Yamaha YZ450FP 2023, Owner'S Service Manual

Page: 329 / 388

FUEL INJECTION SYSTEM
8-30
Fault code No. 30
TIP
• If fault code numbers 8, 15, 16, and 30 are displayed, perform checkup and repair jobs for fault code
number 8, 15, or 16 first.
• Before troubleshooting, disconnect the starter motor lead from the starter relay.
4 Mounted condition of intake air
temperature sensor.
Check for looseness or pinch-
ing.
Check the mounted position for
correctness.
Improperly mounted sensor

Remount or replace the sensor.
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 7 and finish the service.
Condition is “Detected”

Go to
item 5.
5 Defective intake air tempera-
ture sensor.
Execute the diagnostic mode.
(Code No. 05)
Proper display:
When the machine is cold, dis-
played temperature is close to
the ambient temperature.
Improper display

Replace the
intake air temperature sensor.
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 7 and finish the service.
Condition is “Detected”

Go to
item 6.
6 Faulty ECU. Replace the ECU. Service is finished.
7 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. 30
Item The vehicle has overturned.
Fail-safe system
Unable to start engine
Unable to drive vehicle
Diagnostic code No.
08
Diagnostic tool display
Displays the lean angle sensor output voltage.
•
0.4–1.4 (V) (upright)
•
3.7–4.4 (V) (overturned)
Procedure
Remove the ECU, and incline it 45

or more.
Item
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service com-
pletion
Fault code No. 22
Item Intake air temperature sensor: open or short circuit detected.