Yamaha FZS6W 07 User Manual

ELECTRICAL COMPONENTS
8-80
b. Check the throttle position sensor maxi-mum resistance.
Out of specification  → Replace the throttle 
position sensor.
c. Connect the pocket tester ( Ω ×  1k) to the 
throttle position sensor as shown.
d. While slowly turning the throttle position  sensor shaft, check that  the throttle posi-
tion sensor resistance is within the speci-
fied range.
The resistance does not change or it 
changes abruptly  → Replace the throttle 
position sensor.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲...

ELECTRICAL COMPONENTS
8-81
b. Measure the fuel pump resistance.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
EAS28370
CHECKING THE AIR INDUCTION SYSTEM 
SOLENOID
1. Check: Air induction system solenoid resistanceOut of specification  → Replace.
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Remove the air induc tion system solenoid 
coupler from the wire harness.
b. Connect the pocket tester ( Ω ×  1) to the air 
induction system so lenoid terminal as 
shown.
c. Measure the air induc tion system solenoid 
resistance....

ELECTRICAL COMPONENTS
8-82
2. Check: Intake air temperature sensor resistanceOut of specification  → Replace.
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Connect the pocket tester ( Ω ×  100) to the 
intake air temperature sensor terminal as 
shown.
b. Measure the intake air temperature sensor  resistance.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
Intake air pressure sensor
resistance
2.2–2.7 k Ω at 20 °C (68 °F)
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
 Positive tester probe Brown/White “1”
 Negative...

ELECTRICAL COMPONENTS
8-83 

9
TROUBLESHOOTING
TROUBLESHOOTING.................................................................................. 9-1
GENERAL INFORMATION ..................................................................... 9-1
STARTING FAILURES ............................................................................ 9-1
INCORRECT ENGINE IDLING  SPEED ................................................. 9-1
POOR MEDIUM-AND-HIGH-SPEED  PERFORMANCE ........................ 9-2
FAULTY GEAR SHIFTING...

TROUBLESHOOTING
9-1
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 
troubleshooting. Refer to the relative proce-
dure in this manual for checks, adjustments, 
and replacement of parts.
EAS28470
STARTING FAILURES
Engine
1. Cylinder(s) and cylinder head(s) Loose spark plug
 Loose cylinder head or cylinder
 Damaged cylinder head gasket
 Damaged...

TROUBLESHOOTING
9-2
 Improper throttle cable free play
 Flooded throttle body
 Faulty air induction system
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...

TROUBLESHOOTING
9-3
2. Engine oil Incorrect oil level
 Incorrect oil viscosity
 Inferior oil quality
Cooling system
1. Coolant  Low coolant level
2. Radiator  Damaged or leaking radiator
 Faulty radiator cap
 Bent or damaged radiator fin
3. Water pump
 Damaged or faulty water pump
 Thermostat
 Thermostat stays closed
Oil cooler
 Clogged or damaged oil cooler
 Hose(s) and pipe(s)
 Damaged hose
 Improperly connected hose
 Damaged pipe
 Improperly connected pipe
Fuel system
1. Throttle...

TROUBLESHOOTING
9-4
 Faulty rear shock absorber spring
 Leaking oil or gas
6. Tire(s)
 Uneven tire pressures (front and rear)
 Incorrect tire pressure
 Uneven tire wear
7. Wheel(s)  Incorrect wheel balance
 Deformed cast wheel
 Damaged wheel bearing
 Bent or loose wheel axle
 Excessive wheel runout
8. Frame
 Bent frame
 Damaged steering head pipe
 Improperly installed bearing race
EAS28710
FAULTY LIGHTING OR SIGNALING SYS-
TEM
Headlight does not come on
 Wrong headlight bulb
 Too many...

EAS28740
WIRING DIAGRAM
FZS6W/FZS6WC
1. Main switch
2. AC magneto
3. Rectifier/regulator
4. Backup fuse
5. Fuel injection system fuse
6. Main fuse
7. Starter relay
8. Starter motor
9. Battery
10. Starting circuit cut-off relay
11. Sidestand switch
12. Neutral switch
13. Fuel pump
14. Throttle position sensor
15. Intake air pressure sensor
16. O
2 sensor
17. Lean angle sensor
18. Crankshaft position sensor
19. Intake air temperature sensor
20. Coolant temperature sensor
21. ECU (engine control unit)
22....