Yamaha YZ 2023 Series, Owner'S Service Manual

Page: 343 / 378

ELECTRICAL COMPONENTS
8-56
a. Set the digital tachometer to the ignition
coil.
b. Connect the digital circuit tester (DCV) to
the rectifier/regulator coupler.
c. Start the engine and let it run at about
5000 r/min.
d. Measure the output voltage.
EAM30359
CHECKING THE FUEL SENDER
1. Disconnect:
• Starter motor lead
(from the starter relay)
2. Connect:
•
Fuel pump coupler
3. Push the start switch.
4. Check:
• Fuel level warning light
Out of specification

Replace the fuel
pump.
EAM30360
CHECKING THE RESISTOR
1. Disconnect:
• Resistor coupler
(from the wire harness)
2. Check:
•
Resistor resistance
Out of specification

Replace the resistor.
a. Connect the digital circuit tester (

) to the
resistor as shown.
b. Measure the resistance of the resistor.
Regulated voltage (DC)
14.0–14.8 V
Digital tachometer
90890-06760
Digital tachometer
YU-39951-B
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
• Positive tester probe

Red “1”
• Negative tester probe

Black “2”
2 1
B
W W
R
Fuel pump is atmosphere “A”
 Fuel level warning light comes on
Fuel pump is soaked in fuel “B”
 Fuel level warning light goes off
Resistor resistance
64.6–71.4

Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
• Positive tester probe

Black “1”
• Negative tester probe

Black “2”
1
2