Yamaha TDM850'99 4TX-AE3 Service Manual page 41

5. Fuel pump relay
S Disconnect the relay unit from the coupler.
S Connect the pocket tester (Ω
(12 V) to the relay unit ferminals as shown.
Battery positive terminal ! red/black
Battery negative terminal ! blue/red
Tester positive probe ! red/black
Tester negative probe ! blue/black
S Does the fuel pump relay have continuity be-
tween red/black and blue/black?
YES
EB808400
6. Fuel pump resistance
S Disconnect the fuel pump coupler from the
wire harness.
S Connect the pocket tester (Ω
pump coupler (fuel pump side) as shown.
Tester positive probe ! black/blue
Tester negative probe ! black
1) and battery
1
2
1
3
NO
Replace the relay unit
1) to the fuel
1
2
FUEL PUMP SYSTEM
S Measure the fuel pump resistance.
Fuel pump resistance
4 X 10 Ω at 20_C
S Is the fuel pump OK?
EB808401
7. Wiring
S Check the entire fuel pump system's wiring.
Refer to "CIRCUIT DIAGRAM".
S Is the fuel pump system's wiring properly con-
nected and without defects?
Replace the ignitor
unit.
–35–
ELEC
YES
Relpace the fuel pump.
YES
Prperly connect or re-
pair the fuel pump
system's wiring.
NO
NO