Yamaha YZ450FP 2023, Owner'S Service Manual

Page: 325 / 388

FUEL INJECTION SYSTEM
8-26
Fault code No. 16
TIP
• If fault code numbers 15 and 16 are both displayed, perform checkup and repair jobs for fault code
number 15 first.
• Before troubleshooting, disconnect the starter motor lead from the starter relay.
5 Applied voltage of throttle posi-
tion sensor lead.
Check the applied voltage.
(black–blue)
Start switch to ON (no need to
start the engine), and then
check the condition 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)
Correct display range:
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, and then reset the ECU
using the diagnostic code num-
ber “87”.
Refer to “DIAGNOSTIC CODE:
SENSOR OPERATION TABLE”
on page 9-12.
Start switch to ON (no need to
start the engine), and then
check the condition 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.