Yamaha RS90GTZ Service Manual page 354

Fault code No. 43
Diagnostic code No. d:09 (fuel system voltage)
Item/components and probable cause
Order
Connections
• Fuel injection system relay coupler
1 • Wire harness ECU coupler
Open or short circuit in wire harness.
2
Malfunction or open circuit in fuel injection
system relay.
3
4 Malfunction in ECU.
FUEL INJECTION SYSTEM
Symptom Power supply to the fuel injectors and fuel pump is not normal.
Check or maintenance job
Check the couplers for any pins that may have
pulled out.
Check the locking condition of the couplers.
If there is a malfunction, repair it and connect the
coupler securely.
Repair or replace if there is an open or short circuit.
Between the fuel injection system relay coupler and
ECU coupler.
Blue/Red – Blue/Red
Between the fuel injection system relay coupler and
engine stop switch coupler.
Red/White – Red/White
Between the engine stop switch coupler and main
switch coupler.
Brown – Brown
Execute the diagnostic mode (code No. d:09).
Replace if defective.
TIP
• Refer to diagnostic mode (code No. d:50).
• When the leads are disconnected, the voltage
check by the code No. d:09 is impossible.
1. Disconnect the fuel injection system relay from
the wire harness and remove it.
2. Connect the pocket tester (Ω × 1) and battery
(12 V) to the fuel injection system relay terminals
as shown.
Positive battery terminal → Red/White
Negative battery terminal → Blue/Red
Positive tester probe → Red/Green
Negative tester probe → Red/Blue
3. Does the fuel injection system relay have conti-
nuity between the red/green and red/blue termi-
nals?
Replace the ECU.
7-27
FI
Reinstate-
ment method
Setting the
engine stop
switch to
"RUN" and
turning the
main switch
on.