Yamaha YP250 5GM2-AE1 2000 Service Manual page 102

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5. Relay unit (fuel pump relay)
Disconnect the relay unit from the coupler.
Connect the pocket tester (Ω
tery (12 V) to the relay unit terminals as
shown.
Battery positive terminal ! red/white
Battery negative terminal ! blue/red
Tester positive probe ! red/white
Tester negative probe ! blue/black
Turn the main switch to on.
Check the starter relay for continuity.
6. Fuel pump resistance
Disconnect the fuel pump coupler from the
wire harness.
Connect the pocket tester (Ω
pump coupler (fuel pump side) as shown.
Tester positive probe ! black/blue
Tester negative probe ! black
Measure the fuel pump resistance.
Fuel pump resistance
13 Ω at 20_C
11
7. Wiring connection
Check the entire fuel pump system's wiring.
Refer to "CIRCUIT DIAGRAM".
Replace the ignition unit
1) and bat-
1
2
3
4
CONTINUITY
1) to the fuel
1
2
CORRECT
CORRECT
FUEL PUMP SYSTEM
NO CONTINUITY
Replace the starter relay
OUT OF SPECIFICATION
Replace the fuel pump
POOR CONNECTION
Correct.
92
ELEC