Yamaha Mt 01 T 2005 Manual

ISC (IDLE SPEED CONTROL) UNIT
6-13
ET5YU1015CHECKING THE ISC (IDLE SPEED 
CONTROL) SYSTEM
1. Check:
Hoses
Loose connections → Connect properly.
Cracks/damage → Replace.
2. Check:
Surge tank
Cracks/damage → Replace.
3. Check:
One-way valve
Cracks/damage/faulty → Replace.
NOTE:
Check that air flows smoothly only in the direc-
tion of the arrow shown in the illustration.
4. Check:
Intake solenoid
Damage → Replace. 

ELEC
7
–+ 

7
ELECTRICAL SYSTEM
IGNITION SYSTEM......................................................................................... 7-1
CIRCUIT DIAGRAM .................................................................................. 7-1
TROUBLESHOOTING .............................................................................. 7-3
ELECTRIC STARTING SYSTEM.................................................................... 7-5
CIRCUIT DIAGRAM...

ELECTRICAL COMPONENTS...................................................................... 7-85
CHECKING THE SWITCHES ................................................................. 7-89
CHECKING THE BULBS AND BULB SOCKETS ................................... 7-92
CHECKING THE FUSES ........................................................................ 7-93
CHECKING AND CHARGING THE BATTERY ....................................... 7-94
CHECKING THE RELAYS...

IGNITION SYSTEM
7-1
EAS27090
IGNITION SYSTEM
EAS27110
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
Sb/W
R/LL/W1
L/Y L/GSbL
/R
B
/RB/YL
R
B1 B2
B1B2
BB2
LgR/WY/LR/GR/G
B2
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
B B B
R R
B
B
Y
L
BG
L/G L/G
B(BLUE)
L/G
B
(BLUE) (DARK GREEN)B
B
B3
B3
WL
B
LW/YB/LB/L Br/Y
B B
L B/L
G/Y
Br/B B/RY/B Gy
Lg
O
OGy/R
Gy/B
Gy/WB/GB3
B3GG/R
Y/GBr/LB/Y
Y/L
Gy1
L/RL/Y
R/L
R/W
Y
W/Y W/B W/R
W/G R/B
R/BR/G
BrGy/GBr/Y...

IGNITION SYSTEM
7-2
3. Main switch
4. Battery
8. Main fuse
10.ECU fuse
13.Relay unit
14.Starting circuit cut-off relay
16.Neutral switch
19.Sidestand switch
20.Crankshaft position sensor
24.Lean angle cut-off switch
29.ECU (electronic control unit)
32.Spark plug
33.Cylinder-#2 right ignition coil
34.Cylinder-#2 left ignition coil
35.Cylinder-#1 left ignition coil
36.Cylinder-#1 right ignition coil
56.Clutch switch
73.Engine stop switch
81.Ignition fuse 

IGNITION SYSTEM
7-3
EAS27150TROUBLESHOOTING
The ignition system fails to operate (no spark or intermittent spark).
NOTE:
Before troubleshooting, remove the following part(s):
1. Seat
2. Fuel tank
3. Air filter case
4. Battery box
5. Engine
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 OK →
NG ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓ 1. Check the fuses.
(Main, ignition, 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...

IGNITION SYSTEM
7-4
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓ 8. Check the main switch.
Refer to “CHECKING THE 
SWITCHES” on page 7-89.Replace the main switch/immobilizer unit.
9. Check the engine stop switch.
Refer to “CHECKING THE 
SWITCHES” on page 7-89.Replace the right handlebar switch.
10.Check the neutral switch.
Refer to “CHECKING THE 
SWITCHES” on page 7-89.Replace the neutral switch.
11.Check the sidestand switch.
Refer...

ELECTRIC STARTING SYSTEM
7-5
EAS27160
ELECTRIC STARTING SYSTEM
EAS27170
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
Sb/WR/L
L/W1
L/Y L/GSbL
/R B
/RB/YL
R
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
P/W
(BLACK)
(BLACK)(BLACK)(BLACK)
(BLACK)BrB
LgBr/B
Br/B
R/B
R/BR/G
P/L W/G
Br/L...