2014 YAMAHA YZ450F wiring diagram

CHARGING SYSTEM
8-8
TROUBLE SHOOTING
The condenser is not being charged.
TIP
Before troubleshooting, remove the following part (s):
1. Seat
2. Air scoop (left)
1. Check the entire charging system’s
wiring.NG Reconnect.
OK 
2. Check the rectifier/regulator.
Refer to “CHECKING THE RECTI-
FIER/REGULATOR” on page 8-43.
NG 
Replace the rectifier/regulator.
OK 
3. Check the stator coil.
Refer to “CHECKING THE STA-
TOR COIL” on page 8-43.
NG 
Replace the stator coil.
OK 
4. Check the charging system wire
harness.
Refer to “CIRCUIT DIAGRAM” on
page 8-6.
NG 
Repair or replace the wire harness.
OK 
Replace the condenser.

ELECTRICAL COMPONENTS
8-40
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.
ECA14370
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 position).
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

EAS1SL1380
WIRING DIAGRAM
YZ450F 2014
1. Crankshaft position sensor
2. AC magneto
3. Rectifier/regulator
4. Joint connector
5. Condenser
6. Coupler for connecting option-
al part
7. Engine stop switch
8. Neutral switch
9. ECU
10. Ignition coil
11. Spark plug
12. Injector
13. Fuel pump
14. Intake air temperature sensor
15. Coolant temperature sensor
16. Throttle position sensor
17. Intake air puressure sensorEAS1SL1381COLOR CODE
BBlack
GyGray
LBlue
LgLight green
OOrange
PPink
RRed
SbSky blue
YYellow
B/LBlack/Blue
B/RBlack/Red
B/WBlack/White
B/YBlack/Yellow
Br/WBrown/White
G/WGreen/White
P/BPink/Black
R/BRed/Black

A
A
A
A
B
R R R R R R RB
B
B
R
RRLgLg
B/W
B/YB/Y
B
B
B
PPPSb
B/L
P/B
P/B
Y
L
Y
L
L
G/W
Br/W
G/W
Br/WB/L
B/L
B/L
B/L
B/RB/R
R/BR/B
O
O
R
O
R
O
R
R
R
Sb
B
Gy
R
B/W
P
LB/L
B/L Gy B/L B/L B/L B/L B/L
L L
P P
B B B B
4
1
32
5
\f
7
8
10
\b
12
11
13
14
15
1\f
17
P P
Sb
R B
B/RR
RB
B/LGyBR
B/Y PSb
B B
RR/B
L YB/L
B/W RLg
B/LBr/W
B/L P/B L
B/LG/W
BB/Y
B
B/L B/L B/L B/L B/L B/LB B B B R R
P P P L L LR R R R R
B
O P
Gy
R
B/Y SbP/B
R/B Lg B/RG/WBr/WB/L L Y
R BB/L
Gy
ROOR(BLACK) (BLACK)
B/W
WIRING DIAGRAM
YZ450F (E) 2014 SCHÉMA DE CÂBLAGE
YZ450F (E) 2014
SCHALTPLAN
YZ450F (E) 2014
1SL-28199-80_W.D.indd 12013/09/16 8:57:28

A
A
A
A
B
(BLACK) (BLACK)
4
1
32
5
6
7
8
10
9
12
11
13
14
15
16
17
WIRING DIAGRAM
YZ450F (E) 2014 SCHÉMA DE CÂBLAGE
YZ450F (E) 2014
SCHALTPLAN
YZ450F (E) 2014
1SL-28199-80_W.D.indd 22013/09/16 8:57:28