Yamaha MBK MW125 2014 Service Manual page 342

Fault code No. 41
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
Procedure
Probable cause of malfunc-
Item
tion and check
1 Connection of lean angle sen-
sor 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 Defective lean angle sensor.
5 Malfunction in ECU.
Fault code No. 42
Fault code No.
Item
Fail-safe system
41
Lean angle sensor: open or short circuit detected.
Unable to start engine
Unable to drive vehicle
08
Lean angle sensor output voltage
• 0.4–1.4 (upright)
• 3.7–4.4 (overturned)
Remove the lean angle sensor and incline it more than 50 degrees.
Maintenance job
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 lean angle sensor
coupler and ECU coupler.
yellow/green–yellow/green
blue–blue
black/blue–black/blue
Execute the diagnostic mode.
(Code No. 08)
Replace if defective.
Refer to "CHECKING THE
LEAN ANGLE SENSOR" on
page 8-65.
Replace the ECU.
Refer to "REPLACING THE
ECU (engine control unit)" on
page 8-59.
42
Speed sensor: no normal signals are received from the speed sen-
sor.
Able to start engine
Able to drive vehicle
8-45
FUEL INJECTION SYSTEM
Confirmation of service com-
Turn the main switch to "ON",
then to "OFF", and then back 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",
then to "OFF", and then back 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",
then to "OFF", and then back 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",
then to "OFF", and then back to
"ON".
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 5.
pletion