Yamaha MBK MW125 2014 Service Manual page 328

Fault code No.
Item
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 crank-
shaft position sensor.
Check for looseness or pinch-
ing.
Check the gap between the
crankshaft position sensor and
the pickup rotor.
5 Defective crankshaft position
sensor.
6 Malfunction in ECU.
Fault code No. 13
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
Procedure
Probable cause of malfunc-
Item
tion and check
12
Crankshaft position sensor: no normal signals are received from the
crankshaft position sensor.
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Open or short circuit → Replace
the wire harness.
Between crankshaft position
sensor coupler and ECU cou-
pler.
white/red–white/red
black/blue–black/blue
Improperly installed sensor →
Reinstall or replace the sensor.
Refer to "AC MAGNETO" on
page 5-49.
Check the crankshaft position
sensor.
Refer to "CHECKING THE
CRANKSHAFT POSITION
SENSOR" on page 8-64.
Replace the stator assembly, if
defective.
Replace the ECU.
Refer to "REPLACING THE
ECU (engine control unit)" on
page 8-59.
13
Intake air pressure sensor: open or short circuit detected.
Able to start engine
Able to drive vehicle
03
Displays the intake air pressure.
Extend the sidestand, and then operate the throttle while pushing the
start switch. (If the display value changes, the performance is OK.)
Maintenance job
8-31
FUEL INJECTION SYSTEM
Crank the engine.
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 3.
Crank the engine.
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 4.
Crank the engine.
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 5.
Crank the engine.
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 6.
Confirmation of service com-
pletion