Yamaha YZ450FA 2011 Owner's Service Manual page 284

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
4 Installed condition of sensor.
• Make sure that the installation posi-
tion is correct.
• Make sure that there are no problems
with the installation.
5 Applied voltage of throttle position sen-
sor lead
6 Defective throttle position sensor.
7 alfunction in ECU.
15
Throttle position sensor signal is not received properly.
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.
Measure the output voltage.
Refer to "CHECKING THE
THROTTLE POSITION
SENSOR".
Open circuit
item
Ground wire
open circuit
Output wire
open circuit
Power sup-
ply wire open
circuit
Execute the diagnostic
mode (diagnostic code No.
D01).
Displayed value is out of
specification → Replace.
Replace the ECU.
7-22
FUEL INJECTION SYSTEM
Applied volt-
age
5 V
0 V
0 V
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 check the
fault code display.
Fault code number
is not displayed →
Service is finished.
Fault code number
is displayed → Re-
fer to item 5.
Set the switch on the
FI diagnostic tool sub-
wire harness to "ON",
and then check the
fault code display.
Fault code number
is not displayed →
Service is finished.
Fault code number
is displayed → Re-
fer to item 6.
Set the switch on the
FI diagnostic tool sub-
wire harness to "ON",
and then check the
fault code display.
Fault code number
is not displayed →
Service is finished.
Fault code number
is displayed → Re-
fer to item 7.