Yamaha 2002 TDM900 Service Manual page 443

EAS00803
6. The fuel level gauge fails to operate.
1. Fuel sender
S Drain the fuel from the fuel tank and remove
the fuel pump assembly from the fuel tank.
S Connect the pocket tester (Ω
sender as shown.
Positive tester probe ! green
Negative tester probe ! black/white
S Measure the fuel sender resistances.
NOTE:
Measure the resistances when the float arm
is in contact with the full position and empty
position of the stopper.
Fuel sender resistance
Full position of the float
19 X 21 Ω at 20_C
Empty position of the float
139 X 141 Ω at 20_C
S Is the fuel sender OK?
YES
2. Voltage
S Connect the pocket tester (DC V 20) to the
meter assembly (wire harness side) as
shown.
Positive tester probe ! green
Negative tester probe ! black/white
1) to the fuel
1
2
NO
Replace the fuel
pump.
1
2
8-43
SIGNALING SYSTEM
S Set the main switch to "ON".
S Measure the voltage (DC 12 V) of green
and black/white
coupler.
S Is the voltage within specification?
YES
3. Voltage
S Connect the pocket tester (DC 20 V) to the
meter assembly coupler as shown.
Tester positive probe ! brown
Tester negative probe ! black/white
S Set the main switch to "ON".
S Measure the voltage (12 V) of brown
black/white 2
pler.
S Is the voltage within specification?
YES
This circuit is OK.
ELEC
at the meter assembly
2
NO
The wiring
from the fuel sender
to the meter assem-
bly coupler is faulty
and must be re-
paired.
1
1
at the meter assembly cou-
NO
Replace the meter
assembly.
1
circuit
2
and