Yamaha MBK MW125 2014, Service Manual

Page: 331 / 380

FUEL INJECTION SYSTEM
8-34
Fault code No. 15
2 Defective intake air pressure
sensor. Execute the diagnostic mode.
(Code No. 03)
When engine is stopped:
Atmospheric pressure at the
current altitude and weather
conditions is indicated.
At sea level: Approx. 101 kPa
(757.6 mmHg, 29.8 inHg)
1000 m (3300 ft) above sea lev-
el: Approx. 90 kPa (675.1
mmHg, 26.6 inHg)
2000 m (6700 ft) above sea lev-
el: Approx. 80 kPa (600.0
mmHg, 23.6 inHg)
3000 m (9800 ft) above sea lev-
el: Approx. 70 kPa (525.0
mmHg, 20.7 inHg)
When engine is cranking: Make
sure that the indication value
changes.
The value does not change
when engine is cranking.
→
Check the intake air pressure
sensor.
Replace the throttle body, if de-
fective.
Refer to “THROTTLE BODY” on
page 7-7.
Fault code No. 14
Item
Intake air pressure sensor: system malfunction (clogged or de-
tached).
Fault code No. 15
Item Throttle position sensor: open or short circuit detected.
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. 01
01
Tool display
Throttle position sensor signal
• 14–20 (fully closed position)
• 97–107 (fully open position)
Procedure
• Check with throttle valve fully closed.
• Check with throttle valve fully open.
Item
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service com-
pletion
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). 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.