Yamaha MBK MW125 2014 Service Manual page 336

Fault code No.
Item
1 Connection of throttle body sen-
sor assembly 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).
2 Connection of wire harness
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).
3 Wire harness continuity.
4 Installed condition of throttle
body sensor assembly.
Check for looseness or pinch-
ing.
5 Defective intake air temperature
sensor.
6 Malfunction in ECU.
Fault code No. 24
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
Procedure
22
Intake air temperature sensor: open or short circuit detected.
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Open or short circuit → Replace
the wire harness.
Between throttle body sensor
assembly coupler and ECU
coupler.
brown/white–brown/white
black/blue–black/blue
Improperly installed sensor →
Reinstall the sensor or replace
the throttle body.
Execute the diagnostic mode.
(Code No. 05)
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 air tem-
perature sensor.
Replace throttle body, if defec-
tive.
Replace the ECU.
Refer to "REPLACING THE
ECU (engine control unit)" on
page 8-59.
24
O sensor: no normal signals are received from the O
2
Able to start engine
Able to drive vehicle
—
—
—
8-39
FUEL INJECTION SYSTEM
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.
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.
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.
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.
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.
sensor.
2