Yamaha MBK MW125 2014, Service Manual

Page: 333 / 380

FUEL INJECTION SYSTEM
8-36
Fault code No. 19
1 Installed condition of throttle po-
sition sensor. Check for looseness or pinch-
ing.
Make sure that the mounting
position is corrected. Turn the main switch to “ON”
and operate the throttle valve
open and close.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is displayed
→
Go to item 2.
2 Defective throttle position sen-
sor. Execute the diagnostic mode.
(Code No. 01)
When the throttle valve is fully
closed:
A value of 14–20 is indicated.
When the throttle valve is fully
open:
A value of 97–107 is indicated.
Replace the throttle body, if de-
fective. Turn the main switch to “ON”
and operate the throttle valve
open and close.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is displayed
→
Go to item 3.
3 Malfunction in ECU Replace the ECU.
Refer to “REPLACING THE
ECU (engine control unit)” on
page 8-59.
Fault code No. 16
Item Throttle position sensor is stuck.
Fault code No. 19
Item
Sidestand switch: a break or disconnection of the blue/yellow lead of
the ECU is detected.
Fail-safe system
Unable to start engine
Unable to drive vehicle
Diagnostic code No. 20
Tool display
Sidestand switch
• “ON” (sidestand retracted)
• “OFF” (sidestand extended)
Procedure Extend and retract the sidestand (with the transmission in gear).
Item
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service com-
pletion
1 Connection of sidestand switch
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). Improperly connected
→
Con-
nect the coupler securely or re-
place the wire harness.
Turn the main switch to “ON”,
and then extend and retract the
sidestand.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is displayed
→
Go to item 2.
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). Improperly connected
→
Con-
nect the coupler securely or re-
place the wire harness.
Turn the main switch to “ON”,
and then extend and retract the
sidestand.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is displayed
→
Go to item 3.