Yamaha Mt 01 T 2005 Manual

ELECTRICAL COMPONENTS
7-106



 





 
 








 
 



 
 



 



a. Disconnect the decompression solenoid cou-
plers from the wire harness.
b. Connect the pocket tester (Ω × 10) to the de-
compression solenoid coupler as shown.
c. Measure the decompression solenoid (ther-
mistor) resistance.
        
2. Check:
Decompression solenoid resistance
Out of specification → Replace.



 





 
 








 
 



 
 



 



a. Connect the pocket tester (Ω × 1) to the de-...

ELECTRICAL COMPONENTS
7-107
ET5YU1007CHECKING THE AIR TEMPERATURE 
SENSOR
1. Remove:
Air temperature sensor
WARNING
EW5YU1002
Handle the air temperature sensor with 
special care.
Never subject the air temperature sensor to 
strong shocks. If the air temperature sen-
sor is dropped, replace it.
2. Check:
Air temperature sensor resistance
Out of specification → Replace.



 





 
 








 
 



 
 



 



a. Connect the pocket tester (Ω × 100) to the air 
temperature sensor terminal as shown.
b....

ELECTRICAL COMPONENTS
7-108
c. Check the muffler cooling fan motor move-
ment.
        
ET5YU1006
CHECKING THE MUFFLER COOLING FAN 
TEMPERATURE SENSOR
1. Remove:
Muffler cooling fan temperature sensor
WARNING
EW5YU1003
Handle the muffler cooling fan temperature 
sensor with special care.
Never subject the intake muffler cooling fan 
temperature sensor to strong shocks. If the 
intake muffler cooling fan temperature sen-
sor is dropped, replace it.
2. Check:
Muffler...

TRBL
SHTG
8 

8
TROUBLESHOOTING
TROUBLESHOOTING..................................................................................... 8-1
GENERAL INFORMATION ....................................................................... 8-1
STARTING FAILURES .............................................................................. 8-1
INCORRECT ENGINE IDLING SPEED .................................................... 8-1
POOR MEDIUM AND HIGH-SPEED PERFORMANCE ........................... 8-2
FAULTY GEAR SHIFTING...

TROUBLESHOOTING
8-1
EAS28450
TROUBLESHOOTING
EAS28460
GENERAL INFORMATION
NOTE:
The following guide for troubleshooting does not 
cover all the possible causes of trouble. It should 
be helpful, however, as a guide to basic trouble-
shooting. Refer to the relative procedure in this 
manual for checks, adjustments, and replace-
ment of parts.
EAS28470STARTING FAILURES
Engine
1. Cylinder(s) and cylinder head(s)
Loose spark plug
Loose cylinder head or cylinder
Damaged cylinder head gasket
Damaged...

TROUBLESHOOTING
8-2
Electrical system
1. Battery
Discharged battery
Faulty battery
2. Spark plug(s)
Incorrect spark plug gap
Incorrect spark plug heat range
Fouled spark plug
Worn or damaged electrode
Worn or damaged insulator
Faulty spark plug cap
3. Ignition coil(s)
Broken or shorted primary or secondary coils
Faulty spark plug lead
Cracked or broken ignition coil
4. Ignition system
Faulty ECU
Faulty crankshaft position sensor
Broken generator rotor woodruff key
EAS28510POOR MEDIUM AND...

TROUBLESHOOTING
8-3
EAS28590OVERHEATING
Engine
1. Cylinder head(s) and piston(s)
Heavy carbon buildup
2. Engine oil
Incorrect oil level
Incorrect oil viscosity
Inferior oil quality
Fuel system
1. Throttle body(-ies)
Faulty throttle body(-ies)
Damaged or loose throttle body joint
2. Air filter
Clogged air filter element
Chassis
1. Brake(s)
Dragging brake
Electrical system
1. Spark plug(s)
Incorrect spark plug gap
Incorrect spark plug heat range
2. Ignition system
Faulty ECU
EAS28620
POOR...

TROUBLESHOOTING
8-4
Incorrect connection
Improperly grounded circuit
Poor contacts (main or light switch)
Burnt-out headlight bulb
Headlight bulb burnt out
Wrong headlight bulb
Faulty battery
Faulty rectifier/regulator
Improperly grounded circuit
Faulty main switch
Faulty light switch
Headlight bulb life expired
Tail/brake light does not come on
Wrong tail/brake light LED
Too many electrical accessories
Incorrect connection
Burnt-out tail/brake light LED
Tail/brake light LED burnt out...