Yamaha YZ450FA 2011, Owner'S Service Manual

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7-19
FUEL INJECTION SYSTEM
If fault code Nos. 13 and 14 are both displayed, perform the checks and maintenance jobs for
fault code No. 13 first.
4 Installed condition of sensor.
Make sure that the installation position
is correct. 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.
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.
5 Defective intake air pressure sensor. Execute the diagnostic
mode (diagnostic code No.
D03).
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.
Displayed value is incorrect
→
Replace.
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.
6 Malfunction in ECU. Replace the ECU.
Fault code No. 13
Symptom Intake air pressure sensor signal is not received properly.
Fail-safe system Able to start
Able to drive
Diagnostic code No. D03
FI diagnostic tool dis-
play Intake air pressure
Checking method Crank the engine. (If the display value changes, the performance is OK.)
Item Item/components and probable cause Check or maintenance job Checking method