Yamaha YZ 2019 Series, Owner'S Service Manual

Page: 329 / 398

FUEL INJECTION SYSTEM
8-30
Fault code No. 16
TIP
Before troubleshooting, disconnect the starter motor lead from the starter relay.
Fault code No. 16
Item Throttle position sensor: stuck throttle position sensor is detected.
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 com-
pletion
1 Installed condition of throttle
position sensor.
Check for looseness or pinch-
ing.
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 displayed

Go to item 2.
2 Defective throttle position sen-
sor.
Check throttle position sensor
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 indicated.
An indicated value is out of the
specified range

Replace the
throttle position sensor.
Push the start switch.
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.