Yamaha XP500 Service Manual page 466

Fault code No. 43
Used diagnostic code No. 09 (fuel system voltage)
Order Inspection operation item and
probable cause
1 Malfunction in ECU (engine)
2 Open or short circuit in the wiring
harness.
3 Malfunction or open circuit in fuel
injection system relay
4 Connected condition of connector
Inspect the coupler for any pins
that may have pulled out.
Check the locking condition of the
coupler.
FUEL INJECTION SYSTEM
Symptom The ECU (engine) is unable to monitor the battery voltage.
Operation item and countermeasure
Fuel injection system relay is on.
Repair or replace if there is an open or short circuit.
Between starting circuit cut-off relay (fuel injection
system relay), fuel pump, fuel injector (#1, #2)
red/blue – red/blue
Replace if defective.
1. Disconnect the fuel injection system relay from
the wire harness.
2. Connect the pocket tester (Ω × 1) and battery
(12 V) to the fuel injection system relay terminals
as shown.
Positive battery terminal → red/black 1
Negative battery terminal → blue/yellow 2
Positive tester probe → red/blue 3
Negative tester probe → red/blue 4
3. Does the fuel injection system relay have conti-
nuity between red/blue and red/blue?
If there is a malfunction, repair it and connect it
securely.
Fuel injection system relay coupler
ECU (engine) coupler
4
R/L
3
R/L
R/L
R/B L/Y
2 1
R/L
7 - 21
FI
Reinstatement
method
Reinstated by
starting the engine
and operating it at
idle.
R/B
L/Y