Checking The Horn; Checking The Fuel Sender; Checking The Fuel Level Warning Light - Yamaha MT-09 2021 Service Manual

Regulated voltage (DC)
14.3–14.7 V
a. Connect the digital circuit tester (DC V) to
the battery as shown.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with ta-
chometer
YU-A1927
• Positive tester probe →
Positive battery terminal
• Negative tester probe →
Negative battery terminal
b. Start the engine and let it run at approxi-
mately 5000 r/min.
c. Measure the charging voltage.
EAS30569

CHECKING THE HORN

1. Check:
• Horn sound
Faulty sound → Replace.
EAS30573

CHECKING THE FUEL SENDER

1. Disconnect:
• Fuel pump coupler
(from the fuel pump)
2. Remove:
• Fuel tank
3. Remove:
• Fuel pump
(from the fuel tank)
4. Check:
• Fuel sender resistance
Out of specification → Replace the fuel pump
assembly.
Sender unit resistance (full)
9.0–11.0 Ω
Sender unit resistance (empty)
213.0–219.0 Ω
a. Connect the digital circuit tester (Ω) to the
fuel sender terminals as shown.
ELECTRICAL COMPONENTS
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with ta-
chometer
YU-A1927
• Positive tester probe →
Fuel sender terminal "1"
• Negative tester probe →
Fuel sender terminal "2"
b. Move the fuel sender float to maximum "3"
and minimum "4" level position.
EAS30574
CHECKING THE FUEL LEVEL WARNING
LIGHT
This model is equipped with a self-diagnosis de-
vice for the fuel level detection circuit.
1. Check:
• Fuel level warning light "1"
(Turn the main switch to "ON".)
Warning light comes on for a few seconds,
then goes off → Warning light is OK.
Warning light does not come on → Replace
the meter assembly.
Warning light flashes eight times, then goes
off for 3 seconds in a repeated cycle (mal-
function detected in fuel sender) → Replace
the fuel pump assembly.
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