Yamaha FZ09E 2014, Service Manual, Page: 448 / 468

TROUBLESHOOTING
9-1
EAS28451
TROUBLESHOOTING
EAS28460
GENERAL INFORMATION
TIP
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.
EAS30410
STARTING FAILURES
Engine
1. Cylinder(s) and cylinder head(s)
•
Loose spark plug
• Loose cylinder head or cylinder
•
Damaged cylinder head gasket
• Worn or damaged cylinder
•
Incorrect valve clearance
• Improperly sealed valve
•
Incorrect valve-to-valve-seat contact
• Incorrect valve timing
•
Faulty valve spring
• Seized valve
2. Piston(s) and piston ring(s)
• Improperly installed piston ring
•
Damaged, worn or fatigued piston ring
• Seized piston ring
•
Seized or damaged piston
3. Air filter
•
Improperly installed air filter
• Clogged air filter element
4. Crankcase and crankshaft
• Improperly assembled crankcase
•
Seized crankshaft
Fuel system
1. Fuel tank
• Empty fuel tank
•
Clogged fuel tank cap breather hole
• Deteriorated or contaminated fuel
•
Clogged or damaged fuel hose
2. Fuel pump
•
Faulty fuel pump
• Faulty fuel pump relay
3. Throttle body (-ies)
• Deteriorated or contaminated fuel
•
Sucked-in air
Electrical system
1. Battery
• Discharged battery
•
Faulty battery
2. Fuse(s)
• Blown, damaged or incorrect fuse
•
Improperly installed fuse
3. Spark plug(s)
•
Incorrect spark plug gap
• Incorrect spark plug heat range
•
Fouled spark plug
• Worn or damaged electrode
•
Worn or damaged insulator
4. Ignition coil(s)
•
Cracked or broken ignition coil body
• Broken or shorted primary or secondary coils
5. Ignition system
• Faulty ECU
•
Faulty crankshaft position sensor
• Broken generator rotor woodruff key
6. Switches and wiring
• Faulty main switch
•
Faulty start/engine stop switch
• Broken or shorted wiring
•
Faulty gear position sensor
• Faulty sidestand switch
•
Faulty clutch switch
• Improperly grounded circuit
•
Loose connections
7. Starting system
•
Faulty starter motor
• Faulty starter relay
•
Faulty starting circuit cut-off relay
• Faulty starter clutch
EAS30430
INCORRECT ENGINE IDLING SPEED
Engine
1. Cylinder(s) and cylinder head(s)
•
Incorrect valve clearance
• Damaged valve train components
2. Air filter
• Clogged air filter element
Fuel system
1. Throttle body (-ies)
•
Damaged or loose throttle body joint
• Improperly synchronized throttle bodies
•
Improper throttle grip 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