Yamaha YZ 2017 Series, Owner'S Service Manual

Page: 351 / 410

FUEL INJECTION SYSTEM
8-47
Fault code No. 46
Item Charging voltage is abnormal.
Fail-safe system Able/Unable to start engine
Able/Unable to drive vehicle
Diagnostic code No. —
Diagnostic tool display —
Procedure —
Item Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service
completion
1 Connection of wire harness
ECU coupler.
Check the locking condition
of the coupler.
Disconnect the coupler and
check the pins (bent or bro-
ken terminals and locking
condition of the pins).
Improperly connected

Connect the coupler securely
or repair/replace the wire har-
ness.
Start the engine and let it idle
for approximately 5 seconds.
Fault code number is not dis-
played

Service is finished.
Fault code number is dis-
played

Go to item 2.
2 Wire harness continuity. Open or short circuit

Re-
place the wire harness.
Between rectifier/regulator
coupler and ECU coupler.
red–red
Between battery terminal and
ECU coupler.
red–red
Start the engine and let it idle
for approximately 5 seconds.
Fault code number is not dis-
played

Service is finished.
Fault code number is dis-
played

Go to item 3.
3 Defective AC magneto. Check the AC magneto.
Refer to “CHARGING SYS-
TEM” on page 8-12.
Defective AC magneto

Re-
place.
Start the engine and let it idle
for approximately 5 seconds.
Fault code number is not dis-
played

Service is finished.
Fault code number is dis-
played

Go to item 4.
4 Malfunction in ECU. Replace the ECU.