Yamaha YXR70FX Service Manual page 482

4. Fuel injection system relay
• Remove the fuel injection system relay
from the wire harness.
• Connect the pocket tester (Ω × 1) and bat-
tery (12 V) to the fuel injection system
relay terminal as shown.
• Check the fuel injection system relay of
continuity.
Positive battery lead → brown/red 1
Negative battery lead → blue/red 2
Positive tester probe → brown/black 3
Negative tester probe → red/blue 4
• Does the fuel injection system relay have
continuity between brown/black and red/
blue?
YES
FUEL PUMP SYSTEM
NO
Replace the fuel
injection system
relay.
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5. Fuel pump
• Check the condition of the fuel pump.
Refer to "CHECKING THE FUEL PUMP
BODY" in chapter 6.
YES
6. Wiring
• Check the entire fuel pump system wiring.
Refer to "CIRCUIT DIAGRAM".
• Is the fuel pump system wiring properly
connected and without defects?
YES
Replace the ECU.
– +
ELEC
NO
Replace the fuel
pump assembly.
NO
Properly connect or
repair the fuel pump
system wiring.