Yamaha Mt 01 T 2005 Manual

ELECTRICAL COMPONENTS
7-96



 





 
 








 
 



 
 



 



Charging method using a constant volt-
age 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.
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...

ELECTRICAL COMPONENTS
7-97
Relay unit (starting circuit cut-off relay)
Relay unit (fuel pump relay)
Headlight relayMuffler cooling fan motor relay
ET5YU1021
CHECKING THE TURN SIGNAL/HAZARD 
RELAY
1. Check:
Turn signal/hazard relay input voltage
Out of specification → The wiring circuit from 
the main switch to the turn signal/hazard re-
lay coupler is faulty and must be repaired.



 





 
 



 
 



 
 



 
 



 



a. Connect the pocket tester (DC 20 V) to the 
turn signal/hazard relay terminal...

ELECTRICAL COMPONENTS
7-98
b. Turn the main switch to “ON”.
c. Measure the turn signal/hazard relay input 
voltage.
        
2. Check:
Turn signal/hazard relay output voltage
Out of specification → Replace.



 





 
 








 
 



 
 



 



a. Connect the pocket tester (DC 20 V) to the 
turn signal/hazard relay terminal as shown.
b. Turn the main switch to “ON”.
c. Measure the turn signal/hazard relay output 
voltage.
        ...

ELECTRICAL COMPONENTS
7-99



 





 
 








 
 



 
 



 



a. Disconnect the relay unit coupler from the 
wire harness.
b. Connect the pocket tester (Ω × 1) to the relay 
unit terminal as shown.
c. Check the relay unit (diode) for continuity.
d. Check the relay unit (diode) for no continuity.
        
EAS28070
CHECKING THE SPARK PLUG CAPS
The following procedure applies to all of the 
spark plug caps.
1. Check:
Spark plug cap resistance
Out of specification →...

ELECTRICAL COMPONENTS
7-100
c. Measure the secondary coil resistance.
        
ET5YU1032
CHECKING THE IGNITION SPARK GAP
1. Check:
Ignition spark gap
Out of specification → Perform the ignition 
system troubleshooting, starting with step 5.
Refer to “TROUBLESHOOTING” on page 
7-3.
NOTE:
If the ignition spark gap is within specification, 
the ignition system circuit is operating normally.



 





 
 








 
 



 
 



 



a. Disconnect the spark plug cap from the...

ELECTRICAL COMPONENTS
7-101
2. Check:
Lean angle cut-off switch output voltage
Out of specification → Replace.



 





 
 








 
 



 
 



 



a. Connect the lean angle cut-off switch coupler 
to the lean angle cut-off switch.
b. Connect the pocket tester (DC 20 V) to the 
lean angle cut-off switch coupler as shown.
c. Turn the lean angle cut-off switch to 65°.
d. Measure the lean angle cut-off switch output 
voltage.
        
EAS28150CHECKING THE STATOR COIL
1....

ELECTRICAL COMPONENTS
7-102



 





 
 








 
 



 
 



 



a. Set the engine tachometer to the cylinder-#1 
left spark plug lead or right spark plug lead.
b. Connect the pocket tester (DC 20 V) to the 
rectifier/regulator coupler as shown.
c. Start the engine and let it run at approximate-
ly 5000 r/min.
d. Measure the charging voltage.
        
EAS28180
CHECKING THE HORN
1. Check:
Horn resistance
Out of specification → Replace.



 





 
 








 
 



 
...

ELECTRICAL COMPONENTS
7-103



 





 
 








 
 



 
 



 



a. Connect the pocket tester (Ω × 1k) to the en-
gine temperature sensor terminal as shown.
b. Immerse the engine temperature sensor “1” 
in a container filled with water “2”.
NOTE:
Make sure that the engine temperature sensor 
terminals do not get wet.
c. Place a thermometer “3” in the water.
d. Slowly heat the water, then let it cool down to 
the specified temperature.
e. Measure the engine temperature sensor re-
sistance.
 ...

ELECTRICAL COMPONENTS
7-104
b. Turn the main switch to “ON”.
c. Elevate the rear wheel and slowly rotate it.
d. Measure the voltage of white/yellow and 
black/blue. With each full rotation of the rear 
wheel, the voltage reading should cycle from 
0.6 V to 4.8 V to 0.6 V to 4.8 V.
        
EAS28300CHECKING THE THROTTLE POSITION 
SENSOR
1. Remove:
Throttle position sensor
(from the throttle body)
2. Check:
Throttle position sensor maximum resistance
Out of specification →...

ELECTRICAL COMPONENTS
7-105



 





 
 








 
 



 
 



 



a. Insert a plug “1” into the fuel return hose end.
b. Fill the fuel tank.
c. Put the end of the fuel hose “2” into an open 
container.
d. Connect the battery (DC 12 V) to the fuel 
pump terminal as shown.
e. Check the fuel pump operation.
        
EAS28360
CHECKING THE EXUP SERVO MOTOR
1. Check:
EXUP servo motor operation
Out of specification → Replace.



 





 
 








 
 



 
 



 



a....