Yamaha YZ 2018 Series, Owner'S Service Manual

Page: 333 / 402

FUEL INJECTION SYSTEM
8-34
TIP
Before troubleshooting, disconnect the starter motor lead from the starter relay.
6 Defective throttle position
sensor. Check throttle position sen-
sor signal.
Execute the diagnostic mode.
(Code No. 01)
When the throttle valve is fully
closed:
A value of 11–14 is indicated.
When throttle valve is fully
open:
A value of 109–116 is indicat-
ed.
An indicated value is out of
the specified range.

Re-
place the throttle position
sensor.
Push the start switch.
Fault code number is not dis-
played

Service is finished.
Fault code number is dis-
played

Go to item 7.
7 Malfunction in ECU. Replace the ECU.
Fault code No. 16
Item
Throttle position sensor: stuck throttle position sensor is de-
tected.
Fail-safe system Able to start engine
Able to drive vehicle
Diagnostic code No. 01
Diagnostic tool display Throttle position sensor signal
• 11–14 (fully closed position)
• 109–116 (fully open position)
Procedure • Check with throttle valve fully closed.
• Check with throttle valve fully open.
Item
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service
completion
1 Installed condition of throttle
position sensor.
Check for looseness or
pinching. Improperly installed sensor

Reinstall or replace the
sensor.
Refer to “ADJUSTING THE
THROTTLE POSITION SEN-
SOR” on page 7-10.
Push the start switch.
Fault code number is not dis-
played

Service is finished.
Fault code number is dis-
played

Go to item 2.
Fault code No. 15
Item Throttle position sensor: open or short circuit detected.