Yamaha TDM850'99 4TX-AE3 Service Manual page 36

S Is the fuel sender OK?
YES
3. Fuel meter
S Drain the fuel and remove the fuel sender from
the fuel tank.
S Connect the fuel sender to wireharness.
S Move the float to "UP"
S Turn the main switch to "ON".
S Check the fuel gauge needle moves "F" or "E".
Float position
1
Float "UP"
Float "DOWN" 2
YES
4. Voltage
Connect the pocket tester (DC 20 V) to the meter
assembly coupler (wire harness side) as shown.
Tester positive probe ! Brown
Tester negative probe ! Green/Red
NO
Replace the fuel
sender.
1
or "DOWN" .
2
Needle moves
"F"
"E"
NO
Replace the fuel meter
1
2
SIGNAL SYSTEM
S Set the main switch to "ON".
S Measure the voltage (12 V).
S Is the voltage within specification?
YES
This circuit is OK.
2. The speed meter fails to operate.
1. Speed sensor
S Connect the pocket tester (DC 20 V) and bat-
tery (12 V)to the speed sensor coupler as
shown.
S Speed sensor coupler (speed sensor side)
–30–
ELEC
NO
The wiring circuit from
the main switch to the
meter assembly cou-
pler is faulty and must
be repaired.