Yamaha MBK MW125 2014, Service Manual

Page: 356 / 380

ELECTRICAL COMPONENTS
8-59
Checking the condition of the bulb sockets
The following procedure applies to all of the bulb
sockets.
1. Check:
• Bulb socket (for continuity)
(with the pocket tester)
No continuity
→
Replace.
TIP
Check each bulb socket for continuity in the
same manner as described in the bulb section;
however, note the following.
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a. Install a good bulb into the bulb socket.
b. Connect the pocket tester probes to the re-
spective leads of the bulb socket.
c. Check the bulb socket for continuity. If any of
the readings indicate no continuity, replace
the bulb socket.
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EAS30551
CHECKING THE FUSES
The following procedure applies to all of the fus-
es.
NOTICE
ECA20520
To avoid a short circuit, always turn the main
switch to “OFF” when checking or replacing
a fuse.
1. Remove:
• Right upper inner panel
Refer to “GENERAL CHASSIS (2)” on page
4-3.
2. Check:
• Fuse
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a. Connect the pocket tester to the fuse and
check the continuity.
TIP
Set the pocket tester selector to “
Ω ×
1”.
b. If the pocket tester indicates “
∞
”, replace the
fuse.
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3. Replace:
• Blown fuse
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a. Turn the main switch to “OFF”.
b. Install a new fuse of the correct amperage
rating.
c. Set on the switches to verify if the electrical
circuit is operational.
d. If the fuse immediately blows again, check
the electrical circuit.
WARNING
EWA13310
Never use a fuse with an amperage rating
other than that specified. Improvising or us-
ing a fuse with the wrong amperage rating
may cause extensive damage to the electri-
cal system, cause the lighting and ignition
systems to malfunction and could possibly
cause a fire.
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4. Install:
• Right upper inner panel
Refer to “GENERAL CHASSIS (2)” on page
4-3.
EAS31006
REPLACING THE ECU (engine control unit)
1. Turn the main switch to “OFF”.
2. Replace the ECU (engine control unit).
3. Clean the throttle bodies.
Refer to “CLEANING THE ISC (IDLE SPEED
CONTROL) UNIT AND THROTTLE BODY”
on page 7-9.
4. Check:
• Engine idling speed
Start the engine, warm it up, and then mea-
sure the engine idling speed.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Fuses
Amperage
rating
Q’ty
Main 20 A 1
Headlight 15 A 1
Signaling system 10 A 1
Backup 10 A 1
Spare 20 A 1
Spare 15 A 1
Spare 10 A 1