Yamaha YFM70RY Service Manual page 339

Fault code No. 46
Diagnostic code No.
Order Item/components and probable
cause
1 Connections
• Main wire harness-ECU coupler
2 Faulty battery.
3 Malfunction in rectifier/regulator.
4 Open or short circuit in the wire har-
ness.
Fault code No. 50
Diagnostic code No.
Order Item/components and probable
cause
1 Malfunction in ECU
Symptom Power supply to the fuel injection system is not normal.
— —
Symptom Faulty ECU memory. (When this malfunction is detected in
the ECU, the fault code number might not appear on the
meter.)
— —
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.
• Replace or charge the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 8-62.
• Replace if defective.
Refer to "CHARGING SYS-
TEM" on page 8-11.
• Repair or replace if there is an
open or short circuit.
• Between battery and main
switch coupler
(red–red)
• Between main switch coupler
and ignition fuse
(brown–brown)
• Between ignition fuse and ECU
coupler
(brown–brown)
Check or maintenance job
Replace the ECU.
TIP
Do not perform this procedure
with the main switch turned to
"ON".
8-50
Reinstatement
method
Starting the en-
gine and oper-
ating it at idle.
Reinstatement
method
Turning the
main switch to
"ON".