Troubleshooting; General Information; Starting Failures; Incorrect Engine Idling Speed - Yamaha 2009 Diversion XJ6S Service Manual

EAS28450

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.
EAS28470

STARTING FAILURES

Engine
1. Cylinder(s) and cylinder head(s)
Loose spark plug
G
Loose cylinder head or cylinder
G
Damaged cylinder head gasket
G
Damaged cylinder gasket
G
Worn or damaged cylinder
G
Incorrect valve clearance
G
Improperly sealed valve
G
Incorrect valve-to-valve-seat contact
G
Incorrect valve timing
G
Faulty valve spring
G
Seized valve
G
2. Piston(s) and piston ring(s)
Improperly installed piston ring
G
Damaged, worn or fatigued piston ring
G
Seized piston ring
G
Seized or damaged piston
G
3. Air filter
Improperly installed air filter
G
Clogged air filter element
G
4. Crankcase and crankshaft
Improperly assembled crankcase
G
Seized crankshaft
G
Fuel system
1. Fuel tank
Empty fuel tank
G
Clogged fuel filter
G
Clogged fuel tank drain hose
G
Deteriorated or contaminated fuel
G
2. Fuel pump
Faulty fuel pump
G
Faulty fuel injection system relay
G
3. Throttle body(-ies)
Deteriorated or contaminated fuel
G
Sucked-in air
G
Electrical system
1. Battery
Discharged battery
G
TROUBLESHOOTING
Faulty battery
G
2. Fuse(s)
Blown, damaged or incorrect fuse
G
Improperly installed fuse
G
3. Spark plug(s)
Incorrect spark plug gap
G
Incorrect spark plug heat range
G
Fouled spark plug
G
Worn or damaged electrode
G
Worn or damaged insulator
G
Faulty spark plug cap
G
4. Ignition coil(s)
Cracked or broken ignition coil body
G
Broken or shorted primary or secondary coils
G
Faulty spark plug lead
G
5. Ignition system
Faulty ECU
G
Faulty crankshaft position sensor
G
6. Switches and wiring
Faulty main switch
G
Faulty engine stop switch
G
Broken or shorted wiring
G
Faulty neutral switch
G
Faulty start switch
G
Faulty sidestand switch
G
Faulty clutch switch
G
Improperly grounded circuit
G
Loose connections
G
7. Starting system
Faulty starter motor
G
Faulty starter relay
G
Faulty starting circuit cut-off relay
G
Faulty starter clutch
G
EAS28490

INCORRECT ENGINE IDLING SPEED

Engine
1. Cylinder(s) and cylinder head(s)
Incorrect valve clearance
G
Damaged valve train components
G
2. Air filter
Clogged air filter element
G
Fuel system
1. Throttle body(-ies)
Damaged or loose throttle body joint
G
Improperly synchronized throttle bodies
G
Improperly adjusted engine idling speed (idle
G
adjusting screw)
Improper throttle cable free play
G
Flooded throttle body
G
Faulty air induction system
G
Electrical system
1. Battery
Discharged battery
G
9-1