Yamaha MBK MW125 2014 Service Manual page 332

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 throttle
body sensor assembly.
Check for looseness or pinch-
ing.
5 Defective throttle position sen-
sor.
6 Malfunction in ECU.
Fault code No. 16
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
Procedure
Probable cause of malfunc-
Item
tion and check
15
Throttle position sensor: open or short circuit detected.
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Open or short circuit → Replace
the wire harness.
Between throttle body sensor
assembly coupler and ECU
coupler.
black/blue–black/blue
yellow–yellow
blue–blue
Improperly installed sensor →
Reinstall sensor.
Check throttle position sensor
signal.
Execute the diagnostic mode.
(Code No. 01)
When the throttle valve is fully
closed:
A value of 14–20 is indicated.
When throttle valve is fully
open:
A value of 97–107 is indicated.
An indicated value is out of the
specified range → Replace the
throttle body.
Replace the ECU.
Refer to "REPLACING THE
ECU (engine control unit)" on
page 8-59.
16
Throttle position sensor is stuck.
Able to start engine
Able to drive vehicle
01
Throttle position sensor signal
• 14–20 (Fully closed position)
• 97–107 (Fully open position)
• Check with throttle valve fully closed.
• Check with throttle valve fully open.
Maintenance job
8-35
FUEL INJECTION SYSTEM
Turn the main switch 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".
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".
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 5.
Turn the main switch to "ON".
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 6.
Confirmation of service com-
pletion