Yamaha YZ450FA 2011 Owner's Service Manual page 285

Fault code No.
Symptom
Fail-safe system
Diagnostic code No.
FI diagnostic tool dis-
play
Checking method
Item Item/components and probable cause Check or maintenance job
1 Installed condition of sensor.
• Make sure that the installation posi-
tion is correct.
• Make sure that there are no problems
with the installation.
2 Defective throttle position sensor.
3 Malfunction in ECU.
Make sure that the engine is completely cool before checking the coolant temperature sensor.
16
Signal from throttle position sensor does not change.
Able to start
Able to drive
D01
• 15 – 19° (Fully closed position)
• 95 – 101° (Fully opened position)
• Check with throttle valves fully closed.
• Check with throttle valves fully open.
Check that the sensor is in-
stalled securely and that
there are no pinched
leads.Check that the ECU is
installed securely and that
there are no pinched leads.
Incorrect installation → Re-
install or repair.
Incorrect installation posi-
tion → Properly install.
Execute the diagnostic
mode (diagnostic code No.
D01).
Displayed value is out of
specification → Replace.
Replace the ECU.
7-23
FUEL INJECTION SYSTEM
When throttle is fully
closed: A value of 15–19
is indicated.
When throttle is fully
opened: A value of
95–101 is indicated.
Checking method
Set the switch on the
FI diagnostic tool sub-
wire harness to "ON",
and then operate the
throttle.
After completing the
above operation,
check whether a fault
code number is dis-
played.
Fault code number
is not displayed →
Service is finished.
Fault code number
is displayed → Re-
fer to item 2.
Set the switch on the
FI diagnostic tool sub-
wire harness to "ON",
and then operate the
throttle.
After completing the
above operation,
check whether a fault
code number is dis-
played.
Fault code number
is not displayed →
Service is finished.
Fault code number
is displayed → Re-
fer to item 3.