Yamaha MBK XMAX 2014, Service Manual

Page: 361 / 482

FUEL INJECTION SYSTEM
8-48
Item
Probable cause of mal-
function and check
Maintenance job
Confirmation of service
completion
1 Condition of intake air pres-
sure sensor hose.
Check the intake air pressure
sensor hose condition. Clogged or detached hose
→
Repair or replace the sen-
sor hose.
Start the engine and let it idle
for approximately 5 seconds.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is dis-
played
→
Go to item 2.
2 Defective intake air pressure
sensor. Execute the diagnostic
mode. (Code No. D03)
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
level: Approx. 90 kPa (675.1
mmHg, 26.6 inHg)
2000 m (6700 ft) above sea
level: Approx. 80 kPa (600.0
mmHg, 23.6 inHg)
3000 m (9800 ft) above sea
level: 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 if defective.
Refer to “CHECKING THE
INTAKE AIR PRESSURE
SENSOR” on page 8-148.
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. D01
FI diagnostic tool display
Throttle position sensor signal
• 8–22 (fully closed position)
• 88–102 (fully open position)
Procedure
• Check with throttle valve fully closed.
• Check with throttle valve fully open.
Fault code No. 14
Item
Intake air pressure sensor: hose system malfunction (clogged
or detached hose).