Yamaha YFM7FGPW Service Manual page 297

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 wire har-
ness.
Fault code No. 50
Diagnostic code No. —
Order Item/components and probable
cause
1 Malfunction in ECU.
FUEL INJECTION SYSTEM
Symptom Power supply is not normal.
—
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.
• Replace or charge the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" in
chapter 3.
• Replace if defective.
Refer to "CHARGING SYSTEM"
in chapter 9.
• Repair or replace if there is an
open or short circuit.
• Between battery lead and main
switch coupler
(red–red)
• Between main switch coupler
and ignition fuse
(brown/blue–brown/blue)
• Between ignition fuse and ECU
coupler
(brown–brown)
Symptom Faulty ECU memory. (When this malfunction is detected
in the ECU, the fault code number might not appear on
the meter.)
—
Check or maintenance job
Replace the ECU.
NOTE:
Do not perform this procedure with
the main switch turned to "ON".
6 - 25
FI
Reinstatement
method
Starting the
engine and
operating it at
idle.
Reinstatement
method
Turning the
main switch to
"ON".