Yamaha MBK XMAX 2014, Service Manual

Page: 366 / 482

FUEL INJECTION SYSTEM
8-53
3 Wire harness continuity. Open or short circuit
→
Re-
place the wire harness.
Between coolant tempera-
ture sensor coupler and ECU
coupler.
green/red–green/red
black/blue–black/blue
Turn the main switch to “ON”.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is dis-
played
→
Go to item 4.
4 Installed condition of coolant
temperature sensor.
Check for looseness or
pinching. 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 dis-
played
→
Go to item 5.
5 Defective coolant tempera-
ture sensor. Execute the diagnostic
mode. (Code No. D06)
When engine is cold:
Displayed temperature is
close to the ambient temper-
ature.
The displayed temperature is
not close to the ambient tem-
perature
→
Check the cool-
ant temperature sensor.
Replace if defective.
Refer to “CHECKING THE
COOLANT TEMPERATURE
SENSOR” on page 8-147.
Turn the main switch to “ON”.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is dis-
played
→
Go to item 6.
6 Malfunction in ECU. Replace the ECU.
Fault code No. 22
Item Intake air temperature sensor: open or short circuit detected.
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. D05
FI diagnostic tool display Displays the intake air temperature.
Procedure
Compare the actually measured air temperature with the FI diag-
nostic tool display value.
Item
Probable cause of mal-
function and check
Maintenance job
Confirmation of service
completion
1 Connection of intake air tem-
perature sensor 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.
Turn the main switch to “ON”.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is dis-
played
→
Go to item 2.
Fault code No. 21
Item Coolant temperature sensor: open or short circuit detected.