2017 YAMAHA WR 250F wiring

ELECTRICAL COMPONENTS
9-66
Check each switch for continuity with the pocket tester. If the continuity reading is incorrect, check
the wiring connections and if necessary, replace the switch.
ECA
NOTICE
Never insert the tester probes into the coupler terminal slots “1”. Always insert the probes
from the opposite end of the coupler, taking care not to loosen or damage the leads.
TIP
• Before checking for continuity, set the pocket tester range to “ 1” to make a “0” adjustment.
• When checking for continuity, switch back and forth between the switch positions a few times.
Terminal connections of the switch are shown in the terminal connection diagram below.
The switch positions “a” are shown in the far left column and the switch lead colors are shown in the
top row in the switch illustration.
TIP
“ ” indicates continuity between switch terminals (i.e., a closed circuit at each switch posi-
tion).
The example illustration below shows that:
There is continuity between red and brown when the switch is “ON”.Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
a

TROUBLESHOOTING
10-1
EAS2GBB405
TROUBLESHOOTING
EAS2GBB406GENERAL 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
troubleshooting. Refer to the relative procedure
in this manual for checks, adjustments, and re-
placement of parts.
EAS2GBB407STARTING FAILURES
Engine
1. Cylinder 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 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 breather hose
• Deteriorated or contaminated fuel
• Clogged or damaged fuel hose
2. Fuel pump
• Faulty fuel pump
3. Throttle body
• Deteriorated or contaminated fuel
• Sucked-in airElectrical system
1. Battery
• Discharged battery
• Faulty battery
2. Fuse
• Blown, damaged or incorrect fuse
• Improperly installed fuse
3. Spark plug
• Incorrect spark plug gap
• Incorrect spark plug heat range
• Fouled spark plug
• Worn or damaged electrode
• Worn or damaged insulator
4. Ignition coil
• 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 ECU
• Faulty engine stop switch
• Broken or shorted wiring
• Faulty neutral switch
• Improperly grounded circuit
• Loose connections
7. Starting system
• Faulty starter motor
• Faulty starter relay
• Faulty starting circuit cut-off relay
• Faulty starter clutch
EAS2GBB408INCORRECT ENGINE IDLING SPEED
Engine
1. Cylinder and cylinder head
• Incorrect valve clearance
• Damaged valve train components
2. Air filter
• Clogged air filter element
Fuel system
1. Throttle body
• Damaged or loose throttle body joint
• Improperly synchronized throttle bodies
• Improper throttle cable free play
• Flooded throttle body

EAS2GBB426
WIRING DIAGRAM
WR250F/WR250FH 2017
1. Joint connector
2. Joint connector
3. Joint connector
4. AC magneto
5. Rectifier/regulator
6. Headlight relay
7. Main relay
8. Engine ground
9. Battery
10. Frame ground
11. Starter relay
12. Main fuse
13. Starter motor
14. Starter relay diode
15. Indicator light
16. Engine trouble warning light
17. Fuel level warning light
18. Resistor
19. Fuel sender
20. Diode
21. Coupler for connecting option-
al part
22. ECU (engine control unit)
23. Ignition coil
24. Spark plug
25. Injector
26. Fuel pump
27. Radiator fan motor relay
28. Radiator fan motor fuse
29. Radiator fan motor
30. Joint connector
31. Intake air temperature sensor
32. Coolant temperature sensor
33. Throttle position sensor
34. Intake air pressure sensor
35. Lean angle sensor
36. Engine stop switch
37. Neutral switch
38. Diode
39. Starting circuit cut-off relay
40. Clutch switch
41. Start switch
42. Joint connector
43. Taillight
44. Headlight
45. Coupler for connecting option-
al switch
46. Speed sensor
47. Multi-function display
48. Frame ground
49. Ignition coil sub-lead
50. Negative battery lead
EAS2GBB427
COLOR CODE
BBlack
Br Brown
Ch Chocolate
Dg Dark green
G Green
Gy Gray
LBlue
Lg Light green
O Orange
PPink
RRed
Sb Sky blue
WWhite
Y Yellow
B/L Black/Blue
B/O Black/Orange
B/W Black/White
B/Y Black/Yellow
Br/W Brown/White
G/B Green/Black
G/W Green/White
G/Y Green/Yellow
L/B Blue/Black
L/G Blue/Green
L/R Blue/Red
L/W Blue/White
L/Y Blue/Yellow
P/L Pink/Blue
R/B Red/Black
R/L Red/Blue
R/W Red/White
R/Y Red/Yellow
W/B White/Black
Y/B Yellow/Black
Y/G Yellow/Green
Y/R Yellow/Red

ONOFF
ONOFF
BBBBBBRRRRRR/LBrBrBrBrBr
BrBr
BrBrBrBr
R/LR/LR/LR/LR/L
B
L
L
L
PP
L
YY
RR
Br
R/LR/LR/L
P/LP/L
R/L
R/L
R/L
R/BR/BL/R
L/YL/Y
Y/R
Y/R
G/Y
G/YG/YG/Y
B/YB/Y
R/L
B/L
B/L
B/L
B/L
B/LY/GY/G
B/L
B/O
L/B
Y/B
W/B
W/BG/BL/B
W/B
W/B
L/BL/B
L/GL/W
L/W
L/R
Br/W
Br/W
R/W
R/W
R/Y
R/Y
G/BG/B
G/B
B/O
B/LB/LB/L
B/LB/LB/LB/L
G/WG/W
Br/WBr/W
R/WR/WBr
OOO
R
R
Gy
LLLL
BBBB
B
BB
B
BB
B
B
B
R
R
W
W
Y
Y
Dg
Dg
Ch
Ch
RW
BrBrBrBr
Br
BWSb
SbSb
Sb
Br
BrB
Br
LgLgR/L
R
R
RR
Gy
B
BWWW
WWW
R
RR
G
G
BB
B
Y/B
R
B
BB
B
B
Br
Br
Br
B
L/G
B/L
B/W
B/W
B
BBB
BBBRR R
RRR/LBr BrBr
Br Br
(Gy)
(Gy)B/LGy
WW WB
Gy
B
R
WW W
BR
R,R/Y
G
R
Y/B
R,R/W
Br
R
L/R
(B)
R/YR/WBr/WL/G
Br/W ,Br
L/W
(B)
(B) Br
BrL/Y
Y/R
G/YBr
BB
BrBrL/YY/W
(B) (B)B B
GG/Y
RR/LR
LgW/B
(B)
BG
yBrR
W/BB/LLY PG/WB/YR/BLgG/YWBr/WOL/RY/BB/OL/BSbY/R
L/YP /LY/G
(Gy)R/LR/B
R/LB/Y
R/WR/L
R/W, BrP/L
R/LR /L(B)
(B) (B)
(L)
(L) (B)
BR/L
LB
R/LR
/LR/LR /LR/LB /LB/LB /LB/LB /LB/LB /LLLLL BBBBBrBrBrBr
B/LBr/W
B/LG/W
LYB/L
B/LPL
B/LY/GL
(B)
(B)B/OB
B
B
SbW/BSb
SbG/B
L/G,L/W
L/BBrG/B
G/BBBB
(B)
(B)L/BB
B
BBr Br
Br Br
Br
B
B
LY
(B)
(B)
(B)
(B)
(B)
GB
Ch
Dg
Y
BBR W
Br
R
B
W
B/WR
WCh DgYB
BrR/WBW
R
O
OR/L
BB
WR250F/WR250FH 2017
WIRING DIAGRAMWR250F/WR250FH 2017
SCHÉMA DE CÂBLAGE
2GB-28199-72_W.D.indd 12016/03/24 9:14:24

ONOFF
ONOFF
(Gy)
(Gy)
(B)
(B)
(B)
(B) (B)
(B)
(Gy)
(B)
(B) (B)
(L)
(L) (B)
(B)
(B)
(B)
(B)
(B)
(B)
(B)
(B)
(B)
,
,
,
,
,
WR250F/WR250FH 2017
WIRING DIAGRAMWR250F/WR250FH 2017
SCHÉMA DE CÂBLAGE
2GB-28199-72_W.D.indd 22016/03/24 9:14:24