TROUBLESHOOTING
8-1
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
• Loose cylinder head or cylinder
• Damaged cylinder head gasket
• Damaged cylinder 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 filter
• Clogged fuel tank breather hose
• Clogged rollover valve
• Deteriorated or contaminated fuel
2. Fuel pump
• Faulty fuel pump
• Faulty relay unit (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
• Faulty spark plug cap
4. Ignition coil(s)
• Cracked or broken ignition coil body
• Broken or shorted primary or secondary coils
• Faulty spark plug lead
5. Ignition system
• Faulty ECU
• Faulty crankshaft position sensor
• Broken generator rotor Woodruff key
6. Switches and wiring
• Faulty main switch
• Faulty engine stop switch
• Broken or shorted wiring
• Faulty neutral switch
• Faulty start switch
• Faulty sidestand switch
• Faulty clutch switch
• Improperly grounded circuit
• Loose connections
7. Starting system
• Faulty starter motor
• Faulty starter relay
• Faulty relay unit (starting circuit cut-off relay)
• Faulty starter clutch
EAS28490
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
Summary of Contents for XVS950CU 2014
Page 1: ...2014 SERVICE MANUAL XVS950CU XVS950CUE 1XC 28197 E0...
Page 6: ......
Page 8: ......
Page 73: ...LUBRICATION POINTS AND LUBRICANT TYPES 2 30...
Page 76: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 33 EAS20410 LUBRICATION DIAGRAMS...
Page 78: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 35...
Page 79: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 36 1 Camshaft 2 Crankshaft...
Page 80: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 37...
Page 81: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 38 1 Oil drain bolt 2 Crankshaft...
Page 82: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 39...
Page 100: ...CABLE ROUTING except for ABS models 2 57 Spark plug lead B A 2 2 1 1 C F 3 4 5 6 7 8 10 D E 9...
Page 112: ...CABLE ROUTING except for ABS models 2 69 Fuel tank breather hose right side view 1 2 3 A B...
Page 114: ...CABLE ROUTING except for ABS models 2 71 Intake air pressure sensor hose top view 1 B C 2 A...
Page 132: ...CABLE ROUTING for ABS models 2 89 Front brake hose front and right side view 1 A B 1 1 1 2 C D...
Page 138: ...CABLE ROUTING for ABS models 2 95 Spark plug lead 3 3 4 4 5 6 7 8 9 10 11 12 C D A B 1 1 2 2...
Page 150: ...CABLE ROUTING for ABS models 2 107 Fuel tank breather hose right side view 1 2 3 A B...
Page 152: ...CABLE ROUTING for ABS models 2 109 Intake air pressure sensor hose top view 1 B C 2 A...
Page 156: ...CABLE ROUTING for ABS models 2 113...
Page 159: ......
Page 288: ...BELT DRIVE 4 97...
Page 293: ...ENGINE INSPECTION 5 2 10 Install Rear cylinder right cover Refer to ENGINE REMOVAL on page 5 3...
Page 399: ...IGNITION SYSTEM 7 8...
Page 407: ...ELECTRIC STARTING SYSTEM 7 16...
Page 413: ...CHARGING SYSTEM 7 22...
Page 429: ...SIGNALING SYSTEM 7 38...
Page 481: ...FUEL INJECTION SYSTEM 7 90...
Page 487: ...FUEL PUMP SYSTEM 7 96...
Page 499: ...IMMOBILIZER SYSTEM 7 108...
Page 537: ...ABS ANTI LOCK BRAKE SYSTEM for ABS models 7 146...
Page 540: ...ELECTRICAL COMPONENTS 7 149 1 2 5 7 10 8 9 6 16 15 14 13 4 3 11 12...
Page 574: ......
Page 575: ......
Page 576: ......