Yamaha YXR70FX Service Manual page 294

Fault code No. 43
Diagnostic code No. d09
Order Item/components and probable
cause
1 Connections
• Fuel injection system relay
• Main wire harness-ECU coupler
2 Open or short circuit in the wire
harness.
3 Malfunction or open circuit in fuel
pump relay.
Fault code No. 44
Diagnostic code No. d60
Order Item/components and probable
cause
1 Malfunction in ECU.
FUEL INJECTION SYSTEM
Symptom Power supply to the injector and fuel pump is not normal.
Fuel system voltage
Check or maintenance job
• Check the coupler for any pins
that may be pulled out.
• Check the locking condition of
the coupler.
• If there is a malfunction, repair it
and connect the coupler
securely.
• Repair or replace if there is an
open or short circuit.
• Between fuel injection system
relay coupler and ECU coupler.
(red/blue–red/blue)
• Between fuel injection system
relay coupler and starter relay
coupler.
(brown/black–brown/black)
• Execute the diagnostic mode.
(Code No.d09)
• Replace if defective.
• If there is no malfunction in the
fuel injection system relay,
replace the ECU.
Symptom Error is detected while reading or writing on EEPROM
(CO adjustment value).
EEPROM improper cylinder indication
Check or maintenance job
• Execute the diagnostic mode.
(Code No.d60)
• Replace ECU if defective.
6 - 24
FI
Reinstatement
method
Starting the
engine and
operating it at
idle.
Reinstatement
method
Turning the
main switch to
"ON".