Yamaha YFM70RY Service Manual page 338

Fault code No. 43
Diagnostic code No.
Order Item/components and probable
cause
1 Connections
• Relay unit coupler (fuel pump relay)
• Main wire harness-ECU coupler
2 Open or short circuit in the wire har-
ness.
3 Malfunction or open circuit in fuel in-
jection system relay
Fault code No. 44
Diagnostic code No.
Order Item/components and probable
cause
1 Malfunction in ECU.
Symptom Power supply to the fuel injector and fuel pump is not nor-
mal.
d09 Fuel system voltage
Symptom Error is detected while reading or writing on EEPROM (CO
adjustment value).
d60 EEPROM improper cylinder indication
FUEL INJECTION SYSTEM
Check or maintenance job
• Check the coupler for any pins
that may have pulled out.
• Check the locking condition of
the coupler.
• If there is a malfunction, repair it
and connect the coupler se-
curely.
• Repair or replace if there is an
open or short circuit.
• Between relay unit coupler and
ECU coupler.
(blue/red–blue/red)
(red/blue–red/blue)
• Between relay unit coupler and
battery terminal.
(brown/green–red)
• Between relay unit coupler and
handlebar switch coupler.
(red/black–red/black)
• Execute the diagnostic mode.
(Code No. d09)
• Replace if defective.
• If there is no malfunction with
the fuel injection system relay,
replace the ECU.
Check or maintenance job
• Execute the diagnostic mode.
(Code No. d60)
• Replace the ECU if defective.
8-49
Reinstatement
method
Starting the en-
gine and oper-
ating it at idle.
Reinstatement
method
Turning the
main switch to
"ON".