Yamaha XVS950CU 2014, Service Manual, Page: 448 / 580

FUEL INJECTION SYSTEM
7-57
3 Connection of 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 secure-
ly or replace the wire har-
ness.
Start the engine, warm it up,
and then race it, or execute
the diagnostic mode. (Code
No. 63)
Fault code number is not dis-
played
→
Service is finished.
Fault code number is dis-
played
→
Go to item 4.
4 Wire harness continuity. Open or short circuit
→
Re-
place the wire harness.
Between O
2
sensor coupler
and ECU coupler.
gray/white–gray/white
gray/green–gray/green
Between O
2
sensor coupler
and joint coupler.
red/white–red/white
black/blue–black/blue
Between joint coupler and
ECU coupler.
black/blue–black/blue
red/white–red/white
Start the engine, warm it up,
and then race it, or execute
the diagnostic mode. (Code
No. 63)
Fault code number is not dis-
played
→
Service is finished.
Fault code number is dis-
played
→
Go to item 5.
5 Check fuel pressure. Refer to “CHECKING THE
PRESSURE REGULATOR
OPERATION” on page 6-9. Start the engine, warm it up,
and then race it, or execute
the diagnostic mode. (Code
No. 63)
Fault code number is not dis-
played
→
Service is finished.
Fault code number is dis-
played
→
Go to item 6.
6 Defective O
2
sensor. Check the O
2
sensor.
Replace if defective.
Refer to “ENGINE REMOV-
AL” on page 5-3.
Start the engine, warm it up,
and then race it, or execute
the diagnostic mode. (Code
No. 63)
Fault code number is not dis-
played
→
Service is finished.
Fault code number is dis-
played
→
Go to item 7.
7 Malfunction in ECU. Replace the ECU.
Fault code No. 28
Item Engine temperature sensor: open or short circuit detected.
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. 11
Indicated Displays the engine temperature.
Procedure
Make sure that the display is close to the ambient temperature
during cold starting.
Fault code No. 24
Item
O
2
sensor: no normal signals are received from the O
2
sensor.