Yamaha MBK MW125 2014 Service Manual page 338

Fault code No.
Item
Diagnostic code No.
Tool display
Procedure
Probable cause of malfunc-
Item
tion and check
1 The vehicle has overturned.
2 Installed condition of lean an-
gle sensor.
3 Defective lean angle sensor.
4 Malfunction in ECU.
Fault code No. 37
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Action
Procedure
Probable cause of malfunc-
Item
tion and check
1 Locate the malfunction.
30
Latch up detected.
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
Raise the vehicle upright.
Check the installed direction
and condition of the sensor.
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.
37
Engine speed is high when the engine is idling.
Able to start engine
Able to drive vehicle
54
The ISC (idle speed control) valve fully closes, and then it turn back fully
opens.
This operation takes approximately 3 seconds.
Check that ISC valve is actuated by listening for the operating sound.
Maintenance job
Execute the diagnostic mode.
(Code No. 54)
Check that ISC valve is actuat-
ed by listening for the operating
sound.
8-41
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.
Confirmation of service com-
ISC valve operation sound is
heard.→ Go to item A-1.
ISC valve operation sound is
not heard. → Go to item B-1.
pletion
pletion