fuse 

ELECTRIC STARTING SYSTEM
7-7
EAS27180STARTING CIRCUIT CUT-OFF SYSTEM OPERATION
If the engine stop switch is set to “” and the main switch is turned “ON” (both switch circuits are 
closed), the starter motor can only operate if at least one of the following conditions is met:
The transmission is in neutral (the neutral switch circuit is closed).
The clutch lever is pulled to the handlebar (the clutch switch circuit is closed) and the sidestand is up 
(the sidestand switch circuit is closed).
The...

ELECTRIC STARTING SYSTEM
7-8
a. WHEN THE TRANSMISSION IS IN 
NEUTRAL
b. WHEN THE SIDESTAND IS UP AND THE 
CLUTCH LEVER IS PULLED TO THE 
HANDLEBAR
1. Battery
2. Main fuse
3. Main switch
4. Ignition fuse
5. Engine stop switch
6. Relay unit (starting circuit cut-off relay)
7. Relay unit (diode)
8. Clutch switch
9. Sidestand switch
10.Neutral switch
11.Start switch
12.Starter relay
13.Starter motor
14.ECU fuse
15.Auto decompression fuse
16.Decompression solenoid
17.ECU (electronic control unit) 

ELECTRIC STARTING SYSTEM
7-9
EAS27190TROUBLESHOOTING
The starter motor fails to turn.
NOTE:
Before troubleshooting, remove the following part(s):
1. Seat
2. Fuel tank
3. Air filter case
4. Oil tank
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓ 1. Check the fuses.
(Main, ignition, auto 
decompression, and ECU)
Refer to “CHECKING THE FUSES” 
on page 7-93.Replace the fuse(s).
2. Check the battery.
Refer to “CHECKING AND 
CHARGING THE BATTERY” on 
page...

ELECTRIC STARTING SYSTEM
7-10
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓ 8. Check the engine stop switch.
Refer to “CHECKING THE 
SWITCHES” on page 7-89.Replace the right handlebar switch.
9. Check the neutral switch.
Refer to “CHECKING THE 
SWITCHES” on page 7-89.Replace the neutral switch.
10.Check the sidestand switch.
Refer to “CHECKING THE 
SWITCHES” on page 7-89.Replace the sidestand switch.
11.Check the clutch switch.
Refer to “CHECKING THE...

CHARGING SYSTEM
7-11
EAS27200
CHARGING SYSTEM
EAS27210
CIRCUIT DIAGRAM
B1 B2
B1B2
R/G
B2
LgY/L
R/W
B
B
B
ON
OFF
BBB
R
R
B
BYL
BG
L/G
L/G
B(BLUE)
L/G
B
(BLUE) (DARK GREEN)B
B
WL
B
LW/YB/L
B B
LB/L
B
GBR/L
B/LGy1
Gy
B
LB/LW/Y
L
B/LB/L
Br/YBr/W
P/W
(BLACK)
(BLACK)(BLACK)
(BLACK)BrB
B/L
B/L
P/Y
L
Y/G
B/L
Y/GLY
YD
B
BB
L
LD
Br
Br
Br
B
D
R
R
Br
Br/LBr/R
Br/G
R
Gy/R
R
RRR
R/BBr/W
BB
RR
RBB
R/W
R/WR
L
L
B
BB3 BB2
BB1 BB4BB
BB
B1BB4BB3BB2BB1
Br/WB/L
B/LL
P/YY(BLACK)LB
Sb
BSb
R/LL/RL/YB/R
L/W1
Sb/WSb
R
L
(BLACK)...

CHARGING SYSTEM
7-12
1. AC magneto
2. Rectifier/regulator
4. Battery
8. Main fuse 

CHARGING SYSTEM
7-13
EAS27220TROUBLESHOOTING
The battery is not being charged.
NOTE:
Before troubleshooting, remove the following part(s):
1. Seat
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓ 1. Check the fuse.
(Main)
Refer to “CHECKING THE FUSES” 
on page 7-93.Replace the fuse.
2. Check the battery.
Refer to “CHECKING AND 
CHARGING THE BATTERY” on 
page 7-94.Clean the battery terminals.
Recharge or replace the battery.
3. Check the stator coil.
Refer to “CHECKING THE STATOR 
COIL”...

CHARGING SYSTEM
7-14 

LIGHTING SYSTEM
7-15
EAS27240
LIGHTING SYSTEM
EAS27250
CIRCUIT DIAGRAM
Br/W
B
L/B
R/Y
B/YPGY
BDg
Ch
Br/W
L/YG/L
R/Y
B/Y
B G Y
B Dg
Ch
B1 B2
B1B2
R/GB2
LgY/L
R/W
B
B
BL G
G
Sb/W
R/GLg
Dg
R/WCh Y/L Y/L
YLR/W
R/G
Lg
B
B
ON
OFF
BBB
R
R
B
BYL
BG
L/GL/GB(BLUE)
L/G
B
(BLUE) (DARK GREEN)B
B
B3B3
WL
B
LW/YB/L
B B
LB/L
B
GBR/L
B
Y
B
G
B/LGy1
Gy
B
LB/LW/Y
L
B/LB/L
Br/YBr/W
P/W
(BLACK)
(BLACK)(BLACK)
(BLACK)BrB
LgBr/B
Br/B
R/B
R/BR/G
P/L W/G
Br/L
B/BrB/Br
P/YP/W
P/LW/GW/RBr/LR/G
P/LW/GBr/LR/G
R/B
B/L
B/L
P/Y
L...