Yamaha MBK XMAX 2014 Service Manual page 363

Fault code No.
Item
5 Defective crankshaft posi-
tion sensor.
6 Malfunction in ECU.
Fault code No.
Item
Fail-safe system
Diagnostic code No.
FI diagnostic tool display
Procedure
Probable cause of mal-
Item
function and check
1 Connection of intake air
pressure 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).
2 Connection of wire harness
ECU 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).
3 Wire harness continuity.
12
Crankshaft position sensor: no normal signals are received
from the crankshaft position sensor.
Check the crankshaft posi-
tion sensor.
Refer to "CHECKING THE
CRANKSHAFT POSITION
SENSOR" on page 8-143.
Replace if defective.
Replace the ECU.
13
Intake air pressure sensor: open or short circuit detected.
Able to start engine
Able to drive vehicle
D03
Displays the intake air pressure.
Operate the throttle while pulling the brake lever and pushing the
start switch " ". (If the display value changes, the performance is
OK.)
Maintenance job
Improperly connected →
Connect the coupler secure-
ly or replace the wire har-
ness.
Improperly connected →
Connect the coupler secure-
ly or replace the wire har-
ness.
Open or short circuit → Re-
place the wire harness.
Between intake air pressure
sensor coupler and ECU
coupler.
pink/white–pink/white
blue–blue
black/blue–black/blue
8-46
FUEL INJECTION SYSTEM
Crank the engine.
Fault code number is not dis-
played → Service is finished.
Fault code number is dis-
played → Go to item 6.
Confirmation of service
completion
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.
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 3.
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.