Yamaha Scorpio Service Manual page 252

5.Fuel meter does not operate.
1.Fuel sender
Remove the fuel sender 1 from the fuel
G
tank.
Connect the pocket tester to the fuel
G
sender coupler.
Tester (+) lead → Green 2 terminal
Tester (–) lead → Black 3 terminal
Check the fuel sender for the specified
G
resistance.
Fuel sender resistance (Up 4):
(Ω × 1)
4 ~ 10 Ω at 20°C
Fuel sender resistance (Down 5):
(Ω × 10)
90 ~ 100 Ω at 20°C
2.Voltage
Connect the pocket tester (DC 20 V) to the
G
fuel meter coupler.
Tester (+) lead → Brown 1 terminal
Tester (–) lead → Black 2 terminal
Turn the main switch to "ON".
G
Check for voltage (12 V) on the "Brown"
G
lead at the fuel meter coupler.
BOTH MEET
SPECIFICATION
MEETS SPECIFI-
CATION (12 V)
*
SIGNALING SYSTEM
OUT OF SPECIFICATION
Replace fuel sender.
OUT OF SPECIFICATION
Check the entire signal system for connec-
tions.
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– +
ELEC