Yamaha Fz6n Manual

8-53
SELF-DIAGNOSISELEC
Repair or replace the
wire harness.
NO
1. Wire harness

Check the wire harness for continuity.
Refer to “CIRCUIT DIAGRAM”.

Is the wire harness OK?
YES
NO
2. Fuel pump thermistor

Check the fuel pump thermistor for continuity.
Refer to “The fuel level indicator light fails to
come on”.

Is the fuel pump thermistor OK?
YES
Replace the fuel
pump.Replace the multi-
function meter.
NOTE:
13Fuel pump
34Multi-function meter
TROUBLESHOOTING
The warning light starts to indicate the...

8-54
SELF-DIAGNOSISELEC
Replace the oil level
switch.
NO
2. Oil level switch

Check the oil level switch for continuity.
Refer to “The oil level warning light fails to
come on”.

Is the oil level switch OK?
YES
Repair or replace the
wire harness.
NO
1. Wire harness

Check the wire harness for continuity.
Refer to “CIRCUIT DIAGRAM”.

Is the wire harness OK?
YES
Replace the multi-
function meter.
34Multi-function meter
37Oil level switch
2. Oil level switch
CIRCUIT DIAGRAM 

9-1
9
STARTING FAILURES
TRBL
SHTG
NOTE:
Air filter

Improperly installed air filter

Clogged air filter element
Crankcase and crankshaft

Improperly assembled crankcase

Seized crankshaft
FUEL SYSTEM
Fuel tank

Empty fuel tank

Clogged fuel filter

Clogged fuel tank drain hose

Deteriorated or contaminated fuel
Fuel pump

Faulty fuel pump

Faulty fuel pump relay
Throttle body(-ies)

Deteriorated or contaminated fuel

Sucked-in air
Ignition coil(s)

Cracked or broken ignition coil body

Broken or shorted...

9-2
STARTING FAILURE / INCORRECT ENGINE IDLING SPEED /
POOR MEDIUM-AND-HIGH-SPEED PERFORMANCETRBL
SHTG
Starting system

Faulty starter motor

Faulty starter relay

Faulty starting circuit cut-off relay

Faulty starter clutch
ELECTRICAL SYSTEMS
Battery

Discharged battery

Faulty battery
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
Ignition coil(s)

Broken or shorted primary or...

9-3
FAULTY GEAR SHIFTING / FAULTY CLUTCH
TRBL
SHTG
JUMPS OUT OF GEAR
Shift shaft

Incorrect shift pedal position

Improperly returned stopper lever
Shift forks

Worn shift fork
Shift drum

Incorrect axial play

Worn shift drum groove
Transmission

Worn gear dog
CLUTCH DRAGS
Clutch

Unevenly tensioned clutch springs

Warped pressure plate

Bent clutch plate

Swollen friction plate

Bent clutch push rod

Damaged clutch boss

Burnt primary driven gear bushing

Match marks not aligned
Engine oil

Incorrect...

9-4
OVERHEATING / OVERCOOLING /
POOR BRAKING PERFORMANCETRBL
SHTG
FUEL SYSTEM
Throttle body(-ies)

Damaged or loose carburetor joint
Air filter

Clogged air filter element
CHASSIS
Brake(s)

Dragging brake
ELECTRICAL SYSTEMS
Spark plug(s)

Incorrect spark plug gap

Incorrect spark plug heat range
Ignition system

Faulty ECU
Cooling system

Faulty radiator fan motor relay

Faulty coolant temperature sensor

Faulty ECU
EAS00855
OVERHEATING
ENGINE
Clogged coolant passages

Cylinder head(s) and piston(s)...

9-5
FAULTY FRONT FORK LEGS / UNSTABLE HANDLING
TRBL
SHTG
Rear shock absorber assembly(-ies)

Faulty rear shock absorber spring

Leaking oil or gas
Tire(s)

Uneven tire pressures (front and rear)

Incorrect tire pressure

Uneven tire wear
Wheel(s)

Incorrect wheel balance

Deformed cast wheel

Damaged wheel bearing

Bent or loose wheel axle

Excessive wheel runout
Frame

Bent frame

Damaged steering head pipe

Improperly installed bearing race
EAS00861
FAULTY FRONT FORK LEGS
LEAKING OIL

Bent, damaged or...

9-6
FAULTY LIGHTING OR SIGNALING SYSTEM
TRBL
SHTG
TURN SIGNAL DOES NOT COME ON

Faulty turn signal switch

Faulty turn signal relay

Burnt-out turn signal bulb

Incorrect connection

Damaged or faulty wire harness

Improperly grounded circuit

Faulty battery

Blown, damaged or incorrect fuse
TURN SIGNAL BLINKS SLOWLY

Faulty turn signal relay

Faulty main switch

Faulty turn signal switch

Incorrect turn signal bulb
TURN SIGNAL REMAINS LIT

Faulty turn signal relay

Burnt-out turn signal bulb
TURN SIGNAL...

56Hazard switch
57Turn signal switch
58Horn switch
59Horn
60Dimmer relay
61Headlight (high beam)
62Headlight (low beam)
63Rear turn signal light (right)
64Rear turn signal light (left)
65Front turn signal / position light (right)
66Front turn signal / position light (left)
1Main switch
2A.C. magneto
3Rectifier / regulator
4Fuse (backup)
5Fuse (fuel injection)
6Fuse (main)
7Starter relay
8Starter motor
9Battery
10Starting circuit cut-off relay
11Sidestand switch
12Neutral switch
13Fuel pump
14Throttle...