Yamaha YZ450FA 2011 Owner's Service Manual page 281

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 position
is correct.
5 Defective intake air pressure sensor.
6 Malfunction in ECU.
If fault code Nos. 13 and 14 are both displayed, perform the checks and maintenance jobs for
fault code No. 13 first.
13
Intake air pressure sensor signal is not received properly.
Able to start
Able to drive
D03
Intake air pressure
Crank the engine. (If the display value changes, the performance is OK.)
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.
D03).
Displayed value is incorrect
→ Replace.
Replace the ECU.
7-19
FUEL INJECTION SYSTEM
When the engine is
stopped, displays the at-
mospheric pressure ac-
cording to the elevation
and weather.
0 m above sea level: Ap-
prox. 101 kPa
1000 m above sea level:
Approx. 90 kPa
2000 m above sea level:
Approx. 80 kPa
3000 m above sea level:
Approx. 70 kPa
Check that the value
changes while the engine
is being cranked.
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.