Yamaha YZ450FX 2019, Owner'S Service Manual

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FUEL INJECTION SYSTEM
8-33
Fault code No. 16
TIP
If fault code numbers 15 and 16 are both displayed, perform checkup and repair jobs for fault code num-
ber 15 first.
5 Applied voltage of throttle posi-
tion sensor lead.
Check the applied voltage.
(black/blue–blue)
Start switch to ON (main relay
ON), and then check the condi-
tion of the fault code using the
malfunction mode of the
Yamaha diagnostic tool.
Condition is “Recovered”

Go
to item 8 and finish the service.
Condition is “Detected”

Go to
item 6.
Location of discon-
nected lead
Output
voltage
Disconnected
ground lead
5 V
Disconnected output
lead
0 V
Disconnected power
supply lead
0 V
6 Defective throttle position sen-
sor.
Execute the diagnostic mode.
(Code No. 01)
When the throttle is fully closed,
11–14 displays.
When the throttle is fully
opened, 86–92 displays.
Incorrect display range

Replace the throttle position
sensor.
Disconnect the starter relay
lead (to the starter motor), and
then push the starter switch.
Start switch to ON (main relay
ON), and then check the condi-
tion of the fault code using the
malfunction mode of the
Yamaha diagnostic tool.
Condition is “Recovered”

Go
to item 8 and finish the service.
Condition is “Detected”

Go to
item 7.
7 Faulty ECU. Replace the ECU. Service is finished.
8 Delete the fault code. Confirm that the fault code has
a condition of “Recovered”
using the Yamaha diagnostic
tool, and then delete the fault
code.
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
Displays the throttle angle.
• 11–14 (throttle in fully closed position)
• 86–92 (throttle in fully opened position)
Procedure
• Check with throttle fully closed.
• Check with throttle fully opened.
Item
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service com-
pletion
Fault code No. 15
Item Throttle position sensor: open or short circuit detected.