Yamaha YZF-R1S Service Manual page 444

EAS00759
5. Starting circuit cut-off relay (fuel injection
system relay)
S Disconnect the starting circuit cut-off relay
coupler from the wire harness.
S Connect the pocket tester (Ω
tery (12 V) to the starting circuit cut-off relay
coupler as shown.
Positive battery lead ! red/black
Negative battery lead ! blue/yellow
Positive tester probe ! red
Negative tester probe ! red/blue
S Does the starting circuit cut-off relay have
continuity between red and red/blue?
YES
FUEL PUMP SYSTEM
1) and bat-
1
2
3
4
NO
Replace the starting
circuit cut-off relay.
8-51
EAS00817
6. Fuel pump resistance
S Disconnect the fuel pump coupler from the
wire harness.
S Connect the pocket tester (Ω
pump coupler as shown.
Positive tester probe ! red/blue
Negative tester probe ! black
S Measure the fuel pump resistance.
Fuel pump resistance
0.2 X 3.0 Ω at 20_C (68_F)
S Is the fuel pump OK?
YES
EAS00818
7. Wiring
S Check the entire fuel pump system's wiring.
Refer to "CIRCUIT DIAGRAM".
S Is the fuel system's wiring properly con-
nected and without defects?
YES
Replace the ECU.
ELEC
1) to the fuel
1
2
NO
Replace the fuel
pump.
NO
Properly connect or
repair the fuel sys-
tem's wiring.