Yamaha MBK YQ100 Service Manual page 222

3. Voltage
• Connect the pocket tester (DC20V) to the
bulb socket connector
Pocket tester (+) lead → → → → → Grey
Pocket tester (-) lead → → → → → Black
• Turn the main switch to "CHECK"
• Check the voltage (12V) between "Grey"
and "Black"
This circuit is in good condition.
5.The fuel meter does not work.
1. Voltage
• Disconnect the fuel sender leads.
• Connect the pocket tester (Ω x 100) then
(Ωx10) to the fuel sender.
• Drain the fuel tank.
• Measure the resistance.
Sender unit resistance
(empty tank):
Ω
90 ~ 100
• Fill the tank
• Measure the resistance.
Sender unit resistance
(fuel tank):
Ω
1.5 ~ 7.5
This circuit is in good condition.
MEETS
SPECIFICATION
°
at 20 C
°
at 20 C
MEETS
SPECIFICATION
SIGNAL SYSTEM
B
G
LR
Y
Dg
Ch
Gy
Br
YR
OUT OF SPECIFICATION
6.Connections
• Check all connections in the signal system.
Refer to "WIRING DIAGRAM".
DOES NOT MEET SPECIFICATION
Replace the fuel sender.
7-35
ELEC
Br
L
12V 1.2W
J
H
I
12V 1.2W
B
B
12V 1.2W
K
Br
M
B