Fuel Pump Coupler - Yamaha YZF-R1P Service Manual

EAS00759
5. Starting circuit cut-off relay
• Disconnect the starting circuit cut-off relay
coupler from the wire harness.
• Connect the pocket tester (Ω × 1) and bat-
tery (12 V) to the starting circuit cut-off
relay coupler as shown.
Positive battery lead → red/black 1
Negative battery lead → blue/yellow 2
Positive tester probe → red 3
Negative tester probe → red/blue 4
• Does the starting circuit cut-off relay have
continuity between red and red/blue?
YES
FUEL PUMP SYSTEM
NO
Replace the starting
circuit cut-off relay.
8 - 48
EAS00817
6. Fuel pump resistance
• Disconnect the fuel pump coupler from the
wire harness.
• Connect the pocket tester (Ω × 1) to the
fuel pump coupler as shown.
Positive tester probe → red/blue 1
Negative tester probe → black 2
• Measure the fuel pump resistance.
Fuel pump resistance
0.2 ~ 3.0 Ω at 20 °C (68 °F)
• Is the fuel pump OK?
YES
EAS00818
7. Wiring
• Check the entire fuel pump system's wir-
ing.
Refer to "CIRCUIT DIAGRAM".
• Is the fuel system's wiring properly con-
nected and without defects?
YES
Replace the ECU.
– +
ELEC
NO
Replace the fuel
pump.
NO
Properly connect or
repair the fuel sys-
tem's wiring.