Yamaha TMAX XP530E-A 2017, Service Manual

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TROUBLESHOOTING
9-1
EAS20090
TROUBLESHOOTING
EAS30599
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.
EAS31258
STARTING FAILURE/HARD STARTING
Engine
1. Cylinder(s) and cylinder head
• 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 rollover valve
• Clogged fuel tank breather hose
•
Deteriorated or contaminated fuel
• Clogged or damaged fuel hose
2. Fuel pump
• Faulty fuel pump
•
Faulty fuel injection system relay
• Damaged vacuum hose
•
Improperly routed hose
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
•
Cracked or broken ignition coil body
• Broken or shorted primary or secondary coils
•
Faulty spark plug lead
5. Ignition system
•
Faulty ECU (engine control unit)
• Faulty crankshaft position sensor
•
Broken generator rotor woodruff key
6. Switches and wiring
•
Faulty engine stop switch
• Broken or shorted wiring
•
Faulty front, rear or both brake light switches
• Faulty ON/start switch
•
Faulty sidestand switch
• Improperly grounded circuit
•
Loose connections
7. Starting system
•
Faulty starter motor
• Faulty starter relay
•
Faulty starting circuit cut-off relay
• Faulty starter clutch
EAS30601
INCORRECT ENGINE IDLING SPEED
Engine
1. Cylinder(s) and cylinder head
•
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
• Improperly adjusted engine idling speed (idle
adjusting screw)
• Improper throttle grip free play
•
Flooded throttle body