Checking The Fuel Sender; Checking The Resistor - Yamaha YZ 2023 Series Owner's Service Manual

Regulated voltage (DC)
14.0–14.8 V
a. Set the digital tachometer to the ignition
coil.
Digital tachometer
90890-06760
Digital tachometer
YU-39951-B
b. Connect the digital circuit tester (DCV) to
the rectifier/regulator coupler.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
• Positive tester probe 
Red "1"
• Negative tester probe 
Black "2"
W W
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.
B R
2 1
8-56
ELECTRICAL COMPONENTS
Fuel pump is atmosphere "A"
 Fuel level warning light comes on
Fuel pump is soaked in fuel "B"
 Fuel level warning light goes off
EAM30360

CHECKING THE RESISTOR

1. Disconnect:
• Resistor coupler
(from the wire harness)
2. Check:
• Resistor resistance
Out of specification  Replace the resistor.
Resistor resistance
64.6–71.4 
a. Connect the digital circuit tester () to the
resistor as shown.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
• Positive tester probe 
Black "1"
• Negative tester probe 
Black "2"
b. Measure the resistance of the resistor.
1
2