Yamaha Wolverine YX70EPNG, Service Manual

Page: 423 / 503

FUEL INJECTION SYSTEM
9-48
Fault code No. 22
TIP
If fault code numbers “22” and “37” are both indicated, take the actions specified for fault code number
“22” first.
1 Connection of coolant tempera-
ture sensor coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins). Improperly connected
→
Con-
nect the coupler securely or re-
place the wire harness.
Turn the main switch to “ ”
(on).
Fault code number is not dis-
played
→
Service is finished.
Fault code number is displayed
→
Go to item 2.
2 Connection of ECU coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins). Improperly connected
→
Con-
nect the coupler securely or re-
place the wire harness.
Turn the main switch to “ ”
(on).
Fault code number is not dis-
played
→
Service is finished.
Fault code number is displayed
→
Go to item 3.
3 Wire harness continuity. Open or short circuit
→
Replace
the wire harness.
Between coolant temperature
sensor coupler and ECU cou-
pler.
green/yellow–green/yellow
Between coolant temperature
sensor coupler and joint cou-
pler.
black/blue–black/blue
Between joint coupler and ECU
coupler.
black/blue–black/blue
Turn the main switch to “ ”
(on).
Fault code number is not dis-
played
→
Service is finished.
Fault code number is displayed
→
Go to item 4.
4 Installed condition of coolant
temperature sensor.
Check for looseness or pinch-
ing. Improperly installed sensor
→
Reinstall or replace the sensor.
Turn the main switch to “ ”
(on).
Fault code number is not dis-
played
→
Service is finished.
Fault code number is displayed
→
Go to item 5.
5 Defective coolant temperature
sensor. Execute the diagnostic mode.
(Code No. 06)
When engine is cold:
Displayed temperature is close
to the ambient temperature.
The displayed temperature is
not close to the ambient tem-
perature
→
Check the coolant
temperature sensor.
Replace if defective.
Refer to “CHECKING THE
COOLANT TEMPERATURE
SENSOR” on page 9-106.
Turn the main switch to “ ”
(on).
Fault code number is not dis-
played
→
Service is finished.
Fault code number is displayed
→
Go to item 6.
6 Malfunction in ECU. Replace the ECU.
Fault code No. 21
Item Coolant temperature sensor: open or short circuit detected.